This program uses a cookie to remember the interface settings between calls.
DATE ISOymd = 20170623 = 2017 06 23 on the Gregorian Calendar
= June23, 2017 (Friday)
JD = 2457928 = 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