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