87 lines
1.4 KiB
C
87 lines
1.4 KiB
C
#include <u.h>
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#include <libc.h>
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int uflg, nflg, iflg, tflg;
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char*
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isodate(Tm *t)
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{
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static char c[10+14+1]; /* leave room to append isotime */
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ct_numb(c, t->year / 100 + 119);
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ct_numb(c+2, t->year % 100 + 100);
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c[4] = '-';
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ct_numb(c+5, t->mon + 101);
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c[7] = '-';
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ct_numb(c+8, t->mday + 100);
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c[10] = 0;
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return c;
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}
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char*
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isotime(Tm *t)
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{
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int tz;
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char *c, *d;
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d = isodate(t);
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c = d + 10; /* append to isodate */
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c[0] = 'T';
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ct_numb(c+1, t->hour+100);
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c[3] = ':';
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ct_numb(c+4, t->min+100);
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c[6] = ':';
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ct_numb(c+7, t->sec+100);
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tz = t->tzoff / 60;
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if(t->tzoff) {
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/* localtime */
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if (t->tzoff > 0) {
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c[9] = '+';
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} else {
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c[9] = '-';
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tz = -tz;
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}
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ct_numb(c+10, tz / 60 + 100);
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ct_numb(c+12, tz % 60 + 100);
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c[14] = 0;
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} else {
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c[9] = 'Z';
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c[10] = 0;
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}
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return d;
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}
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void
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main(int argc, char *argv[])
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{
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ulong now;
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Tm *tm;
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ARGBEGIN{
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case 'n': nflg = 1; break;
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case 'u': uflg = 1; break;
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case 't': tflg = 1; /* implies -i */
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case 'i': iflg = 1; break;
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default: fprint(2, "usage: date [-itun] [seconds]\n"); exits("usage");
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}ARGEND
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if(argc == 1)
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now = strtoul(*argv, 0, 0);
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else
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now = time(0);
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if(nflg)
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print("%ld\n", now);
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else if(iflg) {
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tm = uflg ? gmtime(now) : localtime(now);
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if(tflg)
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print("%s\n", isotime(tm));
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else
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print("%s\n", isodate(tm));
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} else {
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if(uflg)
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print("%s", asctime(gmtime(now)));
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else
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print("%s", ctime(now));
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}
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exits(0);
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}
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