copy

slalib/caldj.f

@@ -0,0 +1,74 @@
+      SUBROUTINE sla_CALDJ (IY, IM, ID, DJM, J)
+*+
+*     - - - - - -
+*      C A L D J
+*     - - - - - -
+*
+*  Gregorian Calendar to Modified Julian Date
+*
+*  (Includes century default feature:  use sla_CLDJ for years
+*   before 100AD.)
+*
+*  Given:
+*     IY,IM,ID     int    year, month, day in Gregorian calendar
+*
+*  Returned:
+*     DJM          dp     modified Julian Date (JD-2400000.5) for 0 hrs
+*     J            int    status:
+*                           0 = OK
+*                           1 = bad year   (MJD not computed)
+*                           2 = bad month  (MJD not computed)
+*                           3 = bad day    (MJD computed)
+*
+*  Acceptable years are 00-49, interpreted as 2000-2049,
+*                       50-99,     "       "  1950-1999,
+*                       100 upwards, interpreted literally.
+*
+*  Called:  sla_CLDJ
+*
+*  P.T.Wallace   Starlink   November 1985
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*
+*  License:
+*    This program is free software; you can redistribute it and/or modify
+*    it under the terms of the GNU General Public License as published by
+*    the Free Software Foundation; either version 2 of the License, or
+*    (at your option) any later version.
+*
+*    This program is distributed in the hope that it will be useful,
+*    but WITHOUT ANY WARRANTY; without even the implied warranty of
+*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+*    GNU General Public License for more details.
+*
+*    You should have received a copy of the GNU General Public License
+*    along with this program (see SLA_CONDITIONS); if not, write to the 
+*    Free Software Foundation, Inc., 59 Temple Place, Suite 330, 
+*    Boston, MA  02111-1307  USA
+*
+*-
+
+      IMPLICIT NONE
+
+      INTEGER IY,IM,ID
+      DOUBLE PRECISION DJM
+      INTEGER J
+
+      INTEGER NY
+
+
+
+
+*  Default century if appropriate
+      IF (IY.GE.0.AND.IY.LE.49) THEN
+         NY=IY+2000
+      ELSE IF (IY.GE.50.AND.IY.LE.99) THEN
+         NY=IY+1900
+      ELSE
+         NY=IY
+      END IF
+
+*  Modified Julian Date
+      CALL sla_CLDJ(NY,IM,ID,DJM,J)
+
+      END