--- name: "dateutils.dconv" section: "1" platform: "linux" package: "dateutils" version: "0.4.11-1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/dateconv" --- # dateutils.dconv(1) Convert DATE/TIMEs between calendrical systems. Part of [dateconv(1)](/dateconv/1.md). ## NAME dateconv - Convert DATE/TIMEs between calendrical systems. ## SYNOPSIS **dateconv** \[*OPTION*\]... \[*DATE/TIME*\]... ## 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 *OPTION*s: - **-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. ## 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. ## EXAMPLES ``` $ dateconv 2012-03-01 2012-03-01 $ ``` ``` $ dateconv -i "%d/%b/%y" 01/Mar/12 2012-03-01 $ ``` ``` $ dateconv -f "%d/%b/%y" 2012-03-01 01/Mar/12 $ ``` ``` $ dateconv -f "%d/%b/%y" -i "%OY %Om %Od" "MCMXCVIII IX XVII" 17/Sep/98 $ ``` ``` $ dateconv 12:03:01 12:03:01 $ ``` ``` $ dateconv -i "%I:%M:%S %p" "11:22:33 PM" 23:22:33 $ ``` ``` $ dateconv '2012-03-01 00:00:00' 2012-03-01T00:00:00 $ ``` ``` $ dateconv 2012-03-01T12:34:56 2012-03-01T12:34:56 $ ``` ``` $ dateconv --zone America/Chicago < ## REPORTING BUGS Report bugs to: https://github.com/hroptatyr/dateutils/issues ## SEE ALSO The full documentation for **dateconv** is maintained as a Texinfo manual. If the **info** and **dateconv** programs are properly installed at your site, the command - **info (dateutils)dateconv** should give you access to the complete manual.