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Add -u option to date (POSIX and Plan 9, and useful)
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parent
3863ccdf98
commit
c018f86fc7
4
date.1
4
date.1
@ -5,6 +5,7 @@ date \- print date and time
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.B date
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.B date
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.RB [ \-d
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.RB [ \-d
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.IR time ]
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.IR time ]
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.RB [ \-u ]
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.RI [+ format ]
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.RI [+ format ]
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.SH DESCRIPTION
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.SH DESCRIPTION
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.B date
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.B date
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@ -18,5 +19,8 @@ is given it is used to format the date as per
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prints
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prints
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.I time
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.I time
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instead of the system time, given as the number of seconds since the Unix epoch.
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instead of the system time, given as the number of seconds since the Unix epoch.
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.TP
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.B \-u
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prints UTC time instead of local time.
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.SH SEE ALSO
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.SH SEE ALSO
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.IR strftime (3)
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.IR strftime (3)
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12
date.c
12
date.c
@ -11,21 +11,27 @@ main(int argc, char *argv[])
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char buf[BUFSIZ], c;
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char buf[BUFSIZ], c;
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char *fmt = "%c";
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char *fmt = "%c";
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struct tm *now = NULL;
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struct tm *now = NULL;
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struct tm *(*tztime)(const time_t *) = localtime;
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const char *tz = "local";
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time_t t;
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time_t t;
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t = time(NULL);
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t = time(NULL);
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while((c = getopt(argc, argv, "d:")) != -1)
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while((c = getopt(argc, argv, "d:u")) != -1)
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switch(c) {
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switch(c) {
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case 'd':
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case 'd':
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t = estrtol(optarg, 0);
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t = estrtol(optarg, 0);
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break;
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break;
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case 'u':
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tztime = gmtime;
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tz = "gm";
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break;
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default:
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default:
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exit(EXIT_FAILURE);
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exit(EXIT_FAILURE);
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}
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}
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if(optind < argc && argv[optind][0] == '+')
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if(optind < argc && argv[optind][0] == '+')
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fmt = &argv[optind][1];
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fmt = &argv[optind][1];
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if(!(now = localtime(&t)))
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if(!(now = tztime(&t)))
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eprintf("localtime failed\n");
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eprintf("%stime failed\n", tz);
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strftime(buf, sizeof buf, fmt, now);
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strftime(buf, sizeof buf, fmt, now);
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puts(buf);
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puts(buf);
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