The Public Holidays Act requires that when these holidays fall on a Tuesday or Wednesday, the public holiday will be observed on the Monday before the actual day. When it falls on a Thursday, Friday, Saturday or Sunday, the public holiday will be observed on the following Monday.
In addition, the birthdays of the reigning Sovereign of Tonga and the Heir to the Crown of Tonga shall be celebrated on the day it falls, unless it falls on a Sunday in which case it would be celebrated on the following Monday.