Last change
on this file since 6099cac was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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File size:
564 bytes
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[3ae31e9] | 1 | /*
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| 2 | =============================================================================
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| 3 | weekof.c -- return the Monday of the week a given Julian day is in
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| 4 | Version 1 -- 1988-01-20 -- D.N. Lynx Crowe
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| 5 |
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| 6 | Accepts and returns Julian day numbers as used with jdate() or jday().
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| 7 | =============================================================================
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| 8 | */
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| 9 |
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| 10 | #include "stddefs.h"
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| 11 |
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| 12 | long
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| 13 | weekof(jd)
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| 14 | long jd;
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| 15 | {
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| 16 | short wd;
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| 17 |
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| 18 | wd = (jd + 1L) % 7;
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| 19 |
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| 20 | if (wd EQ 1)
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| 21 | return(jd);
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| 22 | else if (wd)
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| 23 | return(jd - (long)(wd - 1));
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| 24 | else
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| 25 | return(jd - 6L);
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| 26 | }
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