On Valentine's Day in 1996, there was a snail (his name is Herb) at the bottom of an empty well that is 30 feet tall. The well had run dry, but it had slippery, moss covered walls. So, during the day (he woke up at 6am), Herb was able to climb 3 feet up, but while he slept at night (he went to sleep at 10pm), he slipped back down 2 feet.

On what date did Herb get out of the well?