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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.
Use NodaTime. It's really nice to work with. It allows to store LocalTime (i.e. time of day). And then convert it to ZonedDateTime using some given LocalDate and DateTimeZone, which will adjust correctly for things like daylight savings. You can also easily convert a ZonedDateTime to UTC if needed or an unambiguous Instant which can be converted to any other time zone.
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