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83 lines
2.5 KiB
Fortran
83 lines
2.5 KiB
Fortran
SUBROUTINE sla_CALYD (IY, IM, ID, NY, ND, J)
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*+
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* - - - - - -
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* C A L Y D
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* - - - - - -
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*
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* Gregorian calendar date to year and day in year (in a Julian
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* calendar aligned to the 20th/21st century Gregorian calendar).
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*
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* (Includes century default feature: use sla_CLYD 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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* (year may optionally omit the century)
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* Returned:
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* NY int year (re-aligned Julian calendar)
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* ND int day in year (1 = January 1st)
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* J int status:
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* 0 = OK
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* 1 = bad year (before -4711)
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* 2 = bad month
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* 3 = bad day (but conversion performed)
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*
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* Notes:
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*
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* 1 This routine exists to support the low-precision routines
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* sla_EARTH, sla_MOON and sla_ECOR.
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*
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* 2 Between 1900 March 1 and 2100 February 28 it returns answers
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* which are consistent with the ordinary Gregorian calendar.
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* Outside this range there will be a discrepancy which increases
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* by one day for every non-leap century year.
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*
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* 3 Years in the range 50-99 are interpreted as 1950-1999, and
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* years in the range 00-49 are interpreted as 2000-2049.
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*
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* Called: sla_CLYD
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*
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* P.T.Wallace Starlink 23 November 1994
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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,NY,ND,J
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INTEGER I
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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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I=IY+2000
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ELSE IF (IY.GE.50.AND.IY.LE.99) THEN
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I=IY+1900
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ELSE
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I=IY
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END IF
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* Perform the conversion
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CALL sla_CLYD(I,IM,ID,NY,ND,J)
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END
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