Convert a calendar date to true Julian day


INTERFACE:

    subroutine julian_day(yyyy,mm,dd,julian)
DESCRIPTION:

Converts a calendar date to a Julian day. Based on a similar routine in Numerical Recipes.


USES:

    IMPLICIT NONE
INPUT PARAMETERS:
    integer                             :: yyyy,mm,dd
OUTPUT PARAMETERS:
    integer                             :: julian
REVISION HISTORY:
    Original author(s): Karsten Bolding & Hans Burchard



Karsten Bolding 2012-01-24