The passage in 1968 of Public Law 90-363, also known as the “Monday Holiday Law,” changed the observance of Washington’s Birthday from February 22 to the third Monday in February. Because it occurs so soon after Lincoln’s Birthday, many states—such as Hawaii, Minnesota, Nebraska, Wisconsin, and Wyoming—combine the two holidays and call it Presidents’ Day or Washington-Lincoln Day. Some regard it as a day to honor all former presidents of the US. Discuss
Source: The Free Dictionary