Steps to Reproduce

Set the time format to yyyy-MM-dd HH:mm. Open the datebox and set the time field to a value different from the current time. Then, clear the datebox input, enter a date without specifying the time, and blur the field by clicking else where or pressing Tab/Enter.

Current Result

The selected time will be replaced by the default time (current time).

Expected Result

The time should correctly reflect the value modified by the user.

Debug Information

This issue does not occur when both a date and time are entered in the datebox field. Additionally, in certain time formats such as "long+medium", users are unable to input a date without a time, which prevents the bug from occurring in those cases.