start/end time does not be saved

[kai71191-stack]

What version of Adaptive Cover are you using?

1.4.6

What version of Home Assistant are you using?

2026.5.4

Checklist

• I have filled out the issue template to the best of my ability.
• This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
• This issue is not a duplicate issue of currently previous issues..

Describe the issue

I have entered the end time multiple times. It keeps being reset to 00:00:00.

Reproduction steps

...

Diagnostics dump

No response