Time Banking

There’s probably a good sci-fi premise here. We've already got a movie about time bandits. And a bunch about time cops. There's probably a market for a movie about intertemporal bankers, taking deposits from George Washington in order to loan money to Winston Churchill. We’ll workshop it a bit and get back to you.

In the meantime, the term also applies to a system that uses working hours as a kind of currency. (It's more of a labor bank than a time bank, but we'll let that nitpick slide.)

Think of an Amish community. Your neighbor helped you build your barn. Now you owe him a favor when his barn burns down. Now formalize that concept a bit. Like...in a co-op daycare, where each parent has to work one shift a month as a helper.