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PROGRAM:

NAME


dseq - Generate a sequence of date/times from FIRST to LAST, optionally in steps of

SYNOPSIS


dseq [OPTION]... FIRST [[INCREMENT] LAST]

DESCRIPTION


Generate a sequence of date/times from FIRST to LAST, optionally in steps of INCREMENT
(which defaults to `1d').

If LAST is omitted it defaults to `now' if FIRST is a date/time, or `today' if FIRST is a
date, or `time' if FIRST is a time.

The values of FIRST and LAST are always inclusive and no date/times before FIRST and no
date/times after LAST will be printed.

Negative INCREMENTs must be given, i.e. if FIRST is newer than LAST.

Recognized OPTIONs:

-h, --help
Print help and exit

-V, --version
Print version and exit

-q, --quiet
Suppress message about date/time and duration parser errors and fix-ups. The
default is to print a warning or the fixed up value and return error code 2.

-f, --format=STRING
Output format. This can either be a specifier string (similar to strftime()'s FMT)
or the name of a calendar.

-i, --input-format=STRING...
Input format, can be used multiple times. Each date/time will be passed to the
input format parsers in the order they are given, if a date/time can be read
successfully with a given input format specifier string, that value will be used.

-e, --backslash-escapes
Enable interpretation of backslash escapes in the output and input format specifier
strings.

-s, --skip=STRING...
Skip weekdays specified by STRING. STRING can be a single weekday (Mon, Tue,
etc.), and to skip several days the --skip option can be used multiple times.
STRING can also be a comma-separated list of weekday names, or `ss' to skip
weekends (sat+sun) altogether. STRING can also contain date ranges like `mo-we'
for monday to wednesday.

--alt-inc=STRING
Alternative increment to use when a date is hit that is skipped as per --skip.
This increment will be applied until a non-skipped date is reached. The special
case `0' (default) deactivates alternative incrementing. A useful value could be
`1d' for increasing sequences and `-1d' for decreasing sequences, so if a skipped
date is encountered the next non-skipped date after/before will be used.

--compute-from-last
Compute a start value from LAST using INCREMENT. This option has an effect only
when INCREMENT is not a divisor of the duration between FIRST and LAST. In such
case, an alternative FIRST will be computed by consecutively subtracting INCREMENT
from LAST until FIRST is hit or crossed.

FORMAT SPECS


Format specs in dateutils are similar to posix' strftime().

However, due to a broader range of supported calendars dateutils must employ different
rules.

Date specs:
%a The abbreviated weekday name
%A The full weekday name
%_a The weekday name shortened to a single character (MTWRFAS)
%b The abbreviated month name
%B The full month name
%_b The month name shortened to a single character (FGHJKMNQUVXZ)
%c The count of the weekday within the month (range 00 to 05)
%C The count of the weekday within the year (range 00 to 53)
%d The day of the month, 2 digits (range 00 to 31)
%D The day of the year, 3 digits (range 000 to 366)
%F Equivalent to %Y-%m-%d (ymd's canonical format)
%j Equivalent to %D
%m The month in the current calendar (range 00 to 19)
%Q The quarter of the year (range Q1 to Q4)
%q The number of the quarter (range 01 to 04)
%s The number of seconds since the Epoch.
%u The weekday as number (range 01 to 07, Sunday being 07)
%U The week count, day of week is Sun (range 00 to 53)
%V The ISO week count, day of week is Mon (range 01 to 53)
%w The weekday as number (range 00 to 06, Sunday being 00)
%W The week count, day of week is Mon (range 00 to 53)
%y The year without a century (range 00 to 99)
%Y The year including the century
%Z The zone offset in hours and minutes (HH:MM) with
a preceding sign (+ for offsets east of UTC, - for offsets
west of UTC)

%Od The day as roman numerals
%Om The month as roman numerals
%Oy The two digit year as roman numerals
%OY The year including the century as roman numerals

%rs In time systems whose Epoch is different from the unix Epoch, this
selects the number of seconds since then.
%rY In calendars with years that don't coincide with the Gregorian
years, this selects the calendar's year.

%dth The day of the month as an ordinal number, 1st, 2nd, 3rd, etc.
%mth The month of the year as an ordinal number, 1st, 2nd, 3rd, etc.

%db The business day of the month (since last month's ultimo)
%dB Number of business days until this month's ultimo

Time specs:
%H The hour of the day using a 24h clock, 2 digits (range 00 to 23)
%I The hour of the day using a 12h clock, 2 digits (range 01 to 12)
%M The minute (range 00 to 59)
%N The nanoseconds (range 000000000 to 999999999)
%p The string AM or PM, noon is PM and midnight is AM.
%P Like %p but in lowercase
%S The (range 00 to 60, 60 is for leap seconds)
%T Equivalent to %H:%M:%S

General specs:
%n A newline character
%t A tab character
%% A literal % character

Modifiers:
%O Modifier to turn decimal numbers into Roman numerals
%r Modifier to turn units into real units
th Suffix, read and print ordinal numbers
b Suffix, treat days as business days

By design dates before 1601-01-01 are not supported.

For conformity here is a list of calendar designators and their corresponding format
string:
ymd %Y-%m-%d
ymcw %Y-%m-%c-%w
ywd %rY-W%V-%u
bizda %Y-%m-%db
lilian n/a
ldn n/a
julian n/a
jdn n/a

These designators can be used as output format string, moreover, @code{lilian}/@code{ldn}
and @code{julian}/@code{jdn} can also be used as input format string.

SPECIFYING DURATIONS


Some tools ("dadd", "dseq") need durations as their input. Durations are generally
incompatible with input formats as specified by "-i|--input-format" and (at the moment)
the input syntax is fixed.

The general format is "+-Nunit" where "+" or "-" is the sign, "N" a number, and "unit" the
unit as discussed below.

Units:
s seconds
m minutes
h hours
rs real-life seconds, as in including leap transitions

d days
b business days
mo months
y years

EXAMPLES


$ dseq 2012-02-01 2012-03-01
2012-02-01
2012-02-02
2012-02-03
2012-02-04
2012-02-05
2012-02-06
2012-02-07
2012-02-08
2012-02-09
2012-02-10
2012-02-11
2012-02-12
2012-02-13
2012-02-14
2012-02-15
2012-02-16
2012-02-17
2012-02-18
2012-02-19
2012-02-20
2012-02-21
2012-02-22
2012-02-23
2012-02-24
2012-02-25
2012-02-26
2012-02-27
2012-02-28
2012-02-29
2012-03-01
$

$ dseq 2001-02-03 2001-03-03 --skip sat -f "%F %a"
2001-02-04 Sun
2001-02-05 Mon
2001-02-06 Tue
2001-02-07 Wed
2001-02-08 Thu
2001-02-09 Fri
2001-02-11 Sun
2001-02-12 Mon
2001-02-13 Tue
2001-02-14 Wed
2001-02-15 Thu
2001-02-16 Fri
2001-02-18 Sun
2001-02-19 Mon
2001-02-20 Tue
2001-02-21 Wed
2001-02-22 Thu
2001-02-23 Fri
2001-02-25 Sun
2001-02-26 Mon
2001-02-27 Tue
2001-02-28 Wed
2001-03-01 Thu
2001-03-02 Fri
$

$ dseq --compute-from-last 2001-02-03 1 2001-03-03 --skip sat -f "%F %a"
2001-02-04 Sun
2001-02-05 Mon
2001-02-06 Tue
2001-02-07 Wed
2001-02-08 Thu
2001-02-09 Fri
2001-02-11 Sun
2001-02-12 Mon
2001-02-13 Tue
2001-02-14 Wed
2001-02-15 Thu
2001-02-16 Fri
2001-02-18 Sun
2001-02-19 Mon
2001-02-20 Tue
2001-02-21 Wed
2001-02-22 Thu
2001-02-23 Fri
2001-02-25 Sun
2001-02-26 Mon
2001-02-27 Tue
2001-02-28 Wed
2001-03-01 Thu
2001-03-02 Fri
$

$ dseq 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
2001-02-06 Tue
2001-02-12 Mon
2001-02-15 Thu
2001-02-18 Sun
2001-02-21 Wed
2001-02-27 Tue
$

$ dseq --compute-from-last 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
2001-02-04 Sun
2001-02-07 Wed
2001-02-13 Tue
2001-02-19 Mon
2001-02-22 Thu
2001-02-25 Sun
2001-02-28 Wed
$

$ dseq 2001-02-05 4 2001-03-04 -f "%F %a"
2001-02-05 Mon
2001-02-09 Fri
2001-02-13 Tue
2001-02-17 Sat
2001-02-21 Wed
2001-02-25 Sun
2001-03-01 Thu
$

$ dseq --compute-from-last 2001-02-05 4 2001-03-04 -f "%F %a"
2001-02-08 Thu
2001-02-12 Mon
2001-02-16 Fri
2001-02-20 Tue
2001-02-24 Sat
2001-02-28 Wed
2001-03-04 Sun
$

$ dseq --alt-inc 1d 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
2001-02-04 Sun
2001-02-07 Wed
2001-02-11 Sun
2001-02-14 Wed
2001-02-18 Sun
2001-02-21 Wed
2001-02-25 Sun
2001-02-28 Wed
$

$ dseq --compute-from-last --alt-inc 1d 2001-02-03 3 2001-03-03 --skip sat,fri -f "%F %a"
2001-02-04 Sun
2001-02-07 Wed
2001-02-11 Sun
2001-02-14 Wed
2001-02-18 Sun
2001-02-21 Wed
2001-02-25 Sun
2001-02-28 Wed
$

$ dseq 2001-01-01 2d 2001-01-08
2001-01-01
2001-01-03
2001-01-05
2001-01-07
$

$ dseq --compute-from-last 2001-01-01 2d 2001-01-08
2001-01-02
2001-01-04
2001-01-06
2001-01-08
$

$ dseq 2001-01-08 -2d 2001-01-01
2001-01-08
2001-01-06
2001-01-04
2001-01-02
$

$ dseq --compute-from-last 2001-01-08 -2d 2001-01-01
2001-01-07
2001-01-05
2001-01-03
2001-01-01
$

$ dseq 10:00:00 12m 11:20:00
10:00:00
10:12:00
10:24:00
10:36:00
10:48:00
11:00:00
11:12:00
$

$ dseq --compute-from-last 10:00:00 12m 11:20:00
10:08:00
10:20:00
10:32:00
10:44:00
10:56:00
11:08:00
11:20:00
$

$ dseq 11:20:00 -12m 10:00:00
11:20:00
11:08:00
10:56:00
10:44:00
10:32:00
10:20:00
10:08:00
$

$ dseq --compute-from-last 11:20:00 -12m 10:00:00
11:12:00
11:00:00
10:48:00
10:36:00
10:24:00
10:12:00
10:00:00
$

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