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75 lines
2.1 KiB
Fortran
75 lines
2.1 KiB
Fortran
SUBROUTINE sla_CALDJ (IY, IM, ID, DJM, J)
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*+
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* - - - - - -
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* C A L D J
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* - - - - - -
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*
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* Gregorian Calendar to Modified Julian Date
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*
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* (Includes century default feature: use sla_CLDJ for years
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* before 100AD.)
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*
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* Given:
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* IY,IM,ID int year, month, day in Gregorian calendar
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*
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* Returned:
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* DJM dp modified Julian Date (JD-2400000.5) for 0 hrs
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* J int status:
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* 0 = OK
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* 1 = bad year (MJD not computed)
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* 2 = bad month (MJD not computed)
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* 3 = bad day (MJD computed)
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*
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* Acceptable years are 00-49, interpreted as 2000-2049,
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* 50-99, " " 1950-1999,
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* 100 upwards, interpreted literally.
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*
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* Called: sla_CLDJ
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*
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* P.T.Wallace Starlink November 1985
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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INTEGER IY,IM,ID
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DOUBLE PRECISION DJM
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INTEGER J
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INTEGER NY
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* Default century if appropriate
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IF (IY.GE.0.AND.IY.LE.49) THEN
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NY=IY+2000
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ELSE IF (IY.GE.50.AND.IY.LE.99) THEN
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NY=IY+1900
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ELSE
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NY=IY
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END IF
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* Modified Julian Date
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CALL sla_CLDJ(NY,IM,ID,DJM,J)
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END
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