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diff --git a/ast/pal/palDjcal.c b/ast/pal/palDjcal.c
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+/*
+*+
+*  Name:
+*     palDjcal
+
+*  Purpose:
+*     Modified Julian Date to Gregorian Calendar
+
+*  Language:
+*     Starlink ANSI C
+
+*  Type of Module:
+*     Library routine
+
+*  Invocation:
+*     void palDjcal ( int ndp, double djm, int iymdf[4], int *j );
+
+*  Arguments:
+*     ndp = int (Given)
+*        Number of decimal places of days in fraction.
+*     djm = double (Given)
+*        Modified Julian Date (JD-2400000.5)
+*     iymdf[4] = int[] (Returned)
+*       Year, month, day, fraction in Gregorian calendar.
+*     j = status (Returned)
+*       0 = OK. See eraJd2cal for other values.
+
+*  Description:
+*     Modified Julian Date to Gregorian Calendar, expressed
+*     in a form convenient for formatting messages (namely
+*     rounded to a specified precision, and with the fields
+*     stored in a single array)
+
+*  Authors:
+*     PTW: Pat Wallace (STFC)
+*     TIMJ: Tim Jenness (JAC, Hawaii)
+*     {enter_new_authors_here}
+
+*  History:
+*     2012-02-10 (TIMJ):
+*        Initial version with documentation taken from Fortran SLA
+*        Adapted with permission from the Fortran SLALIB library.
+*     {enter_further_changes_here}
+
+*  Notes:
+*     - Uses eraJd2cal
+
+*  Copyright:
+*     Copyright (C) 2004 Patrick T. Wallace
+*     Copyright (C) 2012 Science and Technology Facilities Council.
+*     All Rights Reserved.
+
+*  Licence:
+*     This program is free software: you can redistribute it and/or
+*     modify it under the terms of the GNU Lesser General Public
+*     License as published by the Free Software Foundation, either
+*     version 3 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 Lesser General Public License for more details.
+*
+*     You should have received a copy of the GNU Lesser General
+*     License along with this program.  If not, see
+*     <http://www.gnu.org/licenses/>.
+
+*  Bugs:
+*     {note_any_bugs_here}
+*-
+*/
+
+#include <math.h>
+
+#include "pal.h"
+#include "palmac.h"
+#include "pal1sofa.h"
+
+void palDjcal ( int ndp, double djm, int iymdf[4], int *j ) {
+  double frac = 0.0;
+  double nfd;
+
+  *j = eraJd2cal( PAL__MJD0, djm, &(iymdf[0]),
+		  &(iymdf[1]), &(iymdf[2]),
+		  &frac);
+
+  /* Convert ndp to a power of 10 */
+  nfd = pow( 10., (double)ndp );
+
+  /* Multiply the fraction */
+  frac *= nfd;
+
+  /* and now we want to round to the nearest integer */
+  iymdf[3] = (int)DNINT(frac);
+
+}