idlastro / Astronomical Utilities: YMD2DN

[Source code]

NAME
YMD2DN
PURPOSE
Convert from year and day number of year to month and day of month.
CALLING SEQUENCE
YMD2DN,yr,m,d,dy
INPUTS
yr = 4 digit year (like 1988), integer scalar
m = month number (1-12, e.g. 11 = Nov)
d = day of month (like 5).
OUTPUTS
dy = day number in year (like 310)
MODIFICATION HISTORY
Adapted from ydn2md, Ole Streicher, 2015