known subclasses: kiwi.ui.search.Any, kiwi.ui.search.Today, kiwi.ui.search.Yesterday, kiwi.ui.search.LastWeek, kiwi.ui.search.LastMonth, kiwi.ui.search.FixedIntervalSearchOption, kiwi.ui.search.FixedDateSearchOption
Function | get_interval | Get start and end date.
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