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DATE ISOymd = 20170429 = 2017 04 29 on the Gregorian Calendar
= April29, 2017 (Saturday)
JD = 2457873 = Standard Calendrical JD number for Gregorian date
Gregorian Calendar Date = Julian Date + 13 days
Note that the corresponding days of the week are the same on both
calendars no matter the number of days difference between them.
© Jay Tanner - PHP Science Labs - 2017 - v1.01