21 years.
Chat with our AI personalities
13 years
There are 13 leap years during that period:2000200420082012201620202024202820322036204020442048
There have been eight (8) leap years from 1978 to 2010.(The next one is 2012):19801984198819921996200020042008
There 400 years between them.
Between those years there are four.