#### 8.2.2.6 calendarDuration.plus ¶

Method: `out =` plus `(A, B)` ¶

  Addition: add two `calendarDuration`s.

  All the calendar elements (properties) of the two inputs are added together. No normalization is done across the elements, aside from the normalization of NaNs.

  If B is numeric, it is converted to a `calendarDuration` using `calendarDuration.ofDays`.

  Returns a `calendarDuration`.