1 /* $selId: dow.c,v 2.0 1995/10/24 01:13:06 lees Exp $
2 * Copyright 1993-1995, Scott E. Lee, all rights reserved.
3 * Permission granted to use, copy, modify, distribute and sell so long as
4 * the above copyright and this permission statement are retained in all
5 * copies. THERE IS NO WARRANTY - USE AT YOUR OWN RISK.
6 */
7
8 /**************************************************************************
9 *
10 * These are the externally visible components of this file:
11 *
12 * int
13 * DayOfWeek(
14 * long int sdn);
15 *
16 * Convert a SDN to a day-of-week number (0 to 6). Where 0 stands for
17 * Sunday, 1 for Monday, etc. and 6 stands for Saturday.
18 *
19 * char *DayNameShort[7];
20 *
21 * Convert a day-of-week number (0 to 6), as returned from DayOfWeek(), to
22 * the abbreviated (three character) name of the day.
23 *
24 * char *DayNameLong[7];
25 *
26 * Convert a day-of-week number (0 to 6), as returned from DayOfWeek(), to
27 * the name of the day.
28 *
29 **************************************************************************/
30
31 #include "sdncal.h"
32
DayOfWeek(zend_long sdn)33 int DayOfWeek(
34 zend_long sdn)
35 {
36 int dow;
37
38 dow = (sdn + 1) % 7;
39 if (dow >= 0) {
40 return (dow);
41 } else {
42 return (dow + 7);
43 }
44 }
45
46 const char * const DayNameShort[7] =
47 {
48 "Sun",
49 "Mon",
50 "Tue",
51 "Wed",
52 "Thu",
53 "Fri",
54 "Sat"
55 };
56
57 const char * const DayNameLong[7] =
58 {
59 "Sunday",
60 "Monday",
61 "Tuesday",
62 "Wednesday",
63 "Thursday",
64 "Friday",
65 "Saturday"
66 };
67
