

I don’t think this is implemented in the standard datetime library, but in principle overriding sub is easily possible and you can define it as you’d wish.
However, I think subtracting a year is a bit ill defined, because it isn’t clear which year you’re subtracting given the leap year issue.










Do you need to flood/drain them? Our plants do quite well with regular watering inside their pots, without removing them from their spot.