I can see that Your question was answered by my colleague Vivek here: https://community.teltonika-gps.com/23264/time-zone-change?show=23264#q23264
Good day. Thank you for your question.
FMB120 works in synchronized GPS time which is UTC+0, with this option you can configure the time zone and get SMS messages with the correct time. Please refer here to how you can change the time zone - https://wiki.teltonika-gps.com/view/FMB120_SMS/Call_settings (SMS/Call
Settings > SMS Commands > SMS Event Time Zone > change the time zone according to your desired time)
If there are any further questions, feel free to add another comment here.