[BUG] Replace timezone names with GMT offsets

[mjabascal10]

Currently, the timezone labels include descriptive names (e.g., Eastern Standard Time (New York), Pacific Standard Time (Los Angeles)) instead of displaying the corresponding GMT offsets (e.g., GMT-5, GMT-8). This inconsistency can lead to confusion for users who are more accustomed to seeing GMT offsets rather than timezone names.

A clear and concise description of what the bug is.

To Reproduce

1. Go to the application.
2. Click on the menu in the top right corner.
3. Select the Settings option from the sidebar.
4. Scroll down to the timezone settings.
5. Observe that the timezone names are displayed instead of GMT offsets.

Screenshots If applicable, add screenshots to help explain your problem.

Expected Behavior: The timezone labels should be updated to reflect GMT offsets instead of their names. For example:

Chicago should display GMT-5 instead of Central Standard Time (Chicago). Eastern Standard Time (New York) should display GMT-5. Pacific Standard Time (Los Angeles) should display GMT-8.

Possible solution

Not required, but you can suggest a possible solution or reason for the bug.