Dutch PHP Conference 2019

jdmonthname

(PHP 4, PHP 5, PHP 7)

jdmonthnameReturns a month name

Description

string jdmonthname ( int $julianday , int $mode )

Returns a string containing a month name. mode tells this function which calendar to convert the Julian Day Count to, and what type of month names are to be returned.

Calendar modes
Mode Meaning Values
CAL_MONTH_GREGORIAN_SHORT Gregorian - abbreviated Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
CAL_MONTH_GREGORIAN_LONG Gregorian January, February, March, April, May, June, July, August, September, October, November, December
CAL_MONTH_JULIAN_SHORT Julian - abbreviated Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
CAL_MONTH_JULIAN_LONG Julian January, February, March, April, May, June, July, August, September, October, November, December
CAL_MONTH_JEWISH Jewish Tishri, Heshvan, Kislev, Tevet, Shevat, AdarI, AdarII, Nisan, Iyyar, Sivan, Tammuz, Av, Elul
CAL_MONTH_FRENCH French Republican Vendemiaire, Brumaire, Frimaire, Nivose, Pluviose, Ventose, Germinal, Floreal, Prairial, Messidor, Thermidor, Fructidor, Extra

Parameters

jday

The Julian Day to operate on

mode

The calendar mode (see table above).

Return Values

The month name for the given Julian Day and mode.

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User Contributed Notes 1 note

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marc at linkitdesign dot com
5 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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