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Add -u option to date (POSIX and Plan 9, and useful)

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This commit is contained in:
Robert Ransom 2012-04-23 08:32:24 -07:00
parent 3863ccdf98
commit c018f86fc7
2 changed files with 13 additions and 3 deletions
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4
date.1
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@ -5,6 +5,7 @@ date \- print date and time
.B date
.RB [ \-d
.IR time ]
.RB [ \-u ]
.RI [+ format ]
.SH DESCRIPTION
.B date
@ -18,5 +19,8 @@ is given it is used to format the date as per
prints
.I time
instead of the system time, given as the number of seconds since the Unix epoch.
.TP
.B \-u
prints UTC time instead of local time.
.SH SEE ALSO
.IR strftime (3)

12
date.c
View File

@ -11,21 +11,27 @@ main(int argc, char *argv[])
char buf[BUFSIZ], c;
char *fmt = "%c";
struct tm *now = NULL;
struct tm *(*tztime)(const time_t *) = localtime;
const char *tz = "local";
time_t t;
t = time(NULL);
while((c = getopt(argc, argv, "d:")) != -1)
while((c = getopt(argc, argv, "d:u")) != -1)
switch(c) {
case 'd':
t = estrtol(optarg, 0);
break;
case 'u':
tztime = gmtime;
tz = "gm";
break;
default:
exit(EXIT_FAILURE);
}
if(optind < argc && argv[optind][0] == '+')
fmt = &argv[optind][1];
if(!(now = localtime(&t)))
eprintf("localtime failed\n");
if(!(now = tztime(&t)))
eprintf("%stime failed\n", tz);
strftime(buf, sizeof buf, fmt, now);
puts(buf);