28 years, and I never bothered to remember how many days there are in each month of the year.

I know there are 31 in October, December, January, and there are 28 days in February in a non-leap year. But that's about the extent of my certainty. Let me go consult my calendar...

You'd think that the number of days per each month is an important, significant, and reliable enough lump of information for me to have committed to my memory by now.