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I have a Pixel 4 phone running Android 11. For the past 3 days, I've started having a strange problem where the time on my phone changes to be 1 hour earlier. I'm physically located in Denver, CO, USA, which is solidly in the mountain time zone (eg not by a zone boundary).

Just this morning, the following happened:

  • 7:00 AM - phone time is correct, phone alarm goes off (scheduled).
  • 8:00 AM - phone alarm goes off again -- phone shows 7:00 AM as the time.
  • 8:04 AM - phone corrects itself, time goes back to the correct time.

Yesterday something similar happened:

  • 7:00 AM - phone alarm goes off ... phone thinks that it's 6:00 AM
  • 7:30 AM - phone still thinks it's 6:30 AM
  • 7:32 AM - phone corrects itself, time goes back to the correct time; notifies me about the missed 7AM alarm.

In grid form:

Day Actual Time Phone Time Comment
Today 7:00 AM 7:00 AM Scheduled alarm (7AM)
Today 8:00 AM 7:00 AM Scheduled alarm (7AM)
Today 8:04 AM 8:04 AM Spontaneous correction
Yesterday 7:00 AM 6:00 AM Scheduled alarm (6AM)
Yesterday 7:30 AM 6:30 AM Checked phone, incorrect time still shown
Yesterday 7:32 AM 7:32 AM Spontaneous correction; alerted to missed alarm

I don't know if it happens at other times of day, or only between 6:00-8:00 AM; that just happens to be when I actively look at my phone or (sync'd) smart-watch, or have alarms that go off at those times.

During today's hiccup (at 8:00 AM when it thought it was 7:00 AM), I checked the settings and it shows that it flipped from the correct daylight savings time zone to the incorrect one -- it it was using Mountain Standard Time instead of Mountain Daylight Time. I have it set to use the network-provided time and time-zone.

This is a screenshot of the 'date & time' settings that I took at 8:02 AM Mountain Daylight Time (7:02 AM Mountain Standard Time according to my phone): screenshot of settings|thumb

How do I get this to stop happening? I'd like to avoid turning off the time sync because the other devices I do this on suffer from clock drift and it's a hassle to deal with.

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  • As Android can make use of multiple time sources like the cellular network and an NTP service it is not clear where the problems come from. The time sync documentation of Android may contain some interesting commands you could try to find out more: source.android.com/devices/tech/connect/time-source
    – Robert
    Mar 24, 2022 at 14:39
  • I'm not actually using mobile data. The phone has been on wifi only the whole time (Google Fiber). I'll review the document though, thanks. Mar 24, 2022 at 14:47
  • Possibly related issue since Android 9: Time zone keeps changing wildly
    – Andrew T.
    Mar 24, 2022 at 14:52
  • I looked at that question, but the two bug tracker issues are closed as either obsolete or infeasible, and it was against an older Android version. Mar 24, 2022 at 14:55
  • The time sync in cellular network is as far as I know independent of mobile data. The cell tower send the time as part of the GSM protocol.
    – Robert
    Mar 24, 2022 at 14:55

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