JewishToJD – Convert a Jewish Calendar Date to a Julian Day Number (PHP)
JewishToJD is a PHP function that converts a given Jewish calendar date—specified by month (1‑13), day (1‑30), and year (1‑9999)—into its corresponding Julian Day count, noting that while it can handle years before 3761 B.C., such calculations are historically meaningless.
JewishToJD is a PHP function that converts a date from the Jewish calendar to its Julian Day number.
The function signature is int jewishtojd(int $month, int $day, int $year), where month must be between 1 and 13, day between 1 and 30, and year between 1 and 9999.
Although the function can process years earlier than 3761 B.C., such calculations are not meaningful because the early Jewish calendar did not have a fixed rule for the start of a month, relying instead on lunar observations.
The function returns the Julian Day count corresponding to the specified Jewish date.
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