Steps to reproduce

1. Log in to back office.
2. Go to url {host}/admin/search
3. Expand Last modified dropdown on filters left side menu.
4. Select an option 'Custom range'.
5. Verify page elements.
6. Expand Created dropdown on filters left side menu.
7. Repeat step 4 and 5.

Actual result:

Custom range filter for Last modified and Created fields are not properly formatted.

Expected result:

Properly formatted fields.