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/*
*+
* Name:
* palDat
* Purpose:
* Return offset between UTC and TAI
* Language:
* Starlink ANSI C
* Type of Module:
* Library routine
* Invocation:
* dat = palDat( double utc );
* Arguments:
* utc = double (Given)
* UTC date as a modified JD (JD-2400000.5)
* Returned Value:
* dat = double
* TAI-UTC in seconds
* Description:
* Increment to be applied to Coordinated Universal Time UTC to give
* International Atomic Time (TAI).
* Authors:
* TIMJ: Tim Jenness (JAC, Hawaii)
* {enter_new_authors_here}
* Notes:
* - This routine converts the MJD argument to calendar date before calling
* the SOFA/ERFA eraDat function.
* - This routine matches the slaDat interface which differs from the eraDat
* interface. Consider coding directly to the SOFA/ERFA interface.
* - See eraDat for a description of error conditions when calling this function
* with a time outside of the UTC range.
* - The status argument from eraDat is ignored. This is reasonable since the
* error codes are mainly related to incorrect calendar dates when calculating
* the JD internally.
* History:
* 2012-02-08 (TIMJ):
* Initial version
* Adapted with permission from the Fortran SLALIB library
* although the core algorithm is now from SOFA.
* {enter_further_changes_here}
* Copyright:
* 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 "pal.h"
#include "palmac.h"
#include "pal1sofa.h"
double palDat ( double dju ) {
int iy;
int im;
int id;
int status;
double fd;
double deltat;
eraJd2cal( PAL__MJD0, dju,
&iy, &im, &id, &fd );
status = eraDat( iy, im, id, fd, &deltat );
return deltat;
}
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