Ubuntu Manpage: undertime - pick a meeting time

NAME

       undertime - pick a meeting time

SYNOPSIS

       undertime [OPTIONS] [--timezones ZONES] [WHEN]
       undertime -l|--list-zones
       undertime -V|--version
       undertime --selftest

DESCRIPTION

undertime is a program that allows you to quickly pick a meeting time across multiple time
zones for conference calls or other coordinated events. It shows all times of a given day
for all the time zones selected, in a table that aligns the time so a line shows
simultaneous times across all time zones. This takes into account daylight savings and
other peculiarities (provided that the local time zone database is up to date) so you can
also schedule meetings in the future as well.

An educated guess is made to find the relevant time zones: the local time zone is first
guessed and added to the list, then the arguments on the command line are looked up in the
internal time zone database. Spaces in arguments are replaced by underscores and all-caps
versions of lowercase strings are tried as well. When failing to match a provided time
zone against the internal list, a warning is emitted. A complete list of time zones is
shown when the --list-zones command line option is provided.

You can also specify offsets instead of time zones, with the syntax UTC{+|-}offset or
GMT{+|-}offset (for example UTC+2 for CEST or GMT-4 for EDT). Those are discouraged as
daylight savings are not taken into account so the computed time might not represent the
expected local time. Don't confuse those patterns with the "standard" time zones
Etc/GMT{+|-}X: they are the inverse of each other (i.e. EDT, UTC-4 is Etc/GMT+4, yes,
that's confusing). To specify the Etc time zones the full time zone needs to given (for
example Etc/GMT-2). Those should also be avoided: just use normal, location-based zones
instead of those arbitrary offsets.

Colors are used to highlight the "work hours" where possible meeting times could overlap
and the current time is marked in bold. Colors are replaced by an underscore suffix and
the current time by a star if colors are disabled. You can change those work hours with
the --start and --end flags.

Because daylight savings may actually change time, you should also pick an arbitrary time
for the meeting (WHEN), using natural language (as parsed by the parsedatetime library).
The current time is also shown, in bold.

OPTIONS

       -s HOUR, --start HOUR
              start of working day, in hours

       -e HOUR, --end HOUR
              end of working day, in hours

       --no-colors, --colors
              do not show colors. enabled by default if output is a terminal.

       --timezones ZONES
              target date for the meeting, supports arbitrary dates like "in two weeks"

       --no-default-zone, --default-zone
              do not show current time zone first

       --no-unique, --unique
              deduplicate time zones

       --no-overlap, --overlap
              do not show the overlap column (labeled "n"), displayed by default.

       --overlap-min N
              show only times with N overlapping time zones.

       --format FORMAT
              pass FORMAT to the tabulate package to format the main table.

       --config FILE
              load YAML config FILE as defaults.

       -v, --verbose
              enable verbose messages

       --debug
              enable debugging messages

       -l, --list-zones
              show valid time zones and exit

       -V, --version
              show version number and exit

       --selftest
              run test suite

       -h, --help
              show summary of options and defaults

ENVIRONMENT

       TZ     Default time zone.

       NO_COLOR
              If this environment variable is defined, no color will be shown unless the --colors
              flag is passed. Comforming to NO_COLOR informal standard ⟨https://no-color.org/⟩

FILES

       ~/.config/undertime.yml $XDG_CONFIG_DIR/undertime.yml
              The configuration file loaded by default, if present.  The  configuration  file  is
              formatted  as  a  YAML  dictionary,  where  keys are the long option names (without
              dashes) and the values are their values.  Comments  start  with  the  #  character.
              Options  provided as arguments override the defaults set in the configuration file,
              particularly time zones. For example,  this  means  time  zones  specified  in  the
              configuration  file  are  ignored  ignored  when  also  specified as arguments. The
              --config parameter allows you to load another configuration file,  on  top  of  the
              default one, using the same logic, allowing you to have multiple "presets".

EXAMPLE

   Command line options
       undertime --timezones "New York" "Los Angeles" Paris
              Display possible meeting times for three major cities.

       undertime -s 8 -e 18 2014-03-15
              Show a longer work day in march 2014.

       undertime --overlap-min 3 2014-03-15
              Show only times that match in three time zones.

       undertime --timezones "New York" "Los Angeles" Paris -- tomorrow
              Show  times for those three timezones, but for tomorrow. Note the options separator
              (--) is required otherwise the date will be parsed as a timezone.

   Configuration file
       A      sample      configuration       file       should       be       available       in
       /usr/share/doc/undertime/examples/undertime.yml