sys/src/cmd/date.c

   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"); exits("usage");
  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 }