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SUBROUTINE sla_DJCL (DJM, IY, IM, ID, FD, J)
*+
* - - - - -
* D J C L
* - - - - -
*
* Modified Julian Date to Gregorian year, month, day,
* and fraction of a day.
*
* Given:
* DJM dp modified Julian Date (JD-2400000.5)
*
* Returned:
* IY int year
* IM int month
* ID int day
* FD dp fraction of day
* J int status:
* 0 = OK
* -1 = unacceptable date (before 4701BC March 1)
*
* The algorithm is adapted from Hatcher 1984 (QJRAS 25, 53-55).
*
* Last revision: 22 July 2004
*
* Copyright P.T.Wallace. All rights reserved.
*
* 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
DOUBLE PRECISION DJM
INTEGER IY,IM,ID
DOUBLE PRECISION FD
INTEGER J
DOUBLE PRECISION F,D
INTEGER JD,N4,ND10
* Check if date is acceptable.
IF ( DJM.LE.-2395520D0 .OR. DJM.GE.1D9 ) THEN
J = -1
ELSE
J = 0
* Separate day and fraction.
F = MOD(DJM,1D0)
IF (F.LT.0D0) F = F+1D0
D = ANINT(DJM-F)
* Express day in Gregorian calendar.
JD = NINT(D)+2400001
N4 = 4*(JD+((6*((4*JD-17918)/146097))/4+1)/2-37)
ND10 = 10*(MOD(N4-237,1461)/4)+5
IY = N4/1461-4712
IM = MOD(ND10/306+2,12)+1
ID = MOD(ND10,306)/10+1
FD = F
J=0
END IF
END
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