Unless today is May 6th and you are in the United States then today is NOT National Nurses Day and this is Bollocks!
Source: https://www.timeanddate.com/holidays/us/national-nurses-day
However, if today is May 12th then it may well be International Nurses Day!
Source: Wikipedia – International Nurses Day
Probably a good idea to use the international version on a global medium such as FaceBook.