1 /* date - print or set the system date and time
2 Copyright (C) 89, 90, 91, 92, 93, 94, 95, 96, 1997
3 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2, or (at your option)
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software Foundation,
17 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 David MacKenzie <djm@gnu.ai.mit.edu> */
24 #include <sys/types.h>
42 static void show_date __P ((const char *format, time_t when));
43 static void usage __P ((int status));
45 /* The name this program was run with, for error messages. */
48 /* If nonzero, display usage information and exit. */
51 /* If nonzero, print the version on standard output and exit. */
52 static int show_version;
54 /* If non-zero, display time in RFC-822 format for mail or news. */
55 static int rfc_format = 0;
57 /* If nonzero, print or set Coordinated Universal Time. */
58 static int universal_time = 0;
60 static struct option const long_options[] =
62 {"date", required_argument, NULL, 'd'},
63 {"file", required_argument, NULL, 'f'},
64 {"help", no_argument, &show_help, 1},
65 {"reference", required_argument, NULL, 'r'},
66 {"rfc-822", no_argument, NULL, 'R'},
67 {"set", required_argument, NULL, 's'},
68 {"uct", no_argument, NULL, 'u'},
69 {"utc", no_argument, NULL, 'u'},
70 {"universal", no_argument, NULL, 'u'},
71 {"version", no_argument, &show_version, 1},
75 /* Parse each line in INPUT_FILENAME as with --date and display the
76 each resulting time and date. If the file cannot be opened, tell why
77 then exit. Issue a diagnostic for any lines that cannot be parsed.
78 If any line cannot be parsed, return nonzero; otherwise return zero. */
81 batch_convert (const char *input_filename, const char *format)
90 if (strcmp (input_filename, "-") == 0)
92 input_filename = _("standard input");
97 in_stream = fopen (input_filename, "r");
98 if (in_stream == NULL)
100 error (1, errno, "`%s'", input_filename);
110 line_length = getline (&line, &buflen, in_stream);
113 /* FIXME: detect/handle error here. */
116 when = get_date (line, NULL);
119 if (line[line_length - 1] == '\n')
120 line[line_length - 1] = '\0';
121 error (0, 0, _("invalid date ` %s'"), line);
126 show_date (format, when);
130 if (fclose (in_stream) == EOF)
131 error (2, errno, input_filename);
140 main (int argc, char **argv)
143 const char *datestr = NULL;
144 const char *set_datestr = NULL;
148 char *batch_file = NULL;
149 char *reference = NULL;
150 struct stat refstats;
153 int option_specified_date;
155 program_name = argv[0];
156 setlocale (LC_ALL, "");
157 bindtextdomain (PACKAGE, LOCALEDIR);
158 textdomain (PACKAGE);
160 while ((optc = getopt_long (argc, argv, "d:f:r:Rs:u", long_options, NULL))
179 set_datestr = optarg;
184 if (putenv ("TZ=UTC0") != 0)
185 error (1, 0, "memory exhausted");
196 printf ("date (%s) %s\n", GNU_PACKAGE, VERSION);
203 n_args = argc - optind;
205 option_specified_date = ((datestr ? 1 : 0)
206 + (batch_file ? 1 : 0)
207 + (reference ? 1 : 0));
209 if (option_specified_date > 1)
212 _("the options to specify dates for printing are mutually exclusive"));
216 if (set_date && option_specified_date)
219 _("the options to print and set the time may not be used together"));
225 error (0, 0, _("too many non-option arguments"));
229 if ((set_date || option_specified_date)
230 && n_args == 1 && argv[optind][0] != '+')
233 the argument `%s' lacks a leading `+';\n\
234 When using an option to specify date(s), any non-option\n\
235 argument must be a format string beginning with `+'."),
241 datestr = set_datestr;
243 if (batch_file != NULL)
245 status = batch_convert (batch_file,
246 (n_args == 1 ? argv[optind] + 1 : NULL));
252 if (!option_specified_date && !set_date)
254 if (n_args == 1 && argv[optind][0] != '+')
256 /* Prepare to set system clock to the specified date/time
257 given in the POSIX-format. */
259 datestr = argv[optind];
260 when = posixtime (datestr);
265 /* Prepare to print the current date/time. */
266 datestr = _("undefined");
268 format = (n_args == 1 ? argv[optind] + 1 : NULL);
273 /* (option_specified_date || set_date) */
274 if (reference != NULL)
276 if (stat (reference, &refstats))
277 error (1, errno, "%s", reference);
278 when = refstats.st_mtime;
281 when = get_date (datestr, NULL);
282 format = (n_args == 1 ? argv[optind] + 1 : NULL);
286 error (1, 0, _("invalid date `%s'"), datestr);
290 /* Set the system clock to the specified date, then regardless of
291 the success of that operation, format and print that date. */
292 if (stime (&when) == -1)
293 error (0, errno, _("cannot set date"));
296 show_date (format, when);
299 if (fclose (stdout) == EOF)
300 error (2, errno, _("write error"));
305 /* Display the date and/or time in WHEN according to the format specified
306 in FORMAT, followed by a newline. If FORMAT is NULL, use the
307 standard output format (ctime style but with a timezone inserted). */
310 show_date (const char *format, time_t when)
314 size_t out_length = 0;
316 tm = localtime (&when);
320 /* Print the date in the default format. Vanilla ANSI C strftime
321 doesn't support %e, but POSIX requires it. If you don't use
322 a GNU strftime, make sure yours supports %e.
323 If you are not using GNU strftime, you want to change %z
324 in the RFC format to %Z; this gives, however, an invalid
325 RFC time format outside the continental United States and GMT. */
329 ? "%a, %_d %b %Y %H:%M:%S GMT"
330 : "%a, %_d %b %Y %H:%M:%S %z")
331 : "%a %b %e %H:%M:%S %Z %Y");
333 else if (*format == '\0')
342 out = (char *) xrealloc (out, out_length);
344 while (strftime (out, out_length, format, tm) == 0);
346 printf ("%s\n", out);
354 fprintf (stderr, _("Try `%s --help' for more information.\n"),
359 Usage: %s [OPTION]... [+FORMAT]\n\
360 or: %s [OPTION] [MMDDhhmm[[CC]YY][.ss]]\n\
362 program_name, program_name);
364 Display the current time in the given FORMAT, or set the system date.\n\
366 -d, --date=STRING display time described by STRING, not `now'\n\
367 -f, --file=DATEFILE like --date once for each line of DATEFILE\n\
368 -r, --reference=FILE display the last modification time of FILE\n\
369 -R, --rfc-822 output RFC-822 compliant date string\n\
370 -s, --set=STRING set time described by STRING\n\
371 -u, --utc, --universal print or set Coordinated Universal Time\n\
372 --help display this help and exit\n\
373 --version output version information and exit\n\
377 FORMAT controls the output. The only valid option for the second form\n\
378 specifies Coordinated Universal Time. Interpreted sequences are:\n\
381 %%a locale's abbreviated weekday name (Sun..Sat)\n\
382 %%A locale's full weekday name, variable length (Sunday..Saturday)\n\
383 %%b locale's abbreviated month name (Jan..Dec)\n\
384 %%B locale's full month name, variable length (January..December)\n\
385 %%c locale's date and time (Sat Nov 04 12:02:33 EST 1989)\n\
386 %%d day of month (01..31)\n\
387 %%D date (mm/dd/yy)\n\
388 %%e day of month, blank padded ( 1..31)\n\
392 %%j day of year (001..366)\n\
395 %%m month (01..12)\n\
396 %%M minute (00..59)\n\
398 %%p locale's AM or PM\n\
399 %%r time, 12-hour (hh:mm:ss [AP]M)\n\
400 %%s seconds since 00:00:00, Jan 1, 1970 (a GNU extension)\n\
401 %%S second (00..61)\n\
402 %%t a horizontal tab\n\
403 %%T time, 24-hour (hh:mm:ss)\n\
404 %%U week number of year with Sunday as first day of week (00..53)\n\
405 %%V week number of year with Monday as first day of week (01..52)\n\
406 %%w day of week (0..6); 0 represents Sunday\n\
407 %%W week number of year with Monday as first day of week (00..53)\n\
408 %%x locale's date representation (mm/dd/yy)\n\
409 %%X locale's time representation (%%H:%%M:%%S)\n\
410 %%y last two digits of year (00..99)\n\
411 %%Y year (1970...)\n\
412 %%z RFC-822 style numeric timezone (-0500) (a nonstandard extension)\n\
413 %%Z time zone (e.g., EDT), or nothing if no time zone is determinable\n\
415 By default, date pads numeric fields with zeroes. GNU date recognizes\n\
416 the following modifiers between `%%' and a numeric directive.\n\
418 `-' (hyphen) do not pad the field\n\
419 `_' (underscore) pad the field with spaces\n\
421 puts (_("\nReport bugs to <sh-utils-bugs@gnu.ai.mit.edu>."));