On 4/26/2017 1:30 PM, Pietro Pugni wrote:
> Adding 10 years to 1912-02-29 returns 1922-02-29, as expected.
> I would like to apply the *reverse* operation. To do so, I subtract 10
> years from 1922-02-29 but I obtain 1912-02-28, so *the math is
> actually wrong*.
assuming 1922 was a leap year, 1912 is NOT a leap year, so therefore
there is no 1912-02-29, that is an invalid date.
--
john r pierce, recycling bits in santa cruz