Ubuntu Manpage: dateround - Round DATE/TIME to the next occurrence of RNDSPEC.

NAME

       dateround - Round DATE/TIME to the next occurrence of RNDSPEC.

SYNOPSIS

       dateround [OPTION]...  [DATE/TIME] RNDSPEC...

DESCRIPTION

Round DATE/TIME to the next occurrence of RNDSPEC.

If DATE/TIME is omitted a stream of date/times is read from stdin.

DATE/TIME can also be one of the following specials
- `now' interpreted as the current (UTC) time stamp
- `time' the time part of the current (UTC) time stamp
- `today' the current date (according to UTC)
- `tomo[rrow]' tomorrow's date (according to UTC)
- `y[ester]day' yesterday's date (according to UTC)

1. RNDSPECs can be month names (Jan, Feb, ...), weekday names (Sun, Mon, ...),
numerals suffixed with y, q, mo, d, bd, h, m, or s, possibly prefixed with
a dash (`-`) to indicate the rounding direction is downwards.

2. Suffixed RNDSPECs may additionally be prefixed with a slash (`/`) to
indicate that rounding to a multiple of RNDSPEC is desired.
Co-class rounding.

In the first case, rounding affects the named element in the specified date or date/time
and more significant elements by setting this element to the specified value and adjusting
the more significant elements such that the result is greater (younger) or equal to the
input (or strictly greater when -n|--next is given) for positive values, and less (older)
or equal (unless -n|--next is given) for named elements that are prefixed with dash (`-`).
In either case, less significant elements, e.g. subdivisions of the named element and
their subdivisions are left unchanged.

That is dateround 2019-01-28T12:04:00 +6
will yield 2019-02-06T12:04:00

Similarly dateround -n 2019-01-28T12:04:00 -- -Oct
will yield 2018-10-28T12:04:00

In the second case, rounding is more like rounding decimal fractions to negative infinity.
The time axis is partitioned by multiples of the named element, and the oldest date or
datetime is returned that is greater (younger) (or equal if -n|--next is omitted) than the
specified date or date/time, when rounding down (`-` prefix) the oldest date or datetime
is returned that is less (older) than the specified date or datetime.

That is dateround 2019-01-28T12:04:00 /1y
will yield 2020-01-01T00:00:00

Similarly dateround 2019-01-28T12:04:00 /-30m
will yield 2019-01-28T12:00:00

The superdivision of years are millennia, i.e. there's 1000 years, 500 biennia, 100
decades, etc. in a millennium.

Multiple RNDSPECs are evaluated left to right.

Note that rounding isn't commutative, e.g. dateround 2012-03-01 Sat Sep ->
2012-09-03 vs. dateround 2012-03-01 Sep Sat -> 2012-09-01

Note that non-numeric strings prefixed with a `-' conflict with the command line options
and a separating `--' has to be used.

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.

-b, --base=DT
For underspecified input use DT as a fallback to fill in missing fields. Also used
for ambiguous format specifiers to position their range on the absolute time line.
Must be a date/time in ISO8601 format. If omitted defaults to the current
date/time.

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

-S, --sed-mode
Copy parts from the input before and after a matching date/time. Note that all
occurrences of date/times within a line will be processed.

-E, --empty-mode
Empty lines that cannot be parsed.

--locale=LOCALE
Format results according to LOCALE, this would only affect month and weekday names.

--from-locale=LOCALE
Interpret dates on stdin or the command line as coming from the locale LOCALE, this
would only affect month and weekday names as input formats have to be specified
explicitly.

--from-zone=ZONE
Interpret dates on stdin or the command line as coming from the time zone ZONE.

-z, --zone=ZONE
Convert dates printed on stdout to time zone ZONE, default: UTC.

-n, --next
Always round to a different date or time.

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)
         %g  ISO week date year without the century (range 00 to 99)
         %G  ISO week date year including the century
         %j  Equivalent to %D
         %m  The month in the current calendar (range 00 to 12)
         %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
         %_y The year shortened to a single digit
         %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
         %0  Modifier to turn on zero prefixes
         %SPC  Modifier to turn on space prefixes
         %-  Modifier to turn off prefixes altogether
         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
         matlab     n/a
         mdn        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 ("dateadd", "dateseq") 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

       For  historical  reasons,  we  used  to  accept "m" in the context of date-only input as a
       qualifier for months.  As of 0.4.4, this is no longer the case.

EXAMPLES

         $ dateround 2012-03-01 2
         2012-03-02
         $

         $ dateround -n 2012-03-01 1
         2012-04-01
         $

         $ dateround 17:05:00 5m
         17:05:00
         $ dateround 17:04:00 /5m
         17:05:00
         $

         $ dateround -n 17:04:00 4m
         18:04:00
         $ dateround -n 17:04:00 /1m
         17:05:00
         $

AUTHOR

       Written by Sebastian Freundt <freundt@fresse.org>

REPORTING BUGS

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