php[world] 2019 — 25 years of PHP

jdmonthname

(PHP 4, PHP 5, PHP 7)

jdmonthname月の名前を返す

説明

jdmonthname ( int $julianday , int $mode ) : string

月の名前を含んだ文字列を返します。 modeはユリウス積算日をどの暦に変換するか、 どんなタイプの月名を返すかを関数に伝えます。

暦モード
モード 意味
0 グレゴリウス暦 - 省略形 Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
1 グレゴリウス暦 January, February, March, April, May, June, July, August, September, October, November, December
2 ユリウス暦 - 省略形 Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
3 ユリウス暦 January, February, March, April, May, June, July, August, September, October, November, December
4 ユダヤ暦 Tishri, Heshvan, Kislev, Tevet, Shevat, AdarI, AdarII, Nisan, Iyyar, Sivan, Tammuz, Av, Elul
5 フランス革命暦 Vendemiaire, Brumaire, Frimaire, Nivose, Pluviose, Ventose, Germinal, Floreal, Prairial, Messidor, Thermidor, Fructidor, Extra

パラメータ

jday

変換したいユリウス積算日。

calendar

月名を取得する暦。

返り値

指定したユリウス積算日と calendar にもとづく月名を返します。

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User Contributed Notes 1 note

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3
marc at linkitdesign dot com
6 years ago
Regarding the jewish date system. It may be worth noting the following peculiarities, some obvious some not so.
1. Jewish days start at sunset NOT midnight so when converting from a Gregorian date to a Jewish one it might be worth asking if the date/time occurred 'after sunset'.
2. Jewish leap years follow a 19 year cycle which can be calculated like this:
function isJLeapYear($JYear) {
    if ( ((7 * $JYear + 1) % 19) < 7 )
        return true;
    else
        return false;
}
3. During a leap year a new leap-month called "Adar I" is inserted BEFORE the normal month of Adar.
4. During leap years, Adar is renamed "Adar II".
5. Adar/Adar II has 29 days
6. Adar I has 30 days
7. Cheshvan & Kislev have between 29 & 30 Days
8. Leap years have between 383 and 385 days.
8. non-leap years have between 353 and 355 days.
9 . In a 354-day year, months have alternating 30 and 29 day lengths.
10. In a 353-day year, the month of Kislev is reduced to 29 days.
11. In a 355-day year, the month of Cheshvan is increased to 30 days.
12. Leap years years follow the same pattern, with the addition of the 30-day Adar I as well.
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