Time is displayed on the screen of AM100 Series Sensors. This article will guid you how to sync time on AM100 Series.
Milesight LoRaWAN Sensor: AM104/AM107
Mobile App Configuration
Open Toolbox App and go to Device ->Status to click Sync to sync the time to mobile phone time on the screen.
Log in Toolbox and go to Status page to to click Sync to sync the time to computer time on the screen.