You must enter a proper date format.
{{userinfoForm.controls?.birthDate?.errors?.date.message}}
If you want to apply conditional validation on 'Enrollment Date' then you need to add 'birthDate' input as '16/04/1997'.
Conditional Expression with type 'string'
{{userinfoForm.controls?.enrollmentDate?.errors?.date.message}}
enter date format only
Shows custom message.
{{userinfoForm.controls?.allocationDate?.errors?.date.message}}