Day Based
A date-time unit equal to some number of calendar days.
A calendar day is not considered identical to 24 hours, thus a DayBased
-unit cannot be expressed as a multiple of some TimeBased-unit.
The reason lies in time zone transitions, because of which some days can be 23 or 25 hours. For example, we say that exactly a whole day has passed between 2019-10-27T02:59
and 2019-10-28T02:59
in Berlin, despite the fact that the clocks were turned back one hour, so there are, in fact, 25 hours between the two date-times.
Functions
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Produces a date-time unit that is a multiple of this unit times the specified integer scalar value.