c3af90c6c7
RFC3339 is a stricter subset of ISO 8601, in particular the timezone offset needs to be specified as +HH:MM while in ISO 8601 the colon is optional.
102 lines
1.8 KiB
C
102 lines
1.8 KiB
C
#include <u.h>
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#include <libc.h>
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static char *day[] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
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};
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static char *mon[] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
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"Aug", "Sep", "Oct", "Nov", "Dec"
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};
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int uflg, nflg, iflg, tflg, mflg;
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char*
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isodate(Tm *t)
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{
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static char c[26]; /* leave room to append isotime */
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snprint(c, 11, "%04d-%02d-%02d",
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t->year + 1900, t->mon + 1, t->mday);
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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;
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snprint(c, 10, "T%02d:%02d:%02d",
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t->hour, t->min, t->sec); /* append to isodate */
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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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snprint(c+10, 6, "%02d:%02d", tz / 60, tz % 60);
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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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char *
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mailtime(Tm *t)
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{
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static char c[64];
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char *sgn;
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int off;
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sgn = "+";
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if(t->tzoff < 0)
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sgn = "";
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off = (t->tzoff/3600)*100 + (t->tzoff/60)%60;
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snprint(c, sizeof(c), "%s, %.2d %s %.4d %.2d:%.2d:%.2d %s%.4d",
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day[t->wday], t->mday, mon[t->mon], t->year + 1900,
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t->hour, t->min, t->sec, sgn, off);
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return c;
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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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case 'm': mflg = 1; break;
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default: fprint(2, "usage: date [-itunm] [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 {
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tm = uflg ? gmtime(now) : localtime(now);
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if(iflg) {
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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 if(mflg)
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print("%s\n", mailtime(tm));
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else
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print("%s", asctime(tm));
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}
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exits(0);
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}
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