Julian Calendar Today 2025. Mjd calendar or gps calendar or calendar with. Julian dates (abbreviated jd) are simply a contiguous count of days and fractions since noon universal time on 1st january, 4713 bce (on the julian calendar).

Use this tool to convert between date and julian (yyddd) date formats. Use this tool to convert a specified calendar date/time to an equivalent julian day (jd) number.