The First Day of Summer(sumardagurinn fyrsti) is an annual public holiday in Iceland held on the first Thursday after 18 April and between April 19th to April 25th. In former times, the Icelanders used the Old Norse calendar which divided the year into only two seasons, winter and summer. The people counted their age in winters rather than in years. It is not a religious holiday, but before 1744, mass was held on this day. Although the climate in late April cannot be considered to be summer-like, after the long winter, Icelanders still celebrate this first day of "summer" with parades, sporting events and organized entertainment, held in various places around Iceland.