zdump

An alternative version of the zdump utility.

Without arguments, shows current time and data about the Europe/Paris zone:

zdump
Europe/Paris Thu, 19 Dec 2019 13:48:47 +0100 CET, week number: 51

Same thing when specifying a zonename:

zdump America/Phoenix
America/Phoenix Thu, 19 Dec 2019 05:52:04 -0700 MST, week number: 51

When specifying a zonename and a year, outputs timechanges for that year:

zdump Europe/Paris -y 2020
Europe/Paris Sun 29 Mar 01:00:00 2020 UT -> CEST gmtoff=7200 DST: true
Europe/Paris Sun 25 Oct 01:00:00 2020 UT -> CET gmtoff=3600 DST: false

To display all zone's timechanges:

zdump America/Phoenix -a
America/Phoenix Sun 18 Nov 19:00:00 1883 UT -> MST gmtoff=-25200 DST: false
America/Phoenix Sun 31 Mar 09:00:00 1918 UT -> MDT gmtoff=-21600 DST: true
America/Phoenix Sun 27 Oct 08:00:00 1918 UT -> MST gmtoff=-25200 DST: false
America/Phoenix Sun 30 Mar 09:00:00 1919 UT -> MDT gmtoff=-21600 DST: true
America/Phoenix Sun 26 Oct 08:00:00 1919 UT -> MST gmtoff=-25200 DST: false
America/Phoenix Mon  9 Feb 09:00:00 1942 UT -> MWT gmtoff=-21600 DST: true
America/Phoenix Sat  1 Jan 06:01:00 1944 UT -> MST gmtoff=-25200 DST: false
America/Phoenix Sat  1 Apr 07:01:00 1944 UT -> MWT gmtoff=-21600 DST: true
America/Phoenix Sun  1 Oct 06:01:00 1944 UT -> MST gmtoff=-25200 DST: false
America/Phoenix Sun 30 Apr 09:00:00 1967 UT -> MDT gmtoff=-21600 DST: true
America/Phoenix Sun 29 Oct 08:00:00 1967 UT -> MST gmtoff=-25200 DST: false

It uses system TZfiles (default location on Linux and Macos /usr/share/zoneinfo). On Windows, default expected location is HOME/.zoneinfo. You can override the TZfiles default location with the TZFILES_DIR environment variable. Example for Windows:

$env:TZFILES_DIR="C:\Users\nbauw\Dev\rs-tzfile\zoneinfo"; zdump

License: GPL-3.0