dateadd(1)

1DATEADD(1)                       User Commands                      DATEADD(1)
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NAME

6       dateadd - Add DURATION to DATE/TIME and print the result.
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SYNOPSIS

9       dateadd [OPTION]...  [DATE/TIME] [DURATION]
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DESCRIPTION

12       Add  DURATION to DATE/TIME and print the result.  If DATE/TIME is omit‐
13       ted but DURATION is given, read a list of DATE/TIMEs  from  stdin.   If
14       DURATION  is  omitted  but DATE/TIME is given, read a list of DURATIONs
15       from stdin.
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17       Durations are specified as nY, nMO, nW, or nD for years, months, weeks,
18       or  days  respectively,  or nH, nM, nS for hours, minutes, and seconds,
19       where N is a (possibly negative) number.  The unit symbols can be writ‐
20       ten  lower-case  as well (y, mo, w, d, h, m, s) and the unit symbol `d'
21       can be omitted.
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23       Note that duration addition is not commutative!
24         2000-03-30 +1mo +1d -> 2000-05-01
25         2000-03-30 +1d +1mo -> 2000-04-30
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27
28       Recognized OPTIONs:
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30       -h, --help
31              Print help and exit
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33       -V, --version
34              Print version and exit
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36       -q, --quiet
37              Suppress message about date/time and duration parser errors  and
38              fix-ups.   The  default  is  to  print a warning or the fixed up
39              value and return error code 2.
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41       -f, --format=STRING
42              Output format.  This can either be a specifier  string  (similar
43              to strftime()'s FMT) or the name of a calendar.
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45       -i, --input-format=STRING...
46              Input  format,  can be used multiple times.  Each date/time will
47              be passed to the input format parsers  in  the  order  they  are
48              given,  if a date/time can be read successfully with a given in‐
49              put format specifier string, that value will be used.
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51       -b, --base=DT
52              For underspecified input use DT as a fallback to fill in missing
53              fields.   Also  used for ambiguous format specifiers to position
54              their range on the absolute time line.  Must be a  date/time  in
55              ISO8601 format.  If omitted defaults to the current date/time.
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57       -e, --backslash-escapes
58              Enable interpretation of backslash escapes in the output and in‐
59              put format specifier strings.
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61       -S, --sed-mode
62              Copy parts from the input before and after a matching date/time.
63              Note  that  all  occurrences of date/times within a line will be
64              processed.
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66       -E, --empty-mode
67              Empty lines that cannot be parsed.
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69       --locale=LOCALE
70              Format results according to LOCALE, this would only affect month
71              and weekday names.
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73       --from-locale=LOCALE
74              Interpret  dates on stdin or the command line as coming from the
75              locale LOCALE, this would only affect month and weekday names as
76              input formats have to be specified explicitly.
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78       --from-zone=ZONE
79              Interpret  dates on stdin or the command line as coming from the
80              time zone ZONE.
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82       -z, --zone=ZONE
83              Convert dates printed on stdout to time zone ZONE, default: UTC.
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FORMAT SPECS

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

SPECIFYING DURATIONS

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

207         $ dateadd 2012-03-01 1d
208         2012-03-02
209         $
210
211         $ dateadd 2012-03-01 1mo
212         2012-04-01
213         $
214
215         $ dateadd 2012-03-31 1mo
216         2012-04-30
217         $
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219         $ dateadd 2w2d <<EOF
220         2012-03-01
221         2012-03-02
222         2012-03-04
223         2012-03-08
224         2012-03-16
225         EOF
226         2012-03-17
227         2012-03-18
228         2012-03-20
229         2012-03-24
230         2012-04-01
231         $
232
233         $ dateadd 10:01:00 1h6m
234         11:07:00
235         $
236
237         $ dateadd 10:01:00 -1h6m
238         08:55:00
239         $
240
241         $ dateadd 10:01:00 3605s
242         11:01:05
243         $
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AUTHOR

246       Written by Sebastian Freundt <freundt@fresse.org>
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REPORTING BUGS

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