Convert Julian date to UT1 year, month, and date.
Date for 0h, UT1, with class POSIXct
Fliegel & Van Flandern, Comm. ACM 10, 657 (1968), whose algorithm
uses FORTRAN integer mathematics
jd2ymd(2456092.5) # returns 0h date, 2012-06-14 UT
jd2ymd(2456092.6) # returns 0h date, 2012-06-14 UT
jd2ymd(2456092.4) # returns 0h date, 2012-06-13 UT
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