Holidays shall be observed as provided below:

(a) For employees with workdays of 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 workday after the day off;

(2) workday it is observed on that workday.