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# PHP jewishtojd() Function [ PHP Calendar Reference](#) ## Example Convert a date from the Jewish calendar to a Julian Day Count: [Run Example »](#) * * * ## Definition and Usage The jewishtojd() function converts a date from the Jewish calendar to a Julian Day Count. **Note:** The valid date range handled by this function starts from the year 3761 BC in the Jewish calendar. The Jewish calendar has existed for thousands of years, but early on, there was no formulated method for calculating the start of the month. The first month of each year was determined by the first sighting of the new moon. **Tip:** See the [jdtojewish()](#) function to convert a Julian Day Count back to a date in the Jewish calendar. ## Syntax jewishtojd(_month,day,year);_ | Parameter | Description | | :--- | :--- | | _month_ | Required. A number from 1 to 13 specifying the month. | | _day_ | Required. A number from 1 to 30 specifying the day. | | _year_ | Required. A number from 1 to 9999 specifying the year. | ## Technical Details | Return Value: | Returns the Julian Day number. | | :--- | | PHP Version: | 4+ | * * PHP Calendar Reference](#)