>>I think I've read somewhere that once upon a time even 300 was used as the base, to simplify the calculation, which is, IMO, another euphemism for dirty trick.
>
>I remember that you could earn some extra interest by putting your money in the bank on February 28th, and withdrawing them the day after. Unles it was a leap year, you wold get the interest of three days instead of only one.

The old truth... you can beat the enemy with their own weapon :).