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 — Convertir un calendario soportado a la Fecha Juliana
cal_to_jd() calcula la Fecha Juliana
para una fecha en el calendario calendar especificado.
Los calendarios calendar soportados son
CAL_GREGORIAN,
CAL_JULIAN,
CAL_JEWISH y
CAL_FRENCH.
calendar
El calendario desde el que se va a hacer la conversión,
CAL_GREGORIAN,
CAL_JULIAN,
CAL_JEWISH o
CAL_FRENCH.
month
El mes como número, el rango válido depende de calendar
day
El día como número, el rango válido depende de calendar
year
El año como número, el rango válido depende de calendar
Un número de día de la Fecha Juliana.
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.