Julian Date Converter
Convert a calendar date to Julian Day Number, Julian Date, Modified Julian Date, day of year and ISO week, free online.
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The Julian Day Number counts days continuously since 1 January 4713 BC (noon UTC). The Julian Date at 00:00 UTC is the JDN minus 0.5, and the Modified Julian Date is JD − 2,400,000.5. Astronomers and programmers use these to compute date differences easily.