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.
(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
cal_to_jd — Convertit un calendrier en nombre de jours Julien
cal_to_jd() calcule le nombre de jours Julien
pour une date, dans le calendrier calendar.
Les valeurs possibles pour calendar sont
CAL_GREGORIAN,
CAL_JULIAN,
CAL_JEWISH et
CAL_FRENCH.
calendar
Calendrier à convertir. Un parmi
CAL_GREGORIAN,
CAL_JULIAN,
CAL_JEWISH ou
CAL_FRENCH.
month
Le mois, sous la forme d'un nombre. L'intervalle valide
dépend du calendrier calendar
day
Le jour, sous la forme d'un nombre. L'intervalle valide
dépend du calendrier calendar
year
L'année, sous la forme d'un nombre. L'intervalle valide
dépend du calendrier calendar
Le nombre de jour Julien.
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.