It encapsulates some date operations like sum. The result will be the
calculated date when calling the nextDateByInterval method, given the
date, periodicity, and skipInterval parameters.
For example, given a date of 2019-12-31, monthly periodicity, and skip
interval 0, the results will be 2020-01-31. Also, if the skip interval
is 1, the result is 2020-02-29. This is because the next date will add
another month to the current range.
All these strategies encapsulate how the Carbon library adds the
interval to the current date.
Monthly, Quarterly, Half-Yearly, and Yearly explicitly use the
overflow control to guarantee the end of the next month or year
adequately.
