date

(PHP 4, PHP 5, PHP 7)

dateФорматирует вывод системной даты/времени

Описание

string date ( string $format [, int $timestamp = time() ] )

Возвращает строку, отформатированную в соответствии с указанным шаблоном format. Используется метка времени, заданная аргументом timestamp, или текущее системное время, если timestamp не задан. Таким образом, timestamp является необязательным и по умолчанию равен значению, возвращаемому функцией time().

Список параметров

format

Шаблон результирующей строки (string) с датой. См. параметры форматирования ниже. Также существует несколько предопределенных констант даты/времени, которые могут быть использованы вместо этих параметров. Например: DATE_RSS заменяет шаблон 'D, d M Y H:i:s'.

В параметре format распознаются следующие символы
Символ в строке format Описание Пример возвращаемого значения
День --- ---
d День месяца, 2 цифры с ведущим нулём от 01 до 31
D Текстовое представление дня недели, 3 символа от Mon до Sun
j День месяца без ведущего нуля от 1 до 31
l (строчная 'L') Полное наименование дня недели от Sunday до Saturday
N Порядковый номер дня недели в соответствии со стандартом ISO-8601 (добавлен в версии PHP 5.1.0) от 1 (понедельник) до 7 (воскресенье)
S Английский суффикс порядкового числительного дня месяца, 2 символа st, nd, rd или th. Применяется совместно с j
w Порядковый номер дня недели от 0 (воскресенье) до 6 (суббота)
z Порядковый номер дня в году (начиная с 0) От 0 до 365
Неделя --- ---
W Порядковый номер недели года в соответствии со стандартом ISO-8601; недели начинаются с понедельника (добавлено в версии PHP 4.1.0) Например: 42 (42-я неделя года)
Месяц --- ---
F Полное наименование месяца, например January или March от January до December
m Порядковый номер месяца с ведущим нулём от 01 до 12
M Сокращенное наименование месяца, 3 символа от Jan до Dec
n Порядковый номер месяца без ведущего нуля от 1 до 12
t Количество дней в указанном месяце от 28 до 31
Год --- ---
L Признак високосного года 1, если год високосный, иначе 0.
o Номер года в соответствии со стандартом ISO-8601. Имеет то же значение, что и Y, кроме случая, когда номер недели ISO (W) принадлежит предыдущему или следующему году; тогда будет использован год этой недели. (добавлен в версии PHP 5.1.0) Примеры: 1999 или 2003
Y Порядковый номер года, 4 цифры Примеры: 1999, 2003
y Номер года, 2 цифры Примеры: 99, 03
Время --- ---
a Ante meridiem (англ. "до полудня") или Post meridiem (англ. "после полудня") в нижнем регистре am или pm
A Ante meridiem или Post meridiem в верхнем регистре AM или PM
B Время в формате Интернет-времени (альтернативной системы отсчета времени суток) от 000 до 999
g Часы в 12-часовом формате без ведущего нуля от 1 до 12
G Часы в 24-часовом формате без ведущего нуля от 0 до 23
h Часы в 12-часовом формате с ведущим нулём от 01 до 12
H Часы в 24-часовом формате с ведущим нулём от 00 до 23
i Минуты с ведущим нулём от 00 до 59
s Секунды с ведущим нулём от 00 до 59
u Микросекунды (добавлено в версии PHP 5.2.2). Учтите, что date() всегда будет возвращать 000000, т.к. она принимает целочисленный (integer) параметр, тогда как DateTime::format() поддерживает микросекунды. Например: 654321
Временная зона --- ---
e Код шкалы временной зоны(добавлен в версии PHP 5.1.0) Примеры: UTC, GMT, Atlantic/Azores
I (заглавная i) Признак летнего времени 1, если дата соответствует летнему времени, 0 в противном случае.
O Разница с временем по Гринвичу, в часах Например: +0200
P Разница с временем по Гринвичу с двоеточием между часами и минутами (добавлено в версии PHP 5.1.3) Например: +02:00
T Аббревиатура временной зоны Примеры: EST, MDT ...
Z Смещение временной зоны в секундах. Для временных зон, расположенных западнее UTC возвращаются отрицательные числа, а расположенных восточнее UTC - положительные. от -43200 до 50400
Полная дата/время --- ---
c Дата в формате стандарта ISO 8601 (добавлено в PHP 5) 2004-02-12T15:19:21+00:00
r Дата в формате » RFC 2822 Например: Thu, 21 Dec 2000 16:01:07 +0200
U Количество секунд, прошедших с начала Эпохи Unix (The Unix Epoch, 1 января 1970 00:00:00 GMT) Смотрите также time()

Любые другие символы, встреченные в строке-шаблоне, будут выведены в результирующую строку без изменений. Z всегда возвращает 0 при использовании gmdate().

Замечание:

Поскольку рассматриваемая функция принимает в качестве параметра временные метки типа integer, форматирующий символ u будет полезен только при использовании функции date_format() и пользовательских меток времени, созданных с помощью функции date_create().

timestamp

Необязательный параметр timestamp представляет собой integer метку времени, по умолчанию равную текущему локальному времени, если timestamp не указан. Другими словами, значение по умолчанию равно результату функции time().

Возвращаемые значения

Возвращает отформатированную строку с датой. При передаче нечислового значения в качестве параметра timestamp будет возвращено FALSE и вызвана ошибка уровня E_WARNING.

Ошибки

Каждый вызов к функциям даты/времени при неправильных настройках временной зоны сгенерирует ошибку уровня E_NOTICE, и/или ошибку уровня E_STRICT или E_WARNING при использовании системных настроек или переменной окружения TZ. Смотрите также date_default_timezone_set()

Список изменений

Версия Описание
5.1.0 Допустимым диапазоном дат для временных меток обычно являются даты с 13 декабря 1901, 20:45:54 GMT по 19 января 2038, 03:14:07 GMT. (Они соответствуют минимальному и максимальному значению 32-битного целого числа со знаком). Однако для PHP версии ниже 5.1.0 в некоторых операционных системах (например, Windows) этот диапазон был ограничен датами 01-01-1970 до 19-01-2038.
5.1.0

Теперь ошибки, связанные с временными зонами, генерируют ошибки уровня E_STRICT и E_NOTICE.

5.1.1 Для стандартных форматов даты/времени существуют специальные константы, которые могут быть указаны в качестве параметра format.

Примеры

Пример #1 Примеры использования функции date()

<?php
// установка временной зоны по умолчанию. Доступно начиная с версии PHP 5.1
date_default_timezone_set('UTC');


// выведет примерно следующее: Monday
echo date("l");

// выведет примерно следующее: Monday 8th of August 2005 03:12:46 PM
echo date('l jS \of F Y h:i:s A');

// выведет: July 1, 2000 is on a Saturday
echo "July 1, 2000 is on a " date("l"mktime(000712000));

/* пример использования константы в качестве форматирующего параметра */
// выведет примерно следующее: Wed, 25 Sep 2013 15:28:57 -0700
echo date(DATE_RFC2822);

// выведет примерно следующее: 2000-07-01T00:00:00+00:00
echo date(DATE_ATOMmktime(000712000));
?>

Чтобы запретить распознавание символа как форматирующего, следует экранировать его с помощью обратного слеша. Если экранированный символ также является форматирующей последовательностью, то следует экранировать его повторно.

Пример #2 Экранирование символов в функции date()

<?php
// выведет примерно следующее: Wednesday the 15th
echo date('l \t\h\e jS');
?>

Для вывода прошедших и будущих дат удобно использовать функции date() и mktime().

Пример #3 Пример совместного использования функций date() и mktime()

<?php
$tomorrow  
mktime(000date("m")  , date("d")+1date("Y"));
$lastmonth mktime(000date("m")-1date("d"),   date("Y"));
$nextyear  mktime(000date("m"),   date("d"),   date("Y")+1);
?>

Замечание:

Данный способ более надежен, чем простое вычитание и прибавление секунд к метке времени, поскольку позволяет при необходимости гибко осуществить переход на летнее/зимнее время.

Ещё несколько примеров использования функции date(). Важно отметить, что следует экранировать все символы, которые необходимо оставить без изменений. Это справедливо и для тех символов, которые в текущей версии PHP не распознаются как форматирующие, поскольку это может быть введено в следующих версиях. Для экранировании управляющих последовательностей (например, \n) следует использовать одинарные кавычки.

Пример #4 Форматирование с использованием date()

<?php
// Предположим, что текущей датой является 10 марта 2001, 5:16:18 вечера,
// и мы находимся во временной зоне Mountain Standard Time (MST)

$today date("F j, Y, g:i a");                 // March 10, 2001, 5:16 pm
$today date("m.d.y");                         // 03.10.01
$today date("j, n, Y");                       // 10, 3, 2001
$today date("Ymd");                           // 20010310
$today date('h-i-s, j-m-y, it is w Day');     // 05-16-18, 10-03-01, 1631 1618 6 Satpm01
$today date('\i\t \i\s \t\h\e jS \d\a\y.');   // it is the 10th day.
$today date("D M j G:i:s T Y");               // Sat Mar 10 17:16:18 MST 2001
$today date('H:m:s \m \i\s\ \m\o\n\t\h');     // 17:03:18 m is month
$today date("H:i:s");                         // 17:16:18
$today date("Y-m-d H:i:s");                   // 2001-03-10 17:16:18 (формат MySQL DATETIME)
?>

Для форматирования дат на других языках используйте вместо date() функции setlocale() и strftime().

Примечания

Замечание:

Для получения метки времени из строкового представления даты можно воспользоваться функцией strtotime(). Кроме того, некоторые базы данных имеют собственные функции для преобразования внутреннего представления даты в метку времени (например, функция MySQL » UNIX_TIMESTAMP).

Подсказка

Начиная с версии PHP 5.1, временную метку начала запроса можно получить из поля $_SERVER['REQUEST_TIME'].

Смотрите также

  • gmdate() - Форматирует дату/время по Гринвичу
  • idate() - Преобразует локальное время/дату в целое число
  • getdate() - Возвращает информацию о дате/времени
  • getlastmod() - Определение времени последней модификации страницы
  • mktime() - Возвращает метку времени Unix для заданной даты
  • strftime() - Форматирует текущую дату/время с учетом текущих настроек локали
  • time() - Возвращает текущую метку времени Unix
  • strtotime() - Преобразует текстовое представление даты на английском языке в метку времени Unix
  • Предопределенные константы даты и времени

add a note add a note

User Contributed Notes 53 notes

up
109
Jimmy
4 years ago
Things to be aware of when using week numbers with years.

<?php
echo date("YW", strtotime("2011-01-07")); // gives 201101
echo date("YW", strtotime("2011-12-31")); // gives 201152
echo date("YW", strtotime("2011-01-01")); // gives 201152 too
?>

BUT

<?php
echo date("oW", strtotime("2011-01-07")); // gives 201101
echo date("oW", strtotime("2011-12-31")); // gives 201152
echo date("oW", strtotime("2011-01-01")); // gives 201052 (Year is different than previous example)
?>

Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year

Conclusion:
if using 'W' for the week number use 'o' for the year.
up
24
ivijan dot stefan at gmail dot com
1 year ago
If you have a problem with the different time zone, this is the solution for that.
<?php
// first line of PHP
$defaultTimeZone='UTC';
if(
date_default_timezone_get()!=$defaultTimeZone)) date_default_timezone_set($defaultTimeZone);

// somewhere in the code
function _date($format="r", $timestamp=false, $timezone=false)
{
   
$userTimezone = new DateTimeZone(!empty($timezone) ? $timezone : 'GMT');
   
$gmtTimezone = new DateTimeZone('GMT');
   
$myDateTime = new DateTime(($timestamp!=false?date("r",(int)$timestamp):date("r")), $gmtTimezone);
   
$offset = $userTimezone->getOffset($myDateTime);
    return
date($format, ($timestamp!=false?(int)$timestamp:$myDateTime->format('U')) + $offset);
}

/* Example */
echo 'System Date/Time: '.date("Y-m-d | h:i:sa").'<br>';
echo
'New York Date/Time: '._date("Y-m-d | h:i:sa", false, 'America/New_York').'<br>';
echo
'Belgrade Date/Time: '._date("Y-m-d | h:i:sa", false, 'Europe/Belgrade').'<br>';
echo
'Belgrade Date/Time: '._date("Y-m-d | h:i:sa", 514640700, 'Europe/Belgrade').'<br>';
?>
This is the best and fastest solution for this problem. Working almost identical to date() function only as a supplement has the time zone option.
up
24
FiraSEO
3 years ago
this how you make an HTML5 <time> tag correctly

<?php

echo '<time datetime="'.date('c').'">'.date('Y - m - d').'</time>';

?>

in the "datetime" attribute you should put a machine-readable value which represent time , the best value is a full time/date with ISO 8601 ( date('c') ) ,,, the attr will be hidden from users

and it doesn't really matter what you put as a shown value to the user,, any date/time format is okay !

This is very good for SEO especially search engines like Google .
up
8
Charlie
9 months ago
For HTML5 datetime-local HTML input controls (http://www.w3.org/TR/html-markup/input.datetime-local.html) use format example: 1996-12-19T16:39:57

To generate this, escape the 'T', as shown below:

<?php
date
('Y-m-d\TH:i:s');
?>
up
2
tkachenko_ivan at bk dot ru
10 months ago
<?php
/**
* Convert a strftime format to a date format
*
* Unsupported strftime formats : %U, %W, %C, %g, %r, %R, %T, %X, %c, %D, %F, %x
* Unsupported date formats : S, n, t, L, B, G, u, e, I, P, Z, c, r
*
* @param string $strftimeFormat a strftime format
* @return string
*/
function strftimeFormatToDate($strftimeFormat) {

   
$caracs = array(
       
"%d" => "d",
       
"%a" => "D",
       
"%e" => "j",
       
"%A" => "l",
       
"%u" => "N",
       
"%w" => "w",
       
"%j" => "z",
       
"%V" => "W",
       
"%B" => "F",
       
"%m" => "m",
       
"%b" => "M",
       
"%G" => "o",
       
"%Y" => "Y",
       
"%y" => "y",
       
"%P" => "a",
       
"%p" => "A",
       
"%l" => "g",
       
"%I" => "h",
       
"%H" => "H",
       
"%M" => "i",
       
"%S" => "s",
       
"%z" => "O",
       
"%Z" => "T",
       
"%s" => "U",
    );
    return
strtr((string)$strftimeFormat, $caracs);
}

$strftimeFormat = '%Y-%m-%d %H:%M:%S';
$formatDate = strftimeFormatToDate($strftimeFormat); // Y-m-d H:i:s
?>
up
9
matthew dot hotchen at worldfirst dot com
2 years ago
FYI: there's a list of constants with predefined formats on the DateTime object, for example instead of outputting ISO 8601 dates with:

<?php
echo date('c');
?>

or

<?php
echo date('Y-m-d\TH:i:sO');
?>

You can use

<?php
echo date(DateTime::ISO8601);
?>

instead, which is much easier to read.
up
4
Anonymous
8 months ago
If timestamp is a string, date converts it to an integer in a possibly unexpected way:

<?php
echo (int)'0x10'; //0
echo intval('0x10'); //0
echo date('s', '0x10'); //gives 16
//however, no octal conversion:
echo date('s', '010'); //gives 10
?>

(PHP 5.6.16)
up
10
adityabhai at gmail dot com
2 years ago
For Microseconds, we can get by following:

echo date('Ymd His'.substr((string)microtime(), 1, 8).' e');

Thought, it might be useful to someone !
up
6
@PeteWilliams
6 years ago
If you want to use HTML5's <date> tag, the following code will generate the machine-readable value for the 'datetime' attribute:

<?php

/**
* formats the date passed into format required by 'datetime' attribute of <date> tag
* if no intDate supplied, uses current date.
* @param intDate integer optional
* @return string
**/
function getDateTimeValue( $intDate = null ) {

   
$strFormat = 'Y-m-d\TH:i:s.uP';
   
$strDate = $intDate ? date( $strFormat, $intDate ) : date( $strFormat ) ;
   
    return
$strDate;
}

echo
getDateTimeValue();

?>
up
9
bakerj417 at gmail dot com
4 years ago
If you are having an issue getting u to work so is everyone else. The solution that I am using which I found on another site(so not taking credit) is to use this:

     date("Y/m/d H:i:s"). substr((string)microtime(), 1, 6);

that will give you:

     yyyy/mm/dd hh:ii:ss.uuuuuu

hope this helps someone in need!

thanks all
up
7
eduardo at digmotor dot com dot br
7 years ago
Thanks to tcasparr at gmail dot com for the great idea (at least for me) ;)
I changed the code a little to replicate the functionality of date_parse_from_format, once I don't have PHP 5.3.0 yet. This might be useful for someone. Hope you don't mind changing your code tcasparr at gmail dot com.

<?php
/*******************************************************
* Simple function to take in a date format and return array of associated
* formats for each date element
*
* @return array
* @param string $strFormat
*
* Example: Y/m/d g:i:s becomes
* Array
* (
*     [year] => Y
*     [month] => m
*     [day] => d
*     [hour] => g
*     [minute] => i
*     [second] => s
* )
*
*  This function is needed for  PHP < 5.3.0
********************************************************/
function dateParseFromFormat($stFormat, $stData)
{
   
$aDataRet = array();
   
$aPieces = split('[:/.\ \-]', $stFormat);
   
$aDatePart = split('[:/.\ \-]', $stData);
    foreach(
$aPieces as $key=>$chPiece)   
    {
        switch (
$chPiece)
        {
            case
'd':
            case
'j':
               
$aDataRet['day'] = $aDatePart[$key];
                break;
               
            case
'F':
            case
'M':
            case
'm':
            case
'n':
               
$aDataRet['month'] = $aDatePart[$key];
                break;
               
            case
'o':
            case
'Y':
            case
'y':
               
$aDataRet['year'] = $aDatePart[$key];
                break;
           
            case
'g':
            case
'G':
            case
'h':
            case
'H':
               
$aDataRet['hour'] = $aDatePart[$key];
                break;   
               
            case
'i':
               
$aDataRet['minute'] = $aDatePart[$key];
                break;
               
            case
's':
               
$aDataRet['second'] = $aDatePart[$key];
                break;           
        }
       
    }
    return
$aDataRet;
}
?>

Also, if you need to change the format of dates:

<?php
function changeDateFormat($stDate,$stFormatFrom,$stFormatTo)
{
 
// When PHP 5.3.0 becomes available to me
  //$date = date_parse_from_format($stFormatFrom,$stDate);
  //For now I use the function above
 
$date = dateParseFromFormat($stFormatFrom,$stDate);
  return
date($stFormatTo,mktime($date['hour'],
                                   
$date['minute'],
                                   
$date['second'],
                                   
$date['month'],
                                   
$date['day'],
                                   
$date['year']));
}

?>
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1
geoffrey dot hoffman at gmail dot com
8 months ago
I just wanted to emphasise that the return value of date( ) is a string, even when the result of your date format string is a number, such as "j" -> a number 1 to 31, or 'N' -> a day number 1 for Monday through 7 for Sunday... it's still returned as a string! "1" or "7" or "31". This is much more obvious on the "zero-padded" results, but it's worth repeating.

If you aren't careful, you can get stuck in a while loop comparing days of the week with something like:

<?php
 
// Evil! Don't use this! This will never return!
  
while ( date('N', $time ) !== 7 ) {
       
$time = $time - 86400;
   }
?>

... for example. The result of date( ) should be cast to an int for numeric comparison with the exact equality operator:

<?php
 
// Works!
  
while ( (int)date('N', $time ) !== 7 ) {
       
$time = $time - 86400;
   }
?>

Wasted an hour today on that silly mistake.
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5
Tim Connolly
4 years ago
Here's my solution for looking up the month number by name (used when parsing an 'ls'):

<?php
 
for($m=1;$m<=12;$m++){
   
$month=date("M",mktime(0,0,0,$m,1,2000));
   
$mon["$month"]=$m;
  }
?>
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6
ghotinet
5 years ago
Most spreadsheet programs have a rather nice little built-in function called NETWORKDAYS to calculate the number of business days (i.e. Monday-Friday, excluding holidays) between any two given dates. I couldn't find a simple way to do that in PHP, so I threw this together. It replicates the functionality of OpenOffice's NETWORKDAYS function - you give it a start date, an end date, and an array of any holidays you want skipped, and it'll tell you the number of business days (inclusive of the start and end days!) between them.

I've tested it pretty strenuously but date arithmetic is complicated and there's always the possibility I missed something, so please feel free to check my math.

The function could certainly be made much more powerful, to allow you to set different days to be ignored (e.g. "skip all Fridays and Saturdays but include Sundays") or to set up dates that should always be skipped (e.g. "skip July 4th in any year, skip the first Monday in September in any year"). But that's a project for another time.

<?php

function networkdays($s, $e, $holidays = array()) {
   
// If the start and end dates are given in the wrong order, flip them.   
   
if ($s > $e)
        return
networkdays($e, $s, $holidays);

   
// Find the ISO-8601 day of the week for the two dates.
   
$sd = date("N", $s);
   
$ed = date("N", $e);

   
// Find the number of weeks between the dates.
   
$w = floor(($e - $s)/(86400*7));    # Divide the difference in the two times by seven days to get the number of weeks.
   
if ($ed >= $sd) { $w--; }        # If the end date falls on the same day of the week or a later day of the week than the start date, subtract a week.

    // Calculate net working days.
   
$nwd = max(6 - $sd, 0);    # If the start day is Saturday or Sunday, add zero, otherewise add six minus the weekday number.
   
$nwd += min($ed, 5);    # If the end day is Saturday or Sunday, add five, otherwise add the weekday number.
   
$nwd += $w * 5;        # Add five days for each week in between.

    // Iterate through the array of holidays. For each holiday between the start and end dates that isn't a Saturday or a Sunday, remove one day.
   
foreach ($holidays as $h) {
       
$h = strtotime($h);
        if (
$h > $s && $h < $e && date("N", $h) < 6)
           
$nwd--;
    }

    return
$nwd;
}

$start = strtotime("1 January 2010");
$end = strtotime("13 December 2010");

// Add as many holidays as desired.
$holidays = array();
$holidays[] = "4 July 2010";            // Falls on a Sunday; doesn't affect count
$holidays[] = "6 September 2010";        // Falls on a Monday; reduces count by one

echo networkdays($start, $end, $holidays);    // Returns 246

?>

Or, if you just want to know how many work days there are in any given year, here's a quick function for that one:

<?php

function workdaysinyear($y) {
   
$j1 = mktime(0,0,0,1,1,$y);
    if (
date("L", $j1)) {
        if (
date("N", $j1) == 6)
            return
260;
        elseif (
date("N", $j1) == 5 or date("N", $j1) == 7)
            return
261;
        else
            return
262;
    }
    else {
        if (
date("N", $j1) == 6 or date("N", $j1) == 7)
            return
260;
        else
            return
261;
    }
}

?>
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3
Bas Vijfwinkel
4 years ago
Note that some formatting options are different from MySQL.
For example using a 24 hour notation without leading zeros is the option '%G' in PHP but '%k' in MySQL.
When using dynamically generated date formatting string, be careful to generate the correct options for either PHP or MySQL.
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4
Anonymous
2 years ago
It's common for us to overthink the complexity of date/time calculations and underthink the power and flexibility of PHP's built-in functions.  Consider http://php.net/manual/en/function.date.php#108613

<?php
function get_time_string($seconds)
{
    return
date('H:i:s', strtotime("2000-01-01 + $seconds SECONDS"));
}
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6
mel dot boyce at gmail dot com
10 years ago
I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics. One of the most useful skills you can utilize when performing date math is taking full advantage of the UNIX timestamp. The UNIX timestamp was built for this kind of work.

An example of this relates to a comment made by james at bandit-dot-co-dot-en-zed. James was looking for a way to calculate the number of days which have passed since a certain date. Rather than using mktime() and a loop, James can subtract the current timestamp from the timestamp of the date in question and divide that by the number of seconds in a day:
<?php
$days
= floor((time() - strtotime("01-Jan-2006"))/86400);
print(
"$days days have passed.\n");
?>

Another usage could find itself in a class submitted by Kyle M Hall which aids in the creation of timestamps from the recent past for use with MySQL. Rather than the looping and fine tuning of a date, Kyle can use the raw UNIX timestamps (this is untested code):
<?php
$ago
= 14; // days
$timestamp = time() - ($ago * 86400);
?>

Hopefully these two examples of "UNIX-style" timestamp usage will help those finding date mathematics more elusive than it should be.
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6
SpikeDaCruz
10 years ago
The following function will return the date (on the Gregorian calendar) for Orthodox Easter (Pascha).  Note that incorrect results will be returned for years less than 1601 or greater than 2399. This is because the Julian calendar (from which the Easter date is calculated) deviates from the Gregorian by one day for each century-year that is NOT a leap-year, i.e. the century is divisible by 4 but not by 10.  (In the old Julian reckoning, EVERY 4th year was a leap-year.)

This algorithm was first proposed by the mathematician/physicist Gauss.  Its complexity derives from the fact that the calculation is based on a combination of solar and lunar calendars.

<?php
function getOrthodoxEaster($date){
 
/*
   Takes any Gregorian date and returns the Gregorian
   date of Orthodox Easter for that year.
  */
 
$year = date("Y", $date);
 
$r1 = $year % 19;
 
$r2 = $year % 4;
 
$r3 = $year % 7;
 
$ra = 19 * $r1 + 16;
 
$r4 = $ra % 30;
 
$rb = 2 * $r2 + 4 * $r3 + 6 * $r4;
 
$r5 = $rb % 7;
 
$rc = $r4 + $r5;
 
//Orthodox Easter for this year will fall $rc days after April 3
 
return strtotime("3 April $year + $rc days");
}
?>
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5
Anonymous
8 years ago
Correct format for a MySQL DATETIME column is
<?php $mysqltime = date ("Y-m-d H:i:s", $phptime); ?>
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3
Just.Kevin
7 years ago
In order to determine if a year is a leap year an earlier poster suggested simply checking to see if the year is a multiple of four:

<?php
function is_leapyear_broken($year = 2004) {
return (
$year%4)==0;
}
?>

While this will work for the majority of years it will not work on years that are multiples of 100 but not multiples of 400 i.e.(2100).
A function not using php's date() function that will also account for this small anomaly in leap years:

<?php
function is_leapyear_working($year = 2004) {
    if(((
$year%4==0) && ($year%100!=0)) || $year%400==0) {
        return
true;
    }
    return
false;
}
?>

While is_leapyear_working will not return true for the few non-leap years divisible by four I couldn't tell you if this is more or less efficient than using php's date() as an even earlier poster suggested:

<?php
function is_leapyear($year = 2004) {
$is_leap = date('L', strtotime("$year-1-1"));
return
$is_leap;
}
?>
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0
Horst Frank
5 months ago
in some cases you can't or don't like to change the setlocal(), but you want to get a translated date(). This function is an example for a geman translation-table.

function ddate ($format,$timestamp) {

$trans = array(
    'Monday'    => 'Montag',
    'Tuesday'   => 'Dienstag',
    'Wednesday' => 'Mittwoch',
    'Thursday'  => 'Donnerstag',
    'Friday'    => 'Freitag',
    'Saturday'  => 'Samstag',
    'Sunday'    => 'Sonntag',
    'Mon'       => 'Mo',
    'Tue'       => 'Di',
    'Wed'       => 'Mi',
    'Thu'       => 'Do',
    'Fri'       => 'Fr',
    'Sat'       => 'Sa',
    'Sun'       => 'So',
    'January'   => 'Januar',
    'February'  => 'Februar',
    'March'     => 'M&auml;rz',
    'May'       => 'Mai',
    'June'      => 'Juni',
    'July'      => 'Juli',
    'October'   => 'Oktober',
    'December'  => 'Dezember',
    'Mar'       => 'M&auml;r',
    'Oct'       => 'Okt',
    'Dec'       => 'Dez',
);

return strtr(date($format,$timestamp),$trans);

}
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0
Anonymous
2 years ago
To quickly convert date("N") to a 0 based index with Sunday being represented as 0, you can run it against modulus 7:

<?php
$first_of_month_index
= date('N', strtotime('4/1/1990')) % 7;
?>
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0
Leopietroni
4 years ago
This function will add working day to a given timestamp

<?php
function addworkinday($timestamp,$daystoadd){
    
    
$dayoftheweek = date("N",$timestamp);
    
$sum =$dayoftheweek +$daystoadd;
    
while (
$sum >= 6) {
    
    
$daystoadd=$daystoadd+1;
   
$sum=$sum-1;
}
return
$timestamp +(60*60*24*$daystoadd);

}
?>
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0
gerben at gerbenwijnja dot nl
4 years ago
I use the function below to calculate the Unix timestamp of the start of a week. It includes a boolean flag to request a GMT offset instead of the current locale setting.

<?php

function getWeekOffsetTimestamp($year, $week, $useGmt = false) {
        if (
$useGmt) {
               
// Backup timezone and set to GMT
               
$timezoneSettingBackup = date_default_timezone_get();
               
date_default_timezone_set("GMT");
        }

       
// According to ISO-8601, January 4th is always in week 1
       
$halfwayTheWeek = strtotime($year."0104 +".($week - 1)." weeks");

       
// Subtract days to Monday
       
$dayOfTheWeek = date("N", $halfwayTheWeek);
       
$daysToSubtract = $dayOfTheWeek - 1;

       
// Calculate the week's timestamp
       
$unixTimestamp = strtotime("-$daysToSubtract day", $halfwayTheWeek);

        if (
$useGmt) {
               
// Reset timezone to backup
               
date_default_timezone_set($timezoneSettingBackup);
        }

        return
$unixTimestamp;
}

?>
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0
Edward Rudd
6 years ago
To actually make use ot the "u" (microsecond) you need to use the DateTime object and not the date() function.

For example

<?php
$t
= microtime(true);
$micro = sprintf("%06d",($t - floor($t)) * 1000000);
$d = new DateTime( date('Y-m-d H:i:s.'.$micro,$t) );

print
$d->format("Y-m-d H:i:s.u");
?>
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Chris
4 years ago
Use this to convert the local/UTC hour to the UTC/local hour:

<?php
for($utc_to_local = array(), $offset = date('Z'), $h = 0; $h < 24; $utc_to_local[] = date('G', mktime($h++)+$offset));
$local_to_utc = array_flip($utc_to_local);

echo
"2 am local is ", $local_to_utc[2], " UTC";
echo
"3 pm UTC is ", $utc_to_local[15], " local";
?>

This is useful when you need to do many conversions. Lookup tables are faster than calling date() and mktime() multiple times.
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lb at bostontech dot net
6 years ago
Not sure why this got ignored the first time, but this is an even simpler way to check leap year:

<?php
function isLeapYear($year)
    { return (((
$year%4==0) && ($year%100)) || $year%400==0) ? (true):(false); }
?>
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webmaster1989 at gmail dot com
4 years ago
Sometimes it is very useful to convert a sql timestamp to an also called NTP time. This is often used as time date notation in XML RSS pages. To convert a timestamp to this NTP notation try the following:

<?php
 
echo date('D, d M Y h:i:s O', strtotime ($timestamp);
?>
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-4
frank at interactinet dot com
4 years ago
If you want to compare this week with the same week last year, here is some code to get you the time at the beginning of the week.  You can then add days, hours, etc to get to the day of the week that you want to know about.

<?php
        $time_passed
= (date('N')-1)* 24 * 3600; // time since start of week in days
       
$startOfWeek = mktime(0,0,0,date('m'),date('d'),date('Y')) - $time_passed;
       
   
       
$lastyear = $startOfWeek - 365*24*3600;   

       
// make sure time used from last year is the same week of the year   
       
$weekdiff = date('W') - date('W',$lastyear);
        if(
$weekdiff != 0)
        {
           
$lastyear = $lastyear + ($weekdiff*7*24*3600);
        }
       
       
$lastyear_time_passed = (date('N',$lastyear)-1) * 24 * 3600; // time since start of week in days
       
       
$startOfWeek_lastyear = mktime(0,0,0,date('m',$lastyear),date('d',$lastyear),date('Y',$lastyear)) - $lastyear_time_passed;
?>

So now you have the unix time for the start of this week ($startOfWeek), and the start of the same week last year ($startOfWeek_lastyear).

You can convert back to datetime format easily:

<?php
       
echo date('Y-m-d H:i:s',$startOfWeek).'<br>';
        echo
date('Y-m-d H:i:s',$startOfWeek_lastyear).'<br><br>';
       
        echo
date('l F jS, Y',$startOfWeek).'<br>';
        echo
date('l F jS, Y',$startOfWeek_lastyear);
?>
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-5
m_ocx at yahoo dot com
4 years ago
Here is a cool Date class to implement the date function:

<?php
/*
* @author    Gchats
*
* Date class
*/
class Date
{   
    private
$shortDateFormat = "F j, Y";
    private
$longDateFormat = "F j, Y, g:i a";
    private
$timestamp = 0;
   
   
/**
    * Default constructor
    *
    * @param    integer        $timestamp    unix time stamp
    */
   
function __construct($timestamp = 0)
    {
       
$this->timestamp = $timestamp;
    }
   
   
/**
    * Returns the given timestamp in the constructor
    *
    * @return    integer        time stamp
    */
   
public function getTime()
    {
        return (int)
$this->timestamp;
    }
   
   
/*
     * Returns long formatted date of the given timestamp
     *
     * @access public
     * @return     string    Long formatted date
     */
   
public function long()
    {
        if (
$this->timestamp > 0 )
        {
            return
date ( $this->longDateFormat , $this->timestamp );
        }
        else
        {
            return
"";
        }
    }

   
/*
     * Returns short formatted date of the given timestamp
     *
     * @access public
     * @return     string    Short formatted date
     */   
   
public function short()
    {
        if (
$this->timestamp > 0 )
        {
            return
date ( $this->shortDateFormat , $this->timestamp );
        }
        else
        {
            return
"";
        }
    }
   
    public function
__toString()
    {
        return
$this->timestamp;
    }
   
}
?>
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-4
ttt_joe_08
2 years ago
Just FYI, it's more appropriate to say "UTC", not "GMT". GMT was given up in 1972 and UTC is now the proper way. The reason being G stands for Greenwich, which naturally upset some people.
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-6
scott at keenot dot es
3 years ago
If anyone needs a really fast function for converting a datetime string (i.e. as retrieved from a MySQL DATETIME entry) into a human-friendly time output analogous to date($format, $time), here's a useful function.

<?php
function fdate($datetimestring = '1970-01-01 00:00:00', $format = 'U') {
 
// Create a datetime object, return it formatted
  // If you want to give credit for this somewhere, thanks.
  // You really don't have to though; this is kinda obvious
 
$dt = new DateTime($datetimestring);
  return
$dt->format($format);
}
?>

The main purpose of this is to reduce lines of code and allow inline coding. For example:
<?php
/* ... */
echo "This page was submitted on ".fdate($row['created'], 'F j, Y g:i:s A')." and last modified ".fdate($row['modified'], 'F j, Y g:i:s A')."<br />\n";
/* ... */
?>
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-1
Al Roker
4 months ago
When using 'U' to return a UNIX time stamp, you may not get what you expect. In the following example, we try to get the current Unix time stamp for a user in a different timezone.

<?php
// Doesn't work
$timezone = new \DateTimeZone($userTimeZone);
$date = new \DateTime('@' . time(), $timezone);
$date->setTimezone($timezone);
$now = $date->format('U');
?>

$now will return the same (the server's current) Unix time stamp regardless which timezone your user is in.

To get the actual Unix time stamp based on a time zone, replace format('U') as in the following example;

<?php
// This works
$timezone = new \DateTimeZone($userTimeZone);
$date = new \DateTime('@' . time(), $timezone);
$date->setTimezone($timezone);
$now = $date->getTimestamp() + $date->getOffset();
?>
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-11
Anonymous
3 years ago
To find last sunday for given date

<?php
         $day
= '2012-10-04';
         echo
'last sunday :  '.date("Y-m-d",strtotime($day." last Sunday "));
?>

output:

last sunday : 2012-09-30
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-7
JonathanCross.com
8 years ago
<?php
// A demonstration of the new DateTime class for those
// trying to use dates before 1970 or after 2038.
?>
<h2>PHP 2038 date bug demo (php version <?php echo phpversion(); ?>)</h1>
<div style='float:left;margin-right:3em;'>
<h3>OLD Buggy date()</h3>
<?php
  $format
='F j, Y';
  for (
$i = 1900; $i < 2050; $i++) {
   
$datep = "$i-01-01";
   
?>
    Trying: <?php echo $datep; ?> = <?php echo date($format, strtotime($datep)); ?><br>
    <?php
 
}
?></div>
<div style='float:left;'>
  <h3>NEW DateTime Class (v 5.2+)</h3><?php
 
for ( $i = 1900; $i < 2050; $i++) {
   
$datep = "$i-01-01";
   
$date = new DateTime($datep);
   
?>
    Trying: <?php echo $datep; ?> = <?php echo $date->format($format); ?><br>
    <?php
 
}
?></div>
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-10
Anon
4 years ago
I needed to convet a duration timestamp into H:i:s but whenever I did it kept bringing 5 back as 01:00:05 (due to some DST stuff) so I made this function to replace date(). It has no optimisations but hopefully someone might find it useful:

<?php
   
function get_time_string(){
       
$time = 3600+(60*32)+(50); // 01:32:50
       
$time_string = '';

       
$hours = (int)($time/(60*60));
        if(
strlen($hours) > 1){
           
$time_string = $hours.':';
        }else{
           
$time_string = '0'.$hours.':';
        }

       
$minutes = (int)(($time%(60*60))/(60));
        if(
$minutes >= 1){
            if(
strlen($minutes) > 1){
               
$time_string .= $minutes.':';
            }else{
               
$time_string .= '0'.$minutes.':';
            }

           
$seconds = ($time%(60*60))%(60);
            if(
strlen($seconds) > 1){
               
$time_string .= $seconds;
            }else{
               
$time_string .= '0'.$seconds;
            }
        }else{
            if(
strlen($time) > 1){
               
$time_string .= '00:'.$time;
            }else{
               
$time_string .= '00:0'.$time;
            }
        }
        return
$time_string;
    }
?>
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-11
nathan
4 years ago
<?php
/* the following variables are set to appropriate
  characters recognized by php version 5 that
  will get the date. To display the date, we have
  to use 'echo' or 'print' to send the variable
  data to the browser
*/

$day=date("l");
$date=date("j");
$suffix=date("S");
$month=date("F");
$year=date("Y");
echo
$day . ", " . $month . " " . $date . $suffix . ", " . $year;
?>

rudimentary, simple way to due things, but it gets the job done for someone learning more on the subject.
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-6
david dot leon at gmx dot com
2 years ago
<?php
//date returns microseconds.
function mdate($format, $microtime = null) {
       
$microtime = explode(' ', ($microtime ? $microtime : microtime()));
        if (
count($microtime) != 2) return false;
       
$microtime[0] = $microtime[0] * 1000000;
       
$format = str_replace('u', $microtime[0], $format);
        return
date($format, $microtime[1]);
    }
?>

echo mdate('Y-m-d H:i:s.u');

2014-05-19 12:41:59.202303
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-7
stokestack at gmail dot com
4 years ago
If you want to find your server's timezone offset from GMT, it seems as though you could just do:

date('Z')

to get the number of seconds offset. But PHP requires that you call date_default_timezone_set().  So if you have to hard-code a timezone, why not simply hard-code a variable that tells you the offset from GMT?  If you set the timezone to GMT, the dates in your database will still be in local time, but time('Z') will return zero.

To keep your code portable across servers in different timezones, you can do this:

date_default_timezone_set(date_default_timezone_get())

This keeps PHP from complaining that you haven't called date_default_timezone_set(), but makes your code portable.  Ridiculous.
up
-9
Anonymous
3 years ago
Was trying to compare dates when I noticed that:

<?php

var_dump
(date('d.m.Y', null));//string(10) "01.01.1970"
var_dump(date('d.m.Y', ''));//bool(false)

?>

Thought it's worth mentioning. Caused some weird logs to be produced in our system since this does not evaluate to the same.
up
-4
sanket at webvice dot co dot uk
1 year ago
<?
/**
     * This function gives you the next working days based on the buffer
     *
     * @param $date must be in YYYY-MM-DD format
     * @param int $buffer
     * @param string $holidays - You can pass either an array of holidays in YYYYYMMDD format or a URL for a .ics file
     * containing holidays this defaults to the UK govt holiday data for England and Wales
     * @return string
     */
   
   
function getWorkingDays($date,$buffer=1,$holidays='') {
        if (
$holidays==='') $holidays = 'https://www.gov.uk/bank-holidays/england-and-wales.ics';

        if (!
is_array($holidays)) {
           
$ch = curl_init($holidays);
           
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
           
$ics = curl_exec($ch);
           
curl_close($ch);
           
$ics = explode("\n",$ics);
           
$ics = preg_grep('/^DTSTART;/',$ics);
           
$holidays = preg_replace('/^DTSTART;VALUE=DATE:(\\d{4})(\\d{2})(\\d{2}).*/s','$1-$2-$3',$ics);
        }

       
$addDay = 0;
        while (
$buffer--) {
            while (
true) {
               
$addDay++;
               
$newDate = date('Y-m-d', strtotime("$date +$addDay Days"));
               
$newDayOfWeek = date('w', strtotime($newDate));
                if (
$newDayOfWeek>0 && $newDayOfWeek<6 && !in_array($newDate,$holidays)) break;
            }
        }

        return
$newDate;
    }

   
?>
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-13
jc
8 years ago
date("W") returns the iso8601 week number, while date("Y") returns the _current_ year. This can lead to odd results. For example today (dec 31, 2007) it returns 1 for the week and of course 2007 for the year. This is not wrong in a strict sense because iso defines this week as the first of 2008 while we still have 2007.

So, if you don't have another way to safely retrieve the year according to the iso8061 week-date - strftime("%G") doesn't work on some systems -, you should be careful when working with date("W").

For most cases strftime("%W") should be a safe replacement.

[edit: Much easier is to use "o" (lower case O) instead of "Y"]
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-1
aalaap at gmail dot com
1 month ago
If you need to programatically get a list of all the supported date format identifiers, you can use this simple function:

<?php

function getDateFormat() {
    return
str_split('dDjlNSwzWFmMntLoYyaABgGhHisueIOPTZcrU');
}

?>

PHP doesn't have a built-in identifier listing function, but it has one for listing timezone names.
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-9
jock
2 years ago
As of PHP 5.3.3, date('c') will produce a string like this:

2014-06-17T16:22:42+02:00

Instead date (DATE_ISO8601) will produce:

2014-06-17T16:23:36+0200

which lacks the semicolon in the timezone part. Both are ISO8601 compliant anyway, but I found that the latter has better compatibility with other languages like python.
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-14
lehal2 at hotmail dot com
4 years ago
here is an example how you can make numeric days of the week from 1 to 7(Monday to Friday)

<?php
$currentdate 
= mktime(0, 0, 0, date("m")  , date("d"), date("Y"));
     echo
$day_eg1 = date ('N',$currentdate);
      echo
$day_eg2 = date("N", $today+1 * 24 * 3600);
    echo
$day_eg3= date("N", $today+2 * 24 * 3600);
    echo
$day_eg4 = date("N", $today+3 * 24 * 3600);
    echo
$day_eg5 = date("N", $today+4 * 24 * 3600);
    echo
$day_eg6 = date("N", $today+5 * 24 * 3600);
    echo
$day_eg7 = date("N", $today+6 * 24 * 3600);
?>
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-15
blinov vyacheslav AT gmail.com
5 years ago
It was oblivious and discouraging that it dont mentioned in docs. If you will use W to get week number be aware:
first days of year can be in a week of previous year, and week number always has leading zero

<?php

echo date("YW", strtotime("2011-01-07")); // gives 201101
echo date("YW", strtotime("2011-01-01")); // gives 201152
echo date("YW", strtotime("2011-12-31")); // gives 201152 too

?>

so you can`t rely on number of week given from this function inside your program if you want to use it for some logic
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-14
chubby at chicks dot com
8 years ago
<?php
/**
     * Checks wether a date is between an interval
     *
     * Usage:
     *     
     * // check if today is older than 2008/12/31
     * var_dump(currentDayIsInInterval('2008/12/31'));
     * // check if today is younger than 2008/12/31
     * var_dump(currentDayIsInInterval(null,'2008/12/31'));
     * // check if today is between 2008/12/01 and 2008/12/31
     * var_dump(currentDayIsInInterval('2008/12/01','2008/12/31')); 
     *
     * Will trigger errors if date is in wrong format, notices if $begin > $end    
     *         
     * @param string $begin Date string as YYYY/mm/dd
     * @param string $end Date string as YYYY/mm/dd
     * @return bool 
     */
function currentDayIsInInterval($begin = '',$end = '')
{
       
$preg_exp = '"[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]"';
       
$preg_error = 'Wrong parameter passed to function '.__FUNCTION__.' : Invalide date
format. Please use YYYY/mm/dd.'
;
       
$interval_error = 'First parameter in '.__FUNCTION__.' should be smaller than
second.'
;
        if(empty(
$begin))
        {
               
$begin = 0;
        }
        else
        {
                if(
preg_match($preg_exp,$begin))
                {
                       
$begin = (int)str_replace('/','',$begin);
                }
                else
                {
                       
trigger_error($preg_error,E_USER_ERROR);
                }
        }
        if(empty(
$end))
        {
               
$end = 99999999;
        }
        else
        {
                if(
preg_match($preg_exp,$end))
                {
                       
$end = (int)str_replace('/','',$end);
                }
                else
                {
                       
trigger_error($preg_error,E_USER_ERROR);
                }
        }
        if(
$end < $begin)
        {
               
trigger_error($interval_error,E_USER_WARNING);
        }
       
$time = time();
       
$now = (int)(date('Y',$time).date('m',$time).date('j',$time));
        if(
$now > $end or $now < $begin)
        {
                return
false;
        }
        return
true;
}
?>
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-6
akshayinbox at gmail dot com
1 year ago
When using date(), be sure to "double-escape" certain characters, for example, if printing the word "at", double escape "t" otherwise it will be treated as "tab" simply leading to a space being inserted.

Example:
<?php echo "Last updated ".date("M j<\s\u\p>S</\s\u\p\>, Y \a\\t h:i A"); ?>

will output
Last updated Aug 23rd 2015 at 2:47 PM

(assuming today is Aug 23rd 2015 and it is 2:47 PM)
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-13
Jacques Marais
2 years ago
If you want to print something like: Tuesday, the 14th of January, 2014

Use this:

<?php
echo date("l", strtotime("now")).', the'.date(" jS", strtotime("now")).' of'.date(" F, Y", strtotime("now"));
?>

This is because you cannot use words in the date string. If you use words in the date string it will be seen as a format character

So if you use:

<?php
echo date("l, the jS of F, Y", strtotime("now"));
?>

It will print something like: Tuesday, 3108Europe/Berlin 14th 2014f January, 2014
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-6
krejci dot info at seznam dot cz
1 year ago
I recommend to use "/" instead of "-" when creating dates:

<?
   
if( date( 'd/m' ) >= date_create( '01/09' ) ) { }
?>
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-21
Ryan
1 year ago
That  is just too hard anyone have it easier terms for a lad who only has internet for 5 mis a day cause he has to walk his pet peanut
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-20
Manu Manjunath
2 years ago
If you want to use "u" format specifier for micrseconds without changing to DateTime object, you may write a function as below:
<?php
/**
* Quick replacement to date() function to handle the 'u' format specifier (for microseconds)
* @param string $format Date format string - the same format string you would pass to date() function
* @param float $timestamp [optional] Unix timestamp with microseconds - Typically output of <b>microtime(true)</b>
* @return string Formatted string
*/
function date_with_micro($format, $timestamp = null) {
    if (
is_null($timestamp) || $timestamp === false) {
       
$timestamp = microtime(true);
    }
   
$timestamp_int = (int) floor($timestamp);
   
$microseconds = (int) round(($timestamp - floor($timestamp)) * 1000000.0, 0);
   
$format_with_micro = str_replace("u", $microseconds, $format);
    return
date($format_with_micro, $timestamp_int);
}
?>

You can safely replace your date() function with date_with_micro().
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-43
matt
4 years ago
date() has some strange behavior at extremely high values:

<?php
echo "9223372036854775805: " . date("Y-m-d g:i:s a"9223372036854775805) . "\n";
echo
"9223372036854775806: " . date("Y-m-d g:i:s a"9223372036854775806) . "\n";
echo
"9223372036854775807: " . date("Y-m-d g:i:s a"9223372036854775807) . " (0x7FFFFFFFFFFFFFFF)\n";
echo
"9223372036854775808: " . date("Y-m-d g:i:s a"9223372036854775808) . "\n";
echo
"9223372036854775809: " . date("Y-m-d g:i:s a"9223372036854775809) . "\n";
echo
"9223372036854775810: " . date("Y-m-d g:i:s a"9223372036854775810) . "\n";
echo
"...\n";
echo
"9223372036854776832: " . date("Y-m-d g:i:s a"9223372036854776832) . "\n";
echo
"9223372036854776833: " . date("Y-m-d g:i:s a"9223372036854776833) . "\n";
echo
"...\n";
echo
"9223372036854778879: " . date("Y-m-d g:i:s a"9223372036854778879) . "\n";
echo
"9223372036854778880: " . date("Y-m-d g:i:s a"9223372036854778880) . "\n";
echo
"...\n";
echo
"9223372036854780928: " . date("Y-m-d g:i:s a"9223372036854780928) . "\n";
echo
"9223372036854780929: " . date("Y-m-d g:i:s a"9223372036854780929) . "\n";
echo
"...\n";
echo
"9223372036854782975: " . date("Y-m-d g:i:s a"9223372036854782975) . "\n";
echo
"9223372036854782976: " . date("Y-m-d g:i:s a"9223372036854782976) . "\n";
echo
"...\n";
echo
"9223372036854785024: " . date("Y-m-d g:i:s a"9223372036854785024) . "\n";
echo
"9223372036854785025: " . date("Y-m-d g:i:s a"9223372036854785025) . "\n";
echo
"...\n";
echo
"9223372036854787071: " . date("Y-m-d g:i:s a"9223372036854787071) . "\n";
echo
"9223372036854787072: " . date("Y-m-d g:i:s a"9223372036854787072) . "\n";
echo
"...\n";
echo
"9223372036854789120: " . date("Y-m-d g:i:s a"9223372036854789120) . "\n";
echo
"9223372036854789121: " . date("Y-m-d g:i:s a"9223372036854789121) . "\n";
echo
"...\n";
echo
"9223372036854791167: " . date("Y-m-d g:i:s a"9223372036854791167) . "\n";
echo
"9223372036854791168: " . date("Y-m-d g:i:s a"9223372036854791168) . "\n";
echo
"...\n";
echo
"9223372036854793215: " . date("Y-m-d g:i:s a"9223372036854793215) . "\n";
echo
"9223372036854793216: " . date("Y-m-d g:i:s a"9223372036854793216) . "\n";
echo
"9223372036854793217: " . date("Y-m-d g:i:s a"9223372036854793217) . "\n";
echo
"9223372036854793218: " . date("Y-m-d g:i:s a"9223372036854793218) . "\n";
?>

Output:

9223372036854775805: 292277026596-12-04 10:30:05 am
9223372036854775806: 292277026596-12-04 10:30:06 am
9223372036854775807: 292277026596-12-04 10:30:07 am (0x7FFFFFFFFFFFFFFF)
9223372036854775808: 292277026596-12-04 10:30:08 am
9223372036854775809: 292277026596-12-04 10:30:08 am
9223372036854775810: 292277026596-12-04 10:30:08 am
...
9223372036854778879: 292277026596-12-04 10:30:08 am
9223372036854778880: 292277026596-12-04 11:04:16 am
...
9223372036854778879: 292277026596-12-04 11:04:16 am
9223372036854778880: 292277026596-12-04 11:38:24 am
...
9223372036854780928: 292277026596-12-04 11:38:24 am
9223372036854780929: 292277026596-12-04 12:12:32 pm
...
9223372036854782975: 292277026596-12-04 12:12:32 pm
9223372036854782976: 292277026596-12-04 12:46:40 pm
...
9223372036854785024: 292277026596-12-04 12:46:40 pm
9223372036854785025: 292277026596-12-04 1:20:48 pm
...
9223372036854787071: 292277026596-12-04 1:20:48 pm
9223372036854787072: 292277026596-12-04 1:54:56 pm
...
9223372036854789120: 292277026596-12-04 1:54:56 pm
9223372036854789121: 292277026596-12-04 2:29:04 pm
...
9223372036854791167: 292277026596-12-04 2:29:04 pm
9223372036854791168: 292277026596-12-04 3:03:12 pm
...
9223372036854793215: 292277026596-12-04 3:03:12 pm
9223372036854793216: 292277026596-12-04 3:03:12 pm
9223372036854793217: -292277022657-01-27 8:37:04 am
9223372036854793218: -292277022657-01-27 8:37:04 am

---

So, the last reliable unix timecode is 9223372036854775808 (0x1000000000000000). Not that you would probably ever need a date that high.
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