Issue Summary

In Jira Cloud team-managed projects, the date/time format for custom fields of type "Date Time Picker" in notification emails is determined by the global setting "jira.date.time.picker.java.format" instead of following the user's language/account preference.

Steps to Reproduce

1. Set up a team-managed project in Jira Cloud.
2. Add a custom field of type "Date Time Picker" to an issue type.
3. Set your Atlassian account language to a non-default locale (e.g., Japanese).
4. Trigger a notification email that includes the custom field value.
5. Observe the date/time format in the received email.

Expected Results

The date/time format in the notification email should match the user's language/account preference.

Actual Results

The date/time format in the notification email follows the global "jira.date.time.picker.java.format" setting, not the user's language/account preference.

Workaround

Change the date/time format globally by navigating to [Gear icon] > [System] > [Advanced Settings] and modifying the value of "jira.date.time.picker.java.format".
Note: This change will affect all users and all notification emails system-wide.