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This article explains the PHP function unixtojd, which converts a given Unix timestamp into its corresponding Julian Day number, returning the current day's count when no timestamp is supplied, and details its parameter and return value.
The jdtounix function takes a Julian Day number within the range 2440588‑2465342 and returns the corresponding Unix timestamp for the start of that day in local time, or FALSE if the value falls outside the supported Gregorian years 1970‑2037.
This article presents a PHP function named jdtofrench that accepts an integer Julian Day count and returns the corresponding date formatted as month/day/year in the French Republican calendar, detailing its parameter and return value for backend developers.
This article explains the PHP gregoriantojd function, detailing its purpose of converting Gregorian calendar dates within the range 4714 B.C. to 9999 A.D. into Julian Day numbers, and describes its parameters, valid ranges, historical context, and return value.
This article explains the PHP function FrenchToJD, which converts a date from the French Republican calendar (year 1‑14, month 1‑13, day 1‑30) into the corresponding Julian Day count, detailing its parameters, valid ranges, and return value.
The cal_to_jd() function in PHP calculates the Julian Day count from a given date, supporting Gregorian, Julian, Jewish, and French calendars, and returns the corresponding Julian Day number based on the provided calendar, month, day, and year parameters.