devdocs/specs/core-time-and-dates.txt

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+TIME (DATE AND TIME handling)
+
+RAVEN stores all times and dates in UTC in DB and internally all is UTC
+User has a timezone offset setting which is used to format dates for display at the client
+Dates coming from the client are all assumed to be in UTC format (i.e. converted at the client from input)
+TimeZoneOffset is also used for relative date filters in list filter retrieval.
+    - i.e. "NextMonth" is assumed to be client relative, so the server will use their offset to calculate what next month meens to them in the query builder