cal_to_jd
(PHP 4 >= 4.0.7, PHP 5)
cal_to_jd — Converts from a supported calendar to Julian Day Count
Описание
int cal_to_jd
( int $calendar
, int $month
, int $day
, int $year
)
cal_to_jd() calculates the Julian day count for a date in the specified calendar . Supported calendar s are CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH and CAL_FRENCH.
Список параметров
- calendar
-
Calendar to convert from, one of CAL_GREGORIAN, CAL_JULIAN, CAL_JEWISH or CAL_FRENCH.
- month
-
The month as a number, the valid range depends on the calendar
- day
-
The day as a number, the valid range depends on the calendar
- year
-
The year as a number, the valid range depends on the calendar
Возвращаемые значения
A Julian Day number.
Коментарии
Julian days begin at noon, while the days of the Gregorian and Julian calendars are usually thought of as beginning at midnight. For the Gregorian and Julian calendars, the function behaves as if the conversion were performed at noon.The earliest supported date in the Julian calendar is January 2, 4713 BC. The corresponding Julian day count is 1. PHP treats -4713 as equal to 4713 BC, and does not allow the year 0; this practice is different than the custom of astronomers, who treat -4712 as equal to 4713 BC.