Julian Date Converter
Convert between calendar dates and Julian Day numbers.
Convert calendar date/time strings and Julian Day (JD) numbers using the same two modes as the JPL SSD converter. The calendar side accepts numeric or named months, day-of-year notation, decimal days, decimal hours/minutes/seconds, and astronomical year numbering.
Accepted calendar formats
Calendar input can use YYYY-MM-DD, YYYY-Mon-DD, or YYYY--DDD. Separate time with a space or underscore.
2000-02-28_13:12:00
2000-Feb-28 13:12
2000-02-28 13.2
2000-02-28.05
2000--59 13:12
Years use astronomical numbering: 0000 is 1 B.C., -001 is 2 B.C., and so on. The supported calendar-input range is -9999-01-01 through 99999-12-31.