The DateTimeImmutable class

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

Introduction

Representation of date and time.

This class behaves the same as DateTime except new objects are returned when modification methods such as DateTime::modify() are called.

Class synopsis

class DateTimeImmutable implements DateTimeInterface {

/* Inherited constants */

public const string DateTimeInterface::ATOM = "Y-m-d\\TH:i:sP";

public const string DateTimeInterface::COOKIE = "l, d-M-Y H:i:s T";

public const string DateTimeInterface::ISO8601 = "Y-m-d\\TH:i:sO";

public const string DateTimeInterface::ISO8601_EXPANDED = "X-m-d\\TH:i:sP";

public const string DateTimeInterface::RFC822 = "D, d M y H:i:s O";

public const string DateTimeInterface::RFC850 = "l, d-M-y H:i:s T";

public const string DateTimeInterface::RFC1036 = "D, d M y H:i:s O";

public const string DateTimeInterface::RFC1123 = "D, d M Y H:i:s O";

public const string DateTimeInterface::RFC7231 = "D, d M Y H:i:s \\G\\M\\T";

public const string DateTimeInterface::RFC2822 = "D, d M Y H:i:s O";

public const string DateTimeInterface::RFC3339 = "Y-m-d\\TH:i:sP";

public const string DateTimeInterface::RFC3339_EXTENDED = "Y-m-d\\TH:i:s.vP";

public const string DateTimeInterface::RSS = "D, d M Y H:i:s O";

public const string DateTimeInterface::W3C = "Y-m-d\\TH:i:sP";

/* Methods */

public function __construct(string $datetime = "now", ?DateTimeZone $timezone = null)

#[\NoDiscard(message: "as DateTimeImmutable::add() does not modify the object itself")]
public function add(DateInterval $interval): DateTimeImmutable

public static function createFromFormat(string $format, string $datetime, ?DateTimeZone $timezone = null): DateTimeImmutable|false

public static function createFromInterface(DateTimeInterface $object): DateTimeImmutable

public static function createFromMutable(DateTime $object): static

public static function createFromTimestamp(int|float $timestamp): static

public static function getLastErrors(): array|false

#[\NoDiscard(message: "as DateTimeImmutable::modify() does not modify the object itself")]
public function modify(string $modifier): DateTimeImmutable

public static function __set_state(array $array): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::setDate() does not modify the object itself")]
public function setDate(int $year, int $month, int $day): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::setISODate() does not modify the object itself")]
public function setISODate(int $year, int $week, int $dayOfWeek = 1): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::setMicrosecond() does not modify the object itself")]
public function setMicrosecond(int $microsecond): static

#[\NoDiscard(message: "as DateTimeImmutable::setTime() does not modify the object itself")]
public function setTime(
    int $hour,
    int $minute,
    int $second = 0,
    int $microsecond = 0
): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::setTimestamp() does not modify the object itself")]
public function setTimestamp(int $timestamp): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::setTimezone() does not modify the object itself")]
public function setTimezone(DateTimeZone $timezone): DateTimeImmutable

#[\NoDiscard(message: "as DateTimeImmutable::sub() does not modify the object itself")]
public function sub(DateInterval $interval): DateTimeImmutable

public function diff(DateTimeInterface $targetObject, bool $absolute = false): DateInterval

public function format(string $format): string

public function getMicrosecond(): int

public function getOffset(): int

public function getTimestamp(): int

public function getTimezone(): DateTimeZone|false

public function __serialize(): array

public function __unserialize(array $data): void

#[\Deprecated(
since: '8.5',
message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()',
)]
public function __wakeup(): void

}

Changelog

Version	Description
8.4.0	The class constants are now typed.
7.1.0	The DateTimeImmutable constructor now includes the current microseconds in the constructed value. Before this, it would always initialise the microseconds to `0`.

DateTimeImmutable::add — Returns a new object, with added amount of days, months, years, hours, minutes and seconds
DateTimeImmutable::__construct — Returns new DateTimeImmutable object
DateTimeImmutable::createFromFormat — Parses a time string according to a specified format
DateTimeImmutable::createFromInterface — Returns new DateTimeImmutable object encapsulating the given DateTimeInterface object
DateTimeImmutable::createFromMutable — Returns new DateTimeImmutable instance encapsulating the given DateTime object
DateTimeImmutable::createFromTimestamp — Creates an instance from a Unix timestamp
DateTimeImmutable::getLastErrors — Returns the warnings and errors
DateTimeImmutable::modify — Creates a new object with modified timestamp
DateTimeImmutable::__set_state — The __set_state handler
DateTimeImmutable::setDate — Sets the date
DateTimeImmutable::setISODate — Sets the ISO date
DateTimeImmutable::setMicrosecond — Sets microsecond part of the time
DateTimeImmutable::setTime — Sets the time
DateTimeImmutable::setTimestamp — Sets the date and time based on a Unix timestamp
DateTimeImmutable::setTimezone — Sets the time zone
DateTimeImmutable::sub — Subtracts an amount of days, months, years, hours, minutes and seconds

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