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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Normally you sync the clock one or two times per day from the NTP server. Then you calculate the time from the time passed since last sync. If you are using the arduino ecosystem you can use this library. Otherwise you have to implement the NTP client and a timer based on interrupts.
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