#include <u.h>
#include <libc.h>
-int uflg, nflg;
+static char *day[] = {
+ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
+};
+
+static char *mon[] = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul",
+ "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+int uflg, nflg, iflg, tflg, mflg;
+
+char*
+isodate(Tm *t)
+{
+ static char c[26]; /* leave room to append isotime */
+ snprint(c, 11, "%04d-%02d-%02d",
+ t->year + 1900, t->mon + 1, t->mday);
+ return c;
+}
+
+char*
+isotime(Tm *t)
+{
+ int tz;
+ char *c, *d;
+ d = isodate(t);
+ c = d+10;
+ snprint(c, 10, "T%02d:%02d:%02d",
+ t->hour, t->min, t->sec); /* append to isodate */
+ tz = t->tzoff / 60;
+ if(t->tzoff) {
+ /* localtime */
+ if (t->tzoff > 0) {
+ c[9] = '+';
+ } else {
+ c[9] = '-';
+ tz = -tz;
+ }
+ snprint(c+10, 6, "%02d:%02d", tz / 60, tz % 60);
+ } else {
+ c[9] = 'Z';
+ c[10] = 0;
+ }
+ return d;
+}
+
+char *
+mailtime(Tm *t)
+{
+ static char c[64];
+ char *sgn;
+ int off;
+
+ sgn = "+";
+ if(t->tzoff < 0)
+ sgn = "";
+ off = (t->tzoff/3600)*100 + (t->tzoff/60)%60;
+ snprint(c, sizeof(c), "%s, %.2d %s %.4d %.2d:%.2d:%.2d %s%.4d",
+ day[t->wday], t->mday, mon[t->mon], t->year + 1900,
+ t->hour, t->min, t->sec, sgn, off);
+ return c;
+}
void
main(int argc, char *argv[])
{
ulong now;
-
+ Tm *tm;
ARGBEGIN{
case 'n': nflg = 1; break;
case 'u': uflg = 1; break;
- default: fprint(2, "usage: date [-un] [seconds]\n"); exits("usage");
+ case 't': tflg = 1; /* implies -i */
+ case 'i': iflg = 1; break;
+ case 'm': mflg = 1; break;
+ default: fprint(2, "usage: date [-itunm] [seconds]\n"); exits("usage");
}ARGEND
if(argc == 1)
if(nflg)
print("%ld\n", now);
- else if(uflg)
- print("%s", asctime(gmtime(now)));
- else
- print("%s", ctime(now));
-
+ else {
+ tm = uflg ? gmtime(now) : localtime(now);
+ if(iflg) {
+ if(tflg)
+ print("%s\n", isotime(tm));
+ else
+ print("%s\n", isodate(tm));
+ } else if(mflg)
+ print("%s\n", mailtime(tm));
+ else
+ print("%s", asctime(tm));
+ }
exits(0);
}