You can use the app to adjust the time zone in the app settings
More > Settings > Date and time - if it’s set to automatic, untick automatic date and time, then manually set time and date.
You can also can send the following SMS command to the GPS tracker: pw,123456,lz,0,3#
Remark: 0 is for English, 3 is for timezone, choose which one is your timezone. If time zone is -4, then you can send pw,123456,lz,0,-4#
Language code: English: 0, Chinese: 1, French: 10, Russian: 9, Portugal: 3, Spain: 4, German: 5, Turkish: 7, Vietnamese: 8