Hidden date time picker field returning error if user preferred language is 'portugese(portugal)'

Summary

The date time picker field, if set as a hidden field (with default date and time), returns error if the user's is 'portugese(portugal)'.

Steps to Replicate

1. Create a test date time picker custom field.
2. Add the field to the project screen.
3. Create a request type and then add this date field to the screen.
4. Hide this field and set a default value to it.
5. Change your preferred language at your user profile to 'portugese(portugal)'.
6. Create a request with the request type at step 3.

Expected Results

Request gets created without errors.

Current Results

Request creation hits into error.

This form contains a hidden field that does not have a valid default value configured.

Workaround

Change the preferred language in the user profile to English.