Timeline:December

December is the twelfth and final month of the year.

December 8 is the 342nd day of the year (343rd in leap years) in the Gregorian calendar. There are 23 days remaining.
 * '''2000: The Really Bad Day! premiered.

December 12 is the 346th day of the year (347th in leap years) in the Gregorian calendar. There are 19 days remaining.
 * 2001: Season 1 ended.
 * '''2001: Christmas Everyday! premiered.
 * '''2008: Merry Wishmas premiered.

December 25 is the 359th day of the year (360th in leap years) in the Gregorian calendar. There are 6 days remaining.
 * Christmas Day

December 29 is the 363rd day of the year (364th in leap years) in the Gregorian calendar. There are 2 days remaining.
 * 2000: "Meet the OddParents" premiered.
 * 20011: "Season 8" ended.

December 31 is the 365th (366th on leap years) and last day of the year (366th in leap years) in the Gregorian calendar.
 * New Year's Eve
 * 1999: "The Zappys!" premiered.