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tzlocal

API CHANGE!

With version 3.0 of tzlocal, tzlocal no longer returned pytz objects, but zoneinfo objects, which has a different API. Since 4.0, it now restored partial compatibility for pytz users through Paul Ganssle's pytz_deprecation_shim.

tzlocal 4.0 also adds an official function get_localzone_name() to get only the timezone name, instead of a timezone object. On unix, it can raise an error if you don't have a timezone name configured, where get_localzone() will succeed, so only use that if you need the timezone name.

4.0 also adds way more information on what is going wrong in your configuration when the configuration files are unclear or contradictory.

Info

This Python module returns a tzinfo object (with a pytz_deprecation_shim, for pytz compatibility) with the local timezone information, under Unix and Windows.

It requires Python 3.6 or later, and will use the backports.tzinfo package, for Python 3.6 to 3.8.

This module attempts to fix a glaring hole in the pytz and zoneinfo modules, that there is no way to get the local timezone information, unless you know the zoneinfo name, and under several Linux distros that's hard or impossible to figure out.

With tzlocal you only need to call get_localzone() and you will get a tzinfo object with the local time zone info. On some Unices you will still not get to know what the timezone name is, but you don't need that when you have the tzinfo file. However, if the timezone name is readily available it will be used.

Supported systems

These are the systems that are in theory supported:

  • Windows 2000 and later
  • Any unix-like system with a /etc/localtime or /usr/local/etc/localtime

If you have one of the above systems and it does not work, it's a bug. Please report it.

Please note that if you are getting a time zone called local, this is not a bug, it's actually the main feature of tzlocal, that even if your system does NOT have a configuration file with the zoneinfo name of your time zone, it will still work.

You can also use tzlocal to get the name of your local timezone, but only if your system is configured to make that possible. tzlocal looks for the timezone name in /etc/timezone, /var/db/zoneinfo, /etc/sysconfig/clock and /etc/conf.d/clock. If your /etc/localtime is a symlink it can also extract the name from that symlink.

If you need the name of your local time zone, then please make sure your system is properly configured to allow that.

If your unix system doesn't have a timezone configured, tzlocal will default to UTC.

Notes on Docker

It turns out that Docker images frequently have broken timezone setups. This usually resuts in a warning that the configuration is wrong, or that the timezone offset doesn't match the found timezone.

The easiest way to fix that is to set a TZ variable in your docker setup to whatever timezone you want, which is usually the timezone your host computer has.

Usage

Load the local timezone:

>>> from tzlocal import get_localzone
>>> tz = get_localzone()
>>> tz
<DstTzInfo 'Europe/Warsaw' WMT+1:24:00 STD>

Create a local datetime:

>>> from datetime import datetime
>>> dt = datetime(2015, 4, 10, 7, 22, tzinfo=tz)
>>> dt
datetime.datetime(2015, 4, 10, 7, 22, tzinfo=<DstTzInfo 'Europe/Warsaw' CEST+2:00:00 DST>)

Lookup another timezone with zoneinfo (backports.zoneinfo on Python 3.8 or earlier):

>>> from zoneinfo import ZoneInfo
>>> eastern = ZoneInfo('US/Eastern')

Convert the datetime:

>>> dt.astimezone(eastern)
datetime.datetime(2015, 4, 10, 1, 22, tzinfo=<DstTzInfo 'US/Eastern' EDT-1 day, 20:00:00 DST>)

If you just want the name of the local timezone, use get_localzone_name():

>>> from tzlocal import get_localzone_name
>>> get_localzone_name()
"Europe/Warsaw"

Please note that under Unix, get_localzone_name() may fail if there is no zone configured, where get_localzone() would generally succeed.

Development

To create a development environment, create a virtualenv and make a development installation:

$ virtualenv ve
$ source ve/bin/activation (Win32: .\ve\Scripts\activate)
(ve) $ pip install -e .[test,devenv]

To run tests, just use pytest, coverage is nice as well:

(ve) $ pytest --cov=tzlocal

Maintainer

Contributors

  • Marc Van Olmen
  • Benjamen Meyer
  • Manuel Ebert
  • Xiaokun Zhu
  • Cameris
  • Edward Betts
  • McK KIM
  • Cris Ewing
  • Ayala Shachar
  • Lev Maximov
  • Jakub Wilk
  • John Quarles
  • Preston Landers
  • Victor Torres
  • Jean Jordaan
  • Zackary Welch
  • Mickaël Schoentgen
  • Gabriel Corona
  • Alex Grönholm
  • Julin S
  • Miroslav Šedivý
  • revansSZ
  • Sam Treweek

(Sorry if I forgot someone)

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A Python module that tries to figure out what your local timezone is

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