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Add -i flag to date: prints ISO-8601 datestamp

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Add -t flag to date: prints ISO-8601 timestamp
This commit is contained in:
google 2012-09-02 00:33:39 +12:00
parent 87b6b93257
commit 2dfe66d72f
2 changed files with 70 additions and 8 deletions
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6
sys/man/1/date
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@ -24,6 +24,12 @@ Report Greenwich Mean Time (GMT) rather than local time.
.B -n
Report the date as the number of seconds since the
epoch, 00:00:00 GMT, January 1, 1970.
.TP
.B -i
Report the date as ISO-8601 without time and timezone suffix.
.TP
.B -t
Report the date as ISO-8601 with time and timezone suffix.
.PP
The conversion from Greenwich Mean Time to local time depends on the
.B $timezone

72
sys/src/cmd/date.c
View file

@ -1,17 +1,66 @@
#include <u.h>
#include <libc.h>
int uflg, nflg;
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;
default: fprint(2, "usage: date [-un] [seconds]\n"); exits("usage");
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)
@ -21,10 +70,17 @@ main(int argc, char *argv[])
if(nflg)
print("%ld\n", now);
else if(uflg)
print("%s", asctime(gmtime(now)));
else
print("%s", ctime(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);
}