avl_time_state.md

 # D2Sphere and Device Time Managment
 
+## Timeformat
+* current time formats are in use:
+  * International Atomic Time (TAI) 
+  * Coordinated Universal Time (UTC)
+  * GPS time (GPST)
+* Time difference by leap seconds
+  * (TAI − GPS = 19 seconds)
+  * (TAI - UTC = 37 seconds)
+* all devices use 'GPS time' GPST as base (https://en.wikipedia.org/wiki/Global_Positioning_System#Timekeeping)
+* ONLY Front End GUI must use Time Zone offset - backend and device time must stay UTC/GPST.
+
 ## AVL Time State
 
 ```mermaid