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jd2cal(jd)
[SOFA] Returns the Gregorian calendar dates corresponding to the
specified Chronological Julian Day Numbers jd. The
result has the same type as jd but not less than
long, and has the same dimensions as jd but with
one extra dimension of size 3 prefixed, for the year, month, and day,
respectively. Unexpected results may be given if CJDNs outside of the
supported range are specified. Julian day numbers before -68569.5 or
after 1e9 yield zeros for the year, month, and day. CJDNs between
536802342 and 1000000000 inclusive yield nonzero yet erroneous results
on systems with 32-bit ints.