def _date_is_parsable(self, value):
    'Return True if date is parsable and False otherwise.'
    try:
        if (float(value) < 9999):
            raise ValueError('This is not in the form ms since the epoch.')
    except ValueError:
        try:
            parse(value)
        except ValueError:
            return False
    return True
Return True if date is parsable and False otherwise.
def _date_is_parsable(self, value):
    
    try:
        if (float(value) < 9999):
            raise ValueError('This is not in the form ms since the epoch.')
    except ValueError:
        try:
            parse(value)
        except ValueError:
            return False
    return True