[4.x]: Wrong timezone displayed for Date field in CP

[stolat]

What happened?

Description

Timezone for EST dates is being displayed as EDT

Steps to reproduce

1. Create an entry with a Date field with enable Show Time Zone on
2. Set date to 12/1/24, select New York for time zone

Expected behavior

Timezone should be EST

Actual behavior

Timezone is EDT - there is no issue in front-end templates, but content managers are confused and complaining

Craft CMS version

4.12.4.1

PHP version

8.1.2.7

Operating system and version

Ubuntu 22.04.4

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[brandonkelly]

New York is currently on the EDT time zone (D = Daylight).

[stolat]

Understood, but select a date that should be EST and it still shows at D

[brandonkelly]

Right, ok. Just fixed this for the next Craft 4 and 5 releases. Note that the time zone labels won’t refresh automatically – so they may be mislabeled right when you select a date that is on a different time zone. But the labels will correct themselves the next time the form is loaded.

[brandonkelly]

Craft 4.12.6 and 5.4.7 are out with that fix. Thanks for reporting!