use regular WTForms DateField for requests dates

atst/forms/validators.py

@@ -2,13 +2,11 @@ import re
 from wtforms.validators import ValidationError
 import pendulum
 
-from atst.domain.date import parse_date
-
 
 def DateRange(lower_bound=None, upper_bound=None, message=None):
     def _date_range(form, field):
         now = pendulum.now().date()
-        date = parse_date(field.data)
+        date = field.data
 
         if lower_bound is not None:
             if (now - lower_bound) > date: