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	date.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	---
	date.c (1207B)
	---
	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 }