Simplisafe Schedule Events and Reminders don't change time with Daylight Savings Time
Just had this issue. Alarm armed an hour early. Contacted Support via Chat. They told me to reboot the system (unplug, pull battery), when they should have said "let's look at the timeline". Reboot did nothing. Timeline showed event happened an hour early.
Go into each event and reminder, and change the time. Save. Then go back in and change the time back. Save.
SimpliSafe ensures that new features know what time it is...