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To find the Julian date number for a given date, with or without a time of day, use a command of this form:
jd datetime
For the syntax of dates and times, see Section 3.1, “Specifying dates and times on command lines”.
As a convenience, you can supply the date and time as two
separate arguments without the “T” separator between them.
Examples:
$ jd 1985-02-17t06:00 2446113.75 $ jd 1985-02-17 6:00 2446113.75 $