See DaylightSavingTimeDev? for discussion of this topic.
9.3. Daylight Saving Time
NTP operates on UTC, not local time. The host operating system is responsible for displaying the time in the correct time zone.
If
ntpd has problems after a Daylight Saving Time change:
- Check for another application in your system that is changing the clock
- Verify that your operating system is configured for the correct time zone

If you find a problem with your Operating System that affects
ntpd operation, please file a bug report using your operating system bug tracking system.