28 (because 1990 is not evenly divisible by 4)
February 1990 had 28 days.
Between November 1, 1962 and February 28, 1990 inclusive, there were 9981 days.
Including the start and end dates in the calculation, there are 7272 days between the two dates.
13
February 1930, had 28 days.
There was 29 days in February of 1836.
February 2000 had 29 days.
February 1971, had 28 days.
February 2010 had 28 days.
February 1986 had 28 days.
There are 28 days in February 2011.
In 2002, February had 28 days.