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