Daylight Saving Time should change your phone's battery life. You shouldn't have to do anything unless you've messed with the time and date settings before.
Daylight Saving Time occurs twice a year in the US. We "fall back" an hour later in the year. It's all sort of complicated, depending on where you live. The confusion inevitably leads to people wondering what to do with their phones after the switch.
Daylight Saving Time started at 2 a.m. The end of the show will be at 2 a.m. There is an hour and a half later. The 1 a.m. hour on Sunday will be repeated by the clock going back one hour. We will all get an hour of sleep. That's right!
You shouldn't have to do anything. Unless you went into your phone's settings, you won't have to do anything. Your phone will automatically check the network for the correct date and time and switch on its own, changing the system time so that things like calendar and alarms will still be correct.
When other parts of the world move an hour forward or back on their schedule, or if you travel to those places and will still apply in six months, it's the same thing. It gives our phones the correct local time when we fly or drive to a different time zone.
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If you turn off your phone during the time change, Daylight Saving Time should be applied to it. We want you to follow up with your carrier if you have any issues with your phone settings.
It is easy to see if your settings are correct if you are worried about your phone's ability to switch time automatically.
There are some phones that have a different process. There is a way to check that your settings are correct.
If your phone is set to automatically update to Daylight Saving Time, you will not have to worry about missing your alarm on Monday.