Description of problem:

In the Quay new UI, after filling in the mirror configuration and clicking the "Enable Organization Mirroring" button, the value of "Start Date" changes and does not match the value set in the form. Debugging revealed that the value of `sync_start_date` in the mirror POST API is incorrect.

Version-Release number of selected component (if applicable):

quay 3.17.0

Steps to reproduce:

1. Create a organization and set it as mirror state

2. In mirror configuration form. fill in desired values. For "Start Date" filed, set "2026/03/02 20:33"

3. Click "Enable Organization Mirroring" button and check the value of  "Start Date" filed again. 

Get the detailed operations in Screen Recording 2026-03-02 at 20.32.16.mov

Actual results:

The value of "Start Date" filed changes to "2026/03/02 12:33" and does not match the original value"2026/03/02 20:33".

Expected results

The value of "Start Date" filed should match the value set in the form.

Additional info:

Check the API send out by UI.