State offices shall be kept open for transaction of business from eight o'clock a.m. until five o'clock p.m. each day from Monday through Friday except:
1. On holidays.
2. In implementing an agency furlough if the department of administration has authorized the state office to be closed in order to meet the furlough requirements. An agency that receives this authorization shall ensure that appropriate notice is given to notify the public of the office closure.
3. As otherwise provided by law.