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date.c - 9base - revived minimalist port of Plan 9 userland to Unix
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date.c (1207B)
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1 #include <u.h>
2 #include <libc.h>
3
4 int uflg, nflg, iflg, tflg;
5
6 char*
7 isodate(Tm *t)
8 {
9 static char c[25]; /* leave room to append isotime */
10 snprint(c, 11, "%04d-%02d-%02d",
11 t->year + 1900, t->mon + 1, t->mday);
12 return c;
13 }
14
15 char*
16 isotime(Tm *t)
17 {
18 int tz;
19 char *c, *d;
20 d = isodate(t);
21 c = d+10;
22 snprint(c, 10, "T%02d:%02d:%02d",
23 t->hour, t->min, t->sec); /* append to isodate */
24 tz = t->tzoff / 60;
25 if(t->tzoff) {
26 /* localtime */
27 if (t->tzoff > 0) {
28 c[9] = '+';
29 } else {
30 c[9] = '-';
31 tz = -tz;
32 }
33 snprint(c+10, 5, "%02d%02d", tz / 60, tz % 60);
34 } else {
35 c[9] = 'Z';
36 c[10] = 0;
37 }
38 return d;
39 }
40
41 void
42 main(int argc, char *argv[])
43 {
44 ulong now;
45 Tm *tm;
46 ARGBEGIN{
47 case 'n': nflg = 1; break;
48 case 'u': uflg = 1; break;
49 case 't': tflg = 1; /* implies -i */
50 case 'i': iflg = 1; break;
51 default: fprint(2, "usage: date [-itun] [seconds]\n"); ex…
52 }ARGEND
53
54 if(argc == 1)
55 now = strtoul(*argv, 0, 0);
56 else
57 now = time(0);
58
59 if(nflg)
60 print("%ld\n", now);
61 else {
62 tm = uflg ? gmtime(now) : localtime(now);
63 if(iflg) {
64 if(tflg)
65 print("%s\n", isotime(tm));
66 else
67 print("%s\n", isodate(tm));
68 } else
69 print("%s", asctime(tm));
70 }
71 exits(0);
72 }
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