How to fix incorrect timestamps on messages
If the timestamp on messages you’ve received is wrong, please check the time and time zone configuration on your phone and adjust it.
This can also help to fix incorrect last seen times.
Setting date and time
We recommend setting your date and time to Automatic or Network Provided. This means your mobile provider will set your phone to the correct time.
If you still see the wrong time, there might be an issue with your network. Please contact your mobile provider.
How to configure your timezone
You can also modify your date and time settings and correct your time zone manually.
To do so, visit the Google support website for instructions.