dconv(1) Convert DATE/TIMEs between calendrical systems.

SYNOPSIS

dconv [OPTION]... [DATE/TIME]...

DESCRIPTION

Convert DATE/TIMEs between calendrical systems. If DATE/TIME is omitted date/times are 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)

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.
--default=DT
For underspecified input use DT as a fallback to fill in missing fields. Must be a date/time in ISO8601 format. If omitted the default value is 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.
--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.

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, @[email protected]{ldn} and @[email protected]{jdn} can also be used as input format string.

EXAMPLES

  $ dconv 2012-03-01
  2012-03-01
  $

  $ dconv -i "%d/%b/%y" 01/Mar/12
  2012-03-01
  $

  $ dconv -f "%d/%b/%y" 2012-03-01
  01/Mar/12
  $

  $ dconv -f "%d/%b/%y" -i "%OY %Om %Od" "MCMXCVIII IX XVII"
  17/Sep/98
  $

  $ dconv 12:03:01
  12:03:01
  $

  $ dconv -i "%I:%M:%S %p" "11:22:33 PM"
  23:22:33
  $

  $ dconv '2012-03-01 00:00:00'
  2012-03-01T00:00:00
  $

  $ dconv 2012-03-01T12:34:56
  2012-03-01T12:34:56
  $

  $ dconv --zone America/Chicago <<EOF
  2012-03-01T07:05:06
  2012-03-01T08:12:34
  2012-03-11T01:05:06
  2012-03-11T02:05:06
  2012-03-11T07:05:06
  2012-03-11T08:05:06
  2012-03-11T17:05:06
  EOF
  2012-03-01T01:05:06
  2012-03-01T02:12:34
  2012-03-10T19:05:06
  2012-03-10T20:05:06
  2012-03-11T01:05:06
  2012-03-11T03:05:06
  2012-03-11T12:05:06
  $

  $ dconv --from-zone America/Chicago <<EOF
  2012-03-01T01:05:06
  2012-03-01T02:12:34
  2012-03-10T19:05:06
  2012-03-10T20:05:06
  2012-03-11T01:05:06
  2012-03-11T03:05:06
  2012-03-11T12:05:06
  EOF
  2012-03-01T07:05:06
  2012-03-01T08:12:34
  2012-03-11T01:05:06
  2012-03-11T02:05:06
  2012-03-11T07:05:06
  2012-03-11T08:05:06
  2012-03-11T17:05:06
  $

  $ dconv --from-zone America/Chicago -z Europe/Berlin '2012-03-01 12:00' -i '%F %H:%M' -f '%F %T'
  2012-03-01 19:00:00
  $

AUTHOR

Written by Sebastian Freundt <[email protected]>

REPORTING BUGS

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