Summary:
Error when required date field is less than or egal to 1 January 1970
Detailed Description:
In the admin_edituser2 step, it's not possible to validate the form when a
required date field is less than or egal to 1 January 1970.
Probably because in this case, the value is negative. For example, for January
01, 1970, the value is -3600.
In this case, an alert is displayed "birth_date is a required field" and it's
not possible to validate the user's record.