I received an email with a sig that contained this:
It's is not its, it isn't ain't, and it's it's, not its, if you mean it is. If you don't, it's its. Then too, it's hers. It isn't her's. It isn't our's either. It's ours, and likewise yours and theirs.
It's it's usage made clear.
Friday Night Bike Ride
2 hours ago