Summary Duration (Core Services)

If specified in hours, minutes, seconds, or milliseconds, the summary durations will be evenly spaced UTC time intervals. Longer interval types are interpreted using wall clock rules and are time zone dependent. For example, an interval created with the string "24h" means using an evenly spaced 24 UTC hour interval between each event. On the other hand, an interval created with the string "1d" would return an interval shorter or longer than 24 hours if the interval encompasses a Daylight Savings Time change. When a positive duration is specified, the summary calculation begins at the earliest bounding time in the timeRange and applies the duration repeatedly in time ascending direction to generate the summary intervals. If a negative duration is specified, the summary calculation begins at the latest bounding time in the timeRange and applies the duration repeatedly in time descending direction to generate the summary intervals.

Note that the order of values returned will still be reflected by the timeRange, regardless of the summary duration sign.

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