<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def is_daylight_saving_hour(self, datetime):
 """Check if a datetime is a daylight saving time."""

        if not self.daylight_saving_period:
            return False
        return self.daylight_saving_period.isTimeIncluded(datetime.hoy)