| 1 | /*
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| 2 | *+
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| 3 | * Name:
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| 4 | * palCaldj
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| 5 |
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| 6 | * Purpose:
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| 7 | * Gregorian Calendar to Modified Julian Date
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| 8 |
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| 9 | * Language:
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| 10 | * Starlink ANSI C
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| 11 |
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| 12 | * Type of Module:
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| 13 | * Library routine
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| 14 |
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| 15 | * Invocation:
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| 16 | * void palCaldj ( int iy, int im, int id, double *djm, int *j );
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| 17 |
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| 18 | * Arguments:
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| 19 | * iy = int (Given)
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| 20 | * Year in the Gregorian calendar
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| 21 | * im = int (Given)
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| 22 | * Month in the Gergorian calendar
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| 23 | * id = int (Given)
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| 24 | * Day in the Gregorian calendar
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| 25 | * djm = double * (Returned)
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| 26 | * Modified Julian Date (JD-2400000.5) for 0 hrs
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| 27 | * j = status (Returned)
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| 28 | * 0 = OK. See eraCal2jd for other values.
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| 29 |
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| 30 | * Description:
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| 31 | * Modified Julian Date to Gregorian Calendar with special
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| 32 | * behaviour for 2-digit years relating to 1950 to 2049.
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| 33 |
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| 34 | * Authors:
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| 35 | * PTW: Pat Wallace (STFC)
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| 36 | * TIMJ: Tim Jenness (JAC, Hawaii)
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| 37 | * {enter_new_authors_here}
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| 38 |
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| 39 | * History:
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| 40 | * 2012-02-11 (TIMJ):
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| 41 | * Initial version with documentation taken from Fortran SLA
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| 42 | * Adapted with permission from the Fortran SLALIB library.
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| 43 | * {enter_further_changes_here}
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| 44 |
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| 45 | * Notes:
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| 46 | * - Uses eraCal2jd
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| 47 | * - Unlike eraCal2jd this routine treats the years 0-100 as
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| 48 | * referring to the end of the 20th Century and beginning of
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| 49 | * the 21st Century. If this behaviour is not acceptable
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| 50 | * use the SOFA/ERFA routine directly or palCldj.
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| 51 | * Acceptable years are 00-49, interpreted as 2000-2049,
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| 52 | * 50-99, " " 1950-1999,
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| 53 | * all others, interpreted literally.
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| 54 | * - Unlike SLA this routine will work with negative years.
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| 55 |
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| 56 |
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| 57 | * Copyright:
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| 58 | * Copyright (C) 1995 Rutherford Appleton Laboratory
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| 59 | * Copyright (C) 2012 Science and Technology Facilities Council.
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| 60 | * All Rights Reserved.
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| 61 |
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| 62 | * Licence:
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| 63 | * This program is free software: you can redistribute it and/or
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| 64 | * modify it under the terms of the GNU Lesser General Public
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| 65 | * License as published by the Free Software Foundation, either
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| 66 | * version 3 of the License, or (at your option) any later
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| 67 | * version.
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| 68 | *
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| 69 | * This program is distributed in the hope that it will be useful,
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| 70 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 71 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 72 | * GNU Lesser General Public License for more details.
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| 73 | *
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| 74 | * You should have received a copy of the GNU Lesser General
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| 75 | * License along with this program. If not, see
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| 76 | * <http://www.gnu.org/licenses/>.
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| 77 |
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| 78 | * Bugs:
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| 79 | * {note_any_bugs_here}
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| 80 | *-
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| 81 | */
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| 82 |
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| 83 | #include "pal.h"
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| 84 | #include "palmac.h"
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| 85 | #include "pal1sofa.h"
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| 86 |
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| 87 | void palCaldj ( int iy, int im, int id, double *djm, int *j ) {
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| 88 | int adj = 0; /* Year adjustment */
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| 89 | double djm0;
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| 90 |
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| 91 | if (iy >= 0 && iy <= 49) {
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| 92 | adj = 2000;
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| 93 | } else if (iy >= 50 && iy <= 99) {
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| 94 | adj = 1900;
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| 95 | }
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| 96 | iy += adj;
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| 97 |
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| 98 | *j = eraCal2jd( iy, im, id, &djm0, djm );
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| 99 | }
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