NAME

dategrep - Grep standard input for lines that match EXPRESSION.

SYNOPSIS

dategrep [OPTION]... EXPRESSION

DESCRIPTION

Grep standard input for lines that match EXPRESSION.

EXPRESSION may be date/times prefixed with an operator `<', `<=', `=', `>=', `>', `!=', `<>' (if omitted defaults to `='), which will match lines with date/times which are older, older-equal, equal, newer-equal, newer, or not equal respectively.

EXPRESSION may also be format specifiers infixed by above operators and suffixed by a value (e.g. `%a="Wed"') which matches lines whose %a representation (weekday name abbreviated) is "Wed".

EXPRESSION may be statements as described above concatenated through `&&' (for conjunction) or `||' (disjunction), both of which may be parenthesised as per usual to change precedence (`&&' goes over `||').

If multiple date/times occur on the same line and any one of them fulfills the criteria then the line is considered a match and will be output.

Note:
Operations can be specified by options (--eq, --gt, ...) as well.
This serves solely as a means of convenience, e.g. the datetest tool has a
similar syntax.

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.
-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.
-o, --only-matching: Show only the part of a line matching DATE.
-v, --invert-match: Select non-matching lines.
--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: Consider date/times on stdin as coming from the zone ZONE, default: UTC.
-z, --zone=ZONE: Consider date/times in EXPRESSION as coming from the zone ZONE, default: UTC.
--eq: Lines match when date/times are equal to EXPRESSION.
--ne: Lines match when date/times are not the same as EXPRESSION.
--gt: Lines match when date/times are newer than EXPRESSION.
--lt: Lines match when date/times are older than EXPRESSION.
--ge: Lines match when date/times are newer than or equal EXPRESSION.
--le: Lines match when date/times are older than or equal EXPRESSION.
--nt: Lines match when date/times are newer than or equal EXPRESSION.
--ot: Lines match when date/times are older than or equal EXPRESSION.

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 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


  %_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


  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.

EXAMPLES



  $ dategrep 2012-03-01 <<EOF


  2012-02-28


  2012-02-29


  2012-03-01


  2012-03-02


  EOF


  2012-03-01


  $



  $ dategrep '<2012-03-01' <<EOF


  2012-02-28


  2012-02-29


  2012-03-01


  2012-03-02


  EOF


  2012-02-28


  2012-02-29


  $



  $ dategrep \!=2012-03-01 <<EOF


  2012-02-28


  2012-02-29


  2012-03-01


  2012-03-02


  EOF


  2012-02-28


  2012-02-29


  2012-03-02


  $



  $ dategrep =2012-03-01 <<EOF


  Feb	2012-02-28


  Feb	2012-02-29	leap day


  Mar	2012-03-01


  Mar	2012-03-02


  EOF


  Mar	2012-03-01


  $



  $ dategrep -o \<2012-03-01 <<EOF


  Feb	2012-02-28


  Feb	2012-02-29	leap day


  Mar	2012-03-01


  Mar	2012-03-02


  EOF


  2012-02-28


  2012-02-29


  $



  $ dategrep '>=12:00:00' <<EOF


  fileA	11:59:58


  fileB	11:59:59	leap ?


  fileNOON	12:00:00	new version


  fileC	12:03:12


  EOF


  fileNOON	12:00:00	new version


  fileC	12:03:12


  $



  $ dategrep -o '>=12:00:00' <<EOF


  fileA	11:59:58


  fileB	11:59:59	leap ?


  fileNOON	12:00:00	new version


  fileC	12:03:12


  EOF


  12:00:00


  12:03:12


  $



  $ dategrep 2012-03-01 <<EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  2012-03-01T10:00:00


  2012-03-02T10:00:00


  EOF


  2012-03-01T10:00:00


  $



  $ dategrep '<2012-03-01' <<EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  2012-03-01T10:00:00


  2012-03-02T10:00:00


  EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  $



  $ dategrep 2012-03-01T10:00:00 <<EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  2012-03-01T10:00:00


  2012-03-02T10:00:00


  EOF


  2012-03-01T10:00:00


  $



  $ dategrep '<2012-03-01T14:00:00' <<EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  2012-03-01T10:00:00


  2012-03-02T10:00:00


  EOF


  2012-02-28T10:00:00


  2012-02-29T10:00:00


  2012-03-01T10:00:00


  $

AUTHOR

Written by Sebastian Freundt <freundt@fresse.org>

REPORTING BUGS

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