dm_zdump man page

dm_zdump — timezone dumper


This performs the same operation as the unix 'zdump' command, but using the Date::Manip module.

   dm_zdump [-v] [-c YEAR] [ZONE ZONE ...]


This displays the current time in each ZONE named on the command line unless the -v option is given.

-h, --help

Print online help.

-v, --verbose

This displays all critical dates (i.e. the times when a time change occurs due to the timezone description) for each of the timezones listed (or the local timezone if none are listed).

Each critical date is printed as two lines of output: the last second before the change occurs, and the first second of the new time.

By default, all critical dates from Jan 1, 0001 until the year 20 years in the future are printed, but this can be changed with the -c option.

-c, --cutoff YEAR

This specifies the cutoff year. All critical dates up to the start of YEAR are given. The GMT time Jan 01, YEAR at 00:00:00 is the cutoff time.

Known Bugs

None known.

Bugs and Questions

Please refer to the Date::Manip::Problems documentation for information on submitting bug reports or questions to the author.

See Also



This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself.


Sullivan Beck (


2017-03-01 perl v5.24.1 User Contributed Perl Documentation