On 1 January 45 BC, by edict, Julius Caesar reformed the historic Roman calendar to make it a consistent
Prior … See more

In the Gregorian calendar, the standard calendar in most of the world, almost every fourth year is a leap year. Each leap year, the month of February has 29 days instead of 28. Adding one extra day in the calendar every four … See more

The intercalary day that usually occurs every four years is called leap day and is created by adding an extra day to February. This day is added to the calendar in leap years as a corrective measure because the Earth does … See more

The Baháʼí calendar is a solar calendar composed of 19 months of 19 days each (361 days). Years begin at Naw-Rúz, on the vernal equinox, on or about 21 March. A period of "Intercalary Days", called Ayyam-i-Ha, … See more

The Revised Bengali Calendar of Bangladesh and the Indian National Calendar organise their leap years so that every leap day is close to 29 February in the Gregorian calendar and vice versa. This makes it ea… See more