To change the default timezone, the first step is to select the timezone of your region among available timezones. For that, you can use tzselect command which allows you to view and choose installed timezone files.
Go through the timezone selection menu to identify your zone.
tzselect will display your timezone in Posix TZ format (e.g., "America/New_York"). Make a note of this value, and proceed next.
Change Timezone on Per-User Basis
If you want to change timezone for a specific user only, you can define TZ environment variable in ~/.bashrc as follows.
Then re-login or execute ~/.bashrc to activate the change.
Change Timezone System-wide
To change timezone on Linux system-wide, use the following commands.
$ sudo ln -s /usr/share/zoneinfo/America/New_York /etc/localtime
Note that the path to the timezone file is constructed from the TZ variable you obtained earlier.
The system-wide timezone can be overridden by TZ environment variable.
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