ParseRange parses either an explicit range or an implicit range starting at the beginning of s.

RangeFromTimes returns a Range from two times.

ReplaceAllRangesByFunc replaces all dates and date ranges within the string s by the result of calling f on the parsed date/range and the substring src that gave rise to it.

Range is a time range as a half-open interval.

RangeFunc is a function that can make a Range, given a reference time and a default direction.