dateseq(1)

1DATESEQ(1)                       User Commands                      DATESEQ(1)
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NAME

6       dateseq - Generate a sequence of date/times from FIRST to LAST, option‐
7       ally in steps of
8

SYNOPSIS

10       dateseq [OPTION]...  FIRST [[INCREMENT] LAST]
11

DESCRIPTION

13       Generate a sequence of date/times from FIRST  to  LAST,  optionally  in
14       steps of INCREMENT (which defaults to `1d').
15
16       If  LAST  is  omitted  it defaults to `now' if FIRST is a date/time, or
17       `today' if FIRST is a date, or `time' if FIRST is a time.
18
19       The values of FIRST and LAST are always inclusive and no date/times be‐
20       fore FIRST and no date/times after LAST will be printed.
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22       Negative INCREMENTs must be given, i.e. if FIRST is newer than LAST.
23
24
25       Recognized OPTIONs:
26
27       -h, --help
28              Print help and exit
29
30       -V, --version
31              Print version and exit
32
33       -q, --quiet
34              Suppress  message about date/time and duration parser errors and
35              fix-ups.  The default is to print a  warning  or  the  fixed  up
36              value and return error code 2.
37
38       -f, --format=STRING
39              Output  format.   This can either be a specifier string (similar
40              to strftime()'s FMT) or the name of a calendar.
41
42       -i, --input-format=STRING...
43              Input format, can be used multiple times.  Each  date/time  will
44              be  passed  to  the  input  format parsers in the order they are
45              given, if a date/time can be read successfully with a given  in‐
46              put format specifier string, that value will be used.
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48       -b, --base=DT
49              For underspecified input use DT as a fallback to fill in missing
50              fields.  Also used for ambiguous format specifiers  to  position
51              their  range  on the absolute time line.  Must be a date/time in
52              ISO8601 format.  If omitted defaults to the current date/time.
53
54       -e, --backslash-escapes
55              Enable interpretation of backslash escapes in the output and in‐
56              put format specifier strings.
57
58       --locale=LOCALE
59              Format results according to LOCALE, this would only affect month
60              and weekday names.
61
62       --from-locale=LOCALE
63              Interpret dates on stdin or the command line as coming from  the
64              locale LOCALE, this would only affect month and weekday names as
65              input formats have to be specified explicitly.
66
67       -s, --skip=STRING...
68              Skip weekdays specified by STRING.  STRING can be a single week‐
69              day (Mon, Tue, etc.), and to skip several days the --skip option
70              can be used multiple times.  STRING can also  be  a  comma-sepa‐
71              rated  list of weekday names, or `ss' to skip weekends (sat+sun)
72              altogether.  STRING can also contain date  ranges  like  `mo-we'
73              for monday to wednesday.
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75       --alt-inc=STRING
76              Alternative  increment to use when a date is hit that is skipped
77              as per --skip.  This increment will  be  applied  until  a  non-
78              skipped date is reached.  The special case `0' (default) deacti‐
79              vates alternative incrementing.  A useful value  could  be  `1d'
80              for  increasing sequences and `-1d' for decreasing sequences, so
81              if a skipped date is encountered the next non-skipped  date  af‐
82              ter/before will be used.
83
84       --compute-from-last
85              Compute  a  start  value from LAST using INCREMENT.  This option
86              has an effect only when INCREMENT is not a divisor of the  dura‐
87              tion between FIRST and LAST.  In such case, an alternative FIRST
88              will be computed by  consecutively  subtracting  INCREMENT  from
89              LAST until FIRST is hit or crossed.
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FORMAT SPECS

92       Format specs in dateutils are similar to posix' strftime().
93
94       However,  due  to a broader range of supported calendars dateutils must
95       employ different rules.
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97       Date specs:
98         %a  The abbreviated weekday name
99         %A  The full weekday name
100         %_a The weekday name shortened to a single character (MTWRFAS)
101         %b  The abbreviated month name
102         %B  The full month name
103         %_b The month name shortened to a single character (FGHJKMNQUVXZ)
104         %c  The count of the weekday within the month (range 00 to 05)
105         %C  The count of the weekday within the year (range 00 to 53)
106         %d  The day of the month, 2 digits (range 00 to 31)
107         %D  The day of the year, 3 digits (range 000 to 366)
108         %F  Equivalent to %Y-%m-%d (ymd's canonical format)
109         %g  ISO week date year without the century (range 00 to 99)
110         %G  ISO week date year including the century
111         %j  Equivalent to %D
112         %m  The month in the current calendar (range 00 to 12)
113         %Q  The quarter of the year (range Q1 to Q4)
114         %q  The number of the quarter (range 01 to 04)
115         %s  The number of seconds since the Epoch.
116         %u  The weekday as number (range 01 to 07, Sunday being 07)
117         %U  The week count,  day of week is Sun (range 00 to 53)
118         %V  The ISO week count,  day of week is Mon (range 01 to 53)
119         %w  The weekday as number (range 00 to 06, Sunday being 00)
120         %W  The week count,  day of week is Mon (range 00 to 53)
121         %y  The year without a century (range 00 to 99)
122         %Y  The year including the century
123         %_y The year shortened to a single digit
124         %Z  The zone offset in hours and minutes (HH:MM) with
125             a preceding sign (+ for offsets east of UTC, - for offsets
126             west of UTC)
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128         %Od The day as roman numerals
129         %Om The month as roman numerals
130         %Oy The two digit year as roman numerals
131         %OY The year including the century as roman numerals
132
133         %rs In time systems whose Epoch is different from the unix Epoch, this
134             selects the number of seconds since then.
135         %rY In calendars with years that don't coincide with the Gregorian
136             years, this selects the calendar's year.
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138         %dth  The day of the month as an ordinal number, 1st, 2nd, 3rd, etc.
139         %mth  The month of the year as an ordinal number, 1st, 2nd, 3rd, etc.
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141         %db The business day of the month (since last month's ultimo)
142         %dB Number of business days until this month's ultimo
143
144       Time specs:
145         %H  The hour of the day using a 24h clock, 2 digits (range 00 to 23)
146         %I  The hour of the day using a 12h clock, 2 digits (range 01 to 12)
147         %M  The minute (range 00 to 59)
148         %N  The nanoseconds (range 000000000 to 999999999)
149         %p  The string AM or PM, noon is PM and midnight is AM.
150         %P  Like %p but in lowercase
151         %S  The  (range 00 to 60, 60 is for leap seconds)
152         %T  Equivalent to %H:%M:%S
153
154       General specs:
155         %n  A newline character
156         %t  A tab character
157         %%  A literal % character
158
159       Modifiers:
160         %O  Modifier to turn decimal numbers into Roman numerals
161         %r  Modifier to turn units into real units
162         %0  Modifier to turn on zero prefixes
163         %SPC  Modifier to turn on space prefixes
164         %-  Modifier to turn off prefixes altogether
165         th  Suffix, read and print ordinal numbers
166         b   Suffix, treat days as business days
167
168       By design dates before 1601-01-01 are not supported.
169
170       For conformity here is a list of calendar designators and their  corre‐
171       sponding format string:
172         ymd     %Y-%m-%d
173         ymcw    %Y-%m-%c-%w
174         ywd     %rY-W%V-%u
175         bizda   %Y-%m-%db
176         lilian     n/a
177         ldn        n/a
178         julian     n/a
179         jdn        n/a
180         matlab     n/a
181         mdn        n/a
182
183       These  designators  can  be  used  as  output  format string, moreover,
184       @code{lilian}/@code{ldn} and @code{julian}/@code{jdn} can also be  used
185       as input format string.
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187

SPECIFYING DURATIONS

189       Some tools ("dateadd", "dateseq") need durations as their input.  Dura‐
190       tions are generally incompatible with input  formats  as  specified  by
191       "-i|--input-format" and (at the moment) the input syntax is fixed.
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193       The  general  format  is  "+-Nunit" where "+" or "-" is the sign, "N" a
194       number, and "unit" the unit as discussed below.
195
196       Units:
197         s  seconds
198         m  minutes
199         h  hours
200         rs real-life seconds, as in including leap  transitions
201
202         d  days
203         b  business days
204         mo months
205         y  years
206
207       For historical reasons, we used to accept "m" in the context  of  date-
208       only  input  as a qualifier for months.  As of 0.4.4, this is no longer
209       the case.
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211

EXAMPLES

213         $ dateseq 2012-02-01 2012-03-01
214         2012-02-01
215         2012-02-02
216         2012-02-03
217         2012-02-04
218         2012-02-05
219         2012-02-06
220         2012-02-07
221         2012-02-08
222         2012-02-09
223         2012-02-10
224         2012-02-11
225         2012-02-12
226         2012-02-13
227         2012-02-14
228         2012-02-15
229         2012-02-16
230         2012-02-17
231         2012-02-18
232         2012-02-19
233         2012-02-20
234         2012-02-21
235         2012-02-22
236         2012-02-23
237         2012-02-24
238         2012-02-25
239         2012-02-26
240         2012-02-27
241         2012-02-28
242         2012-02-29
243         2012-03-01
244         $
245
246         $ dateseq 2001-02-03 2001-03-03 --skip sat -f "%F %a"
247         2001-02-04 Sun
248         2001-02-05 Mon
249         2001-02-06 Tue
250         2001-02-07 Wed
251         2001-02-08 Thu
252         2001-02-09 Fri
253         2001-02-11 Sun
254         2001-02-12 Mon
255         2001-02-13 Tue
256         2001-02-14 Wed
257         2001-02-15 Thu
258         2001-02-16 Fri
259         2001-02-18 Sun
260         2001-02-19 Mon
261         2001-02-20 Tue
262         2001-02-21 Wed
263         2001-02-22 Thu
264         2001-02-23 Fri
265         2001-02-25 Sun
266         2001-02-26 Mon
267         2001-02-27 Tue
268         2001-02-28 Wed
269         2001-03-01 Thu
270         2001-03-02 Fri
271         $
272
273         $ dateseq --compute-from-last 2001-02-03 1 2001-03-03 --skip sat -f "%F %a"
274         2001-02-04 Sun
275         2001-02-05 Mon
276         2001-02-06 Tue
277         2001-02-07 Wed
278         2001-02-08 Thu
279         2001-02-09 Fri
280         2001-02-11 Sun
281         2001-02-12 Mon
282         2001-02-13 Tue
283         2001-02-14 Wed
284         2001-02-15 Thu
285         2001-02-16 Fri
286         2001-02-18 Sun
287         2001-02-19 Mon
288         2001-02-20 Tue
289         2001-02-21 Wed
290         2001-02-22 Thu
291         2001-02-23 Fri
292         2001-02-25 Sun
293         2001-02-26 Mon
294         2001-02-27 Tue
295         2001-02-28 Wed
296         2001-03-01 Thu
297         2001-03-02 Fri
298         $
299
300         $ dateseq 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
301         2001-02-06 Tue
302         2001-02-12 Mon
303         2001-02-15 Thu
304         2001-02-18 Sun
305         2001-02-21 Wed
306         2001-02-27 Tue
307         $
308
309         $ dateseq --compute-from-last 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
310         2001-02-04 Sun
311         2001-02-07 Wed
312         2001-02-13 Tue
313         2001-02-19 Mon
314         2001-02-22 Thu
315         2001-02-25 Sun
316         2001-02-28 Wed
317         $
318
319         $ dateseq 2001-02-05 4 2001-03-04 -f "%F %a"
320         2001-02-05 Mon
321         2001-02-09 Fri
322         2001-02-13 Tue
323         2001-02-17 Sat
324         2001-02-21 Wed
325         2001-02-25 Sun
326         2001-03-01 Thu
327         $
328
329         $ dateseq --compute-from-last 2001-02-05 4 2001-03-04 -f "%F %a"
330         2001-02-08 Thu
331         2001-02-12 Mon
332         2001-02-16 Fri
333         2001-02-20 Tue
334         2001-02-24 Sat
335         2001-02-28 Wed
336         2001-03-04 Sun
337         $
338
339         $ dateseq --alt-inc 1d 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
340         2001-02-04 Sun
341         2001-02-07 Wed
342         2001-02-11 Sun
343         2001-02-14 Wed
344         2001-02-18 Sun
345         2001-02-21 Wed
346         2001-02-25 Sun
347         2001-02-28 Wed
348         $
349
350         $ dateseq --compute-from-last --alt-inc 1d 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
351         2001-02-04 Sun
352         2001-02-07 Wed
353         2001-02-11 Sun
354         2001-02-14 Wed
355         2001-02-18 Sun
356         2001-02-21 Wed
357         2001-02-25 Sun
358         2001-02-28 Wed
359         $
360
361         $ dateseq 2001-01-01 2d 2001-01-08
362         2001-01-01
363         2001-01-03
364         2001-01-05
365         2001-01-07
366         $
367
368         $ dateseq --compute-from-last 2001-01-01 2d 2001-01-08
369         2001-01-02
370         2001-01-04
371         2001-01-06
372         2001-01-08
373         $
374
375         $ dateseq 2001-01-08 -2d 2001-01-01
376         2001-01-08
377         2001-01-06
378         2001-01-04
379         2001-01-02
380         $
381
382         $ dateseq --compute-from-last 2001-01-08 -2d 2001-01-01
383         2001-01-07
384         2001-01-05
385         2001-01-03
386         2001-01-01
387         $
388
389         $ dateseq 10:00:00 12m 11:20:00
390         10:00:00
391         10:12:00
392         10:24:00
393         10:36:00
394         10:48:00
395         11:00:00
396         11:12:00
397         $
398
399         $ dateseq --compute-from-last 10:00:00 12m 11:20:00
400         10:08:00
401         10:20:00
402         10:32:00
403         10:44:00
404         10:56:00
405         11:08:00
406         11:20:00
407         $
408
409         $ dateseq 11:20:00 -12m 10:00:00
410         11:20:00
411         11:08:00
412         10:56:00
413         10:44:00
414         10:32:00
415         10:20:00
416         10:08:00
417         $
418
419         $ dateseq --compute-from-last 11:20:00 -12m 10:00:00
420         11:12:00
421         11:00:00
422         10:48:00
423         10:36:00
424         10:24:00
425         10:12:00
426         10:00:00
427         $
428

AUTHOR

430       Written by Sebastian Freundt <freundt@fresse.org>
431

REPORTING BUGS

433       Report bugs to: https://github.com/hroptatyr/dateutils/issues
434