What is the 55th day of the year?

The 55th day of the year is February 24 in a common year (non-leap year) and February 25 in a leap year. In a common year, January has 31 days, and February has 24 days, totaling 55 days by the end of February 24. In a leap year, January still has 31 days, but February has 25 days, making February 25 the 55th day.