jddate.py

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def jddate(jd):
    #   This routine computes the calendar date corresponding to
    #   a given Julian day.  This code was brazenly copied from
    #   a routine written by Myron Shear for CSC on Julian Day 1.
    #   
    #   ARGUMENT    TYPE    I//O    DESCRIPTION 
    #   __________________________________________________________
    #    JD     I*4  I  Julian Day (reference Jan 1, 4713 BC)
    #    I      I*4  O  Year 
    #    J      I*4  O  Month   
    #    K      I*4  O  Day of Month
 
    l = jd + 68569
    n = 4*l//146097
    l = l - (146097*n + 3)//4
    i = 4000*(l+1)//1461001
    l = l - 1461*i//4 + 31
    j = 80*l//2447
    k = l - 2447*j//80
    l = j//11
    j = j + 2 - 12*l
    i = 100*(n-49) + i + l
    return i,j,k