out = plus (A, B) ¶Addition (+ operator). Adds a duration, calendarDuration,
or numeric B to a datetime A.
A must be a datetime.
Numeric B inputs are implicitly converted to duration using
duration.ofDays.
WARNING: Arithmetic with calendarDuration arguments on datetimes in time zones which use Daylight Saving Time may be buggy.
Returns datetime array the same size as A.