1665/1666
For 1665/1666, the key weeks and dates were:
Week 1: 19 December to 26 December 1665
New Year 1666, Week 2: 26 December to 2 January 1665
Legal New Year, Week 14: 20 March to 27 March 1665
Week 52: 11 December to 18 December 1666
Of note, the Great Fire of London occurred September 2 through September 5, 1666, during Weeks 37 and 38. Weeks 37, 38, and 39 are combined due to the fire and its aftermath.
