Holidays shall be observed as provided below:

(a) For employees with workdays on Monday through Friday, if a holiday falls on:

(1) Saturday, it is observed on the Friday preceding the holiday;

(2) Sunday, it is observed on the Monday following the holiday:

(3) Workday, it is observed on that workday.

(b) For employees with workdays other than Monday through Friday, if a holiday falls on a:

(1) Day off, it is observed on the first work- day after the day off;

(2) Workday, it is observed on that workday.