In the Gregorian calendar, it was the 1999th year of Anno Domini; the 999th year of the 2nd millennium; and the 99th year of the 20th century.
It was the 1999th year of Anno Domini. This was in the Gregorian calendar. It was the 999th year of the 2nd millennium. This was in the Gregorian calendar. It was the 99th year of the 20th century. This was in the Gregorian calendar.