1 /* date - print or set the system date and time
2 Copyright (C) 1989-1999 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 David MacKenzie <djm@gnu.ai.mit.edu> */
23 #include <sys/types.h>
30 #include "long-options.h"
43 static void show_date PARAMS ((const char *format, time_t when));
45 /* The name this program was run with, for error messages. */
48 /* If non-zero, display time in RFC-822 format for mail or news. */
49 static int rfc_format = 0;
51 /* If nonzero, print or set Coordinated Universal Time. */
52 static int universal_time = 0;
54 static struct option const long_options[] =
56 {"date", required_argument, NULL, 'd'},
57 {"file", required_argument, NULL, 'f'},
58 {"reference", required_argument, NULL, 'r'},
59 {"rfc-822", no_argument, NULL, 'R'},
60 {"set", required_argument, NULL, 's'},
61 {"uct", no_argument, NULL, 'u'},
62 {"utc", no_argument, NULL, 'u'},
63 {"universal", no_argument, NULL, 'u'},
67 #define TZ_UTC0 "TZ=UTC0"
70 # define TZSET tzset ()
72 # define TZSET /* empty */
75 #define MAYBE_SET_TZ_UTC0 \
76 do { if (universal_time) set_tz (TZ_UTC0); } while (0)
82 fprintf (stderr, _("Try `%s --help' for more information.\n"),
87 Usage: %s [OPTION]... [+FORMAT]\n\
88 or: %s [OPTION] [MMDDhhmm[[CC]YY][.ss]]\n\
90 program_name, program_name);
92 Display the current time in the given FORMAT, or set the system date.\n\
94 -d, --date=STRING display time described by STRING, not `now'\n\
95 -f, --file=DATEFILE like --date once for each line of DATEFILE\n\
96 -r, --reference=FILE display the last modification time of FILE\n\
97 -R, --rfc-822 output RFC-822 compliant date string\n\
98 -s, --set=STRING set time described by STRING\n\
99 -u, --utc, --universal print or set Coordinated Universal Time\n\
100 --help display this help and exit\n\
101 --version output version information and exit\n\
105 FORMAT controls the output. The only valid option for the second form\n\
106 specifies Coordinated Universal Time. Interpreted sequences are:\n\
109 %%a locale's abbreviated weekday name (Sun..Sat)\n\
110 %%A locale's full weekday name, variable length (Sunday..Saturday)\n\
111 %%b locale's abbreviated month name (Jan..Dec)\n\
112 %%B locale's full month name, variable length (January..December)\n\
113 %%c locale's date and time (Sat Nov 04 12:02:33 EST 1989)\n\
114 %%d day of month (01..31)\n\
115 %%D date (mm/dd/yy)\n\
116 %%e day of month, blank padded ( 1..31)\n\
120 %%j day of year (001..366)\n\
123 %%m month (01..12)\n\
124 %%M minute (00..59)\n\
126 %%p locale's AM or PM\n\
127 %%r time, 12-hour (hh:mm:ss [AP]M)\n\
128 %%s seconds since 00:00:00, Jan 1, 1970 (a GNU extension)\n\
129 %%S second (00..61)\n\
130 %%t a horizontal tab\n\
131 %%T time, 24-hour (hh:mm:ss)\n\
132 %%U week number of year with Sunday as first day of week (00..53)\n\
133 %%V week number of year with Monday as first day of week (01..52)\n\
134 %%w day of week (0..6); 0 represents Sunday\n\
135 %%W week number of year with Monday as first day of week (00..53)\n\
136 %%x locale's date representation (mm/dd/yy)\n\
137 %%X locale's time representation (%%H:%%M:%%S)\n\
138 %%y last two digits of year (00..99)\n\
139 %%Y year (1970...)\n\
140 %%z RFC-822 style numeric timezone (-0500) (a nonstandard extension)\n\
141 %%Z time zone (e.g., EDT), or nothing if no time zone is determinable\n\
143 By default, date pads numeric fields with zeroes. GNU date recognizes\n\
144 the following modifiers between `%%' and a numeric directive.\n\
146 `-' (hyphen) do not pad the field\n\
147 `_' (underscore) pad the field with spaces\n\
149 puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
154 /* Set the TZ environment variable. */
157 set_tz (const char *tz_eq_zone)
159 if (putenv (tz_eq_zone) != 0)
160 error (1, 0, "memory exhausted");
164 /* Parse each line in INPUT_FILENAME as with --date and display each
165 resulting time and date. If the file cannot be opened, tell why
166 then exit. Issue a diagnostic for any lines that cannot be parsed.
167 If any line cannot be parsed, return nonzero; otherwise return zero. */
170 batch_convert (const char *input_filename, const char *format)
181 /* Suppress `may be used before initialized' warning. */
185 if (strcmp (input_filename, "-") == 0)
187 input_filename = _("standard input");
192 in_stream = fopen (input_filename, "r");
193 if (in_stream == NULL)
195 error (1, errno, "`%s'", input_filename);
204 initial_TZ = getenv ("TZ");
205 if (initial_TZ == NULL)
207 initial_TZ = xstrdup ("TZ=");
211 size_t tz_len = strlen (initial_TZ);
212 char *buf = xmalloc (3 + tz_len + 1);
213 memcpy (mempcpy (buf, "TZ=", 3), initial_TZ, tz_len + 1);
221 line_length = getline (&line, &buflen, in_stream);
224 /* FIXME: detect/handle error here. */
230 /* When given a universal time option, restore the initial
231 value of TZ before parsing each string. */
235 when = get_date (line, NULL);
239 if (line[line_length - 1] == '\n')
240 line[line_length - 1] = '\0';
241 error (0, 0, _("invalid date `%s'"), line);
247 show_date (format, when);
253 if (fclose (in_stream) == EOF)
254 error (2, errno, "`%s'", input_filename);
263 main (int argc, char **argv)
266 const char *datestr = NULL;
267 const char *set_datestr = NULL;
271 char *batch_file = NULL;
272 char *reference = NULL;
273 struct stat refstats;
276 int option_specified_date;
278 program_name = argv[0];
279 setlocale (LC_ALL, "");
280 bindtextdomain (PACKAGE, LOCALEDIR);
281 textdomain (PACKAGE);
283 parse_long_options (argc, argv, "date", GNU_PACKAGE, VERSION,
284 "David MacKenzie", usage);
286 while ((optc = getopt_long (argc, argv, "d:f:r:Rs:u", long_options, NULL))
305 set_datestr = optarg;
315 n_args = argc - optind;
317 option_specified_date = ((datestr ? 1 : 0)
318 + (batch_file ? 1 : 0)
319 + (reference ? 1 : 0));
321 if (option_specified_date > 1)
324 _("the options to specify dates for printing are mutually exclusive"));
328 if (set_date && option_specified_date)
331 _("the options to print and set the time may not be used together"));
337 error (0, 0, _("too many non-option arguments"));
341 if ((set_date || option_specified_date)
342 && n_args == 1 && argv[optind][0] != '+')
345 the argument `%s' lacks a leading `+';\n\
346 When using an option to specify date(s), any non-option\n\
347 argument must be a format string beginning with `+'."),
353 datestr = set_datestr;
355 if (batch_file != NULL)
357 status = batch_convert (batch_file,
358 (n_args == 1 ? argv[optind] + 1 : NULL));
364 if (!option_specified_date && !set_date)
366 if (n_args == 1 && argv[optind][0] != '+')
368 /* Prepare to set system clock to the specified date/time
369 given in the POSIX-format. */
371 datestr = argv[optind];
372 when = posixtime (datestr,
373 PDS_TRAILING_YEAR | PDS_CENTURY | PDS_SECONDS);
378 /* Prepare to print the current date/time. */
379 datestr = _("undefined");
381 format = (n_args == 1 ? argv[optind] + 1 : NULL);
386 /* (option_specified_date || set_date) */
387 if (reference != NULL)
389 if (stat (reference, &refstats))
390 error (1, errno, "%s", reference);
391 when = refstats.st_mtime;
395 when = get_date (datestr, NULL);
398 format = (n_args == 1 ? argv[optind] + 1 : NULL);
402 error (1, 0, _("invalid date `%s'"), datestr);
406 /* Set the system clock to the specified date, then regardless of
407 the success of that operation, format and print that date. */
408 if (stime (&when) == -1)
410 error (0, errno, _("cannot set date"));
415 /* When given a universal time option, set TZ to UTC0 after
416 parsing the specified date, but before printing it. */
419 show_date (format, when);
422 close_stdout_status (2);
427 /* Display the date and/or time in WHEN according to the format specified
428 in FORMAT, followed by a newline. If FORMAT is NULL, use the
429 standard output format (ctime style but with a timezone inserted). */
432 show_date (const char *format, time_t when)
436 size_t out_length = 0;
438 tm = localtime (&when);
442 /* Print the date in the default format. Vanilla ANSI C strftime
443 doesn't support %e, but POSIX requires it. If you don't use
444 a GNU strftime, make sure yours supports %e.
445 If you are not using GNU strftime, you want to change %z
446 in the RFC format to %Z; this gives, however, an invalid
447 RFC time format outside the continental United States and GMT. */
451 ? "%a, %_d %b %Y %H:%M:%S GMT"
452 : "%a, %_d %b %Y %H:%M:%S %z")
453 : "%a %b %e %H:%M:%S %Z %Y");
455 else if (*format == '\0')
464 out = (char *) xrealloc (out, out_length);
466 /* Mark the first byte of the buffer so we can detect the case
467 of strftime producing an empty string. Otherwise, this loop
468 would not terminate when date was invoked like this
469 `LANG=de date +%p' on a system with good language support. */
472 while (strftime (out, out_length, format, tm) == 0 && out[0] != '\0');
474 printf ("%s\n", out);