Some countries and regions are currently using daylight saving time.

When the time switches, the time of cell phones and other smart computing devices will automatically switch, but smart home devices are limited by the ability of the device, it is difficult to do so automatically, and here is why.

Usually, in order to ensure the device timer works properly, when the timer is set through the App, the specific action is that the App will pass the setting to the server, which will notify the device and record a timing task, which is written to the device's local memory, so as to ensure that the timer can still run normally when the device is not connected to the Internet.

Because the timer is so designed, it also makes it less feasible to adjust the timer of the device directly from the server. Because it's difficult to ensure that the device is networked when processing the modification command, and if the command is sent down frequently, it will cause other problems; more importantly, the server does not have the device location data, which also makes it impossible for the server to calculate the precise time after the adjustment that should be made.

And from the device's point of view, when setting a timing task, the reference time standard is UTC time, not daylight saving time. For example, the current is daylight saving time, and the difference between daylight saving time and standard time is 1 hour then, when you set a device timed at 8 o'clock in the morning, in the device's view, it creates a timing task at 7 o'clock in the morning; This causes confusion and even problems that this device executes a timing task at 7 o'clock instead of 8 o'clock in the morning after daylight saving time ends.

The most direct way to solve the timer offset problem caused by the end of DST is to reset it again, but when there are multiple timers, the bulk modify timer feature may help you, this feature named "Edit Timers" allows users to bulk modify the timer settings, push back or advance the timer running time, we know this solution seems not perfect, but hope it can help you, please feel free to contact us via support@ewelink.zendesk.com.