This is a thin wrapper around a lubridate floor date that works for hms yearmon and yearqtr classes as well. Note that this is in line with the behavior of r s base round posixt function but does not follow the convention of the base base round function which rounds to. Math with date times lubridate provides three classes of timespans to facilitate math with dates and date times a within b does interval or date time a fall within interval b.
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