In economics, a time-based currency is an alternative currency where the unit of exchange is the person-hour.
Time Banks value everyone's contributions equally: one hour equals one service credit. In these systems, one person volunteers to work for an hour for another person; thus, they are credited with one hour, which they can redeem for an hour of service from another volunteer.
As a philosophy, time banking is founded upon five principles, known as Time Banking's Core Values: - Everyone is an asset - Some work is beyond a monetary price - Reciprocity in helping - Social networks are necessary - A respect for all human beings
There are many hundreds of Time Banks across the world. You can find a map of known Time Banks internationally over at timebanks.org 
# Implementations
There have been some early (2014) experiments looking to implement a **Time Bank** using smart contracts, though as far as I know none were ever tried with real communities. Gas prices make this impractical - blogspot.se
Here we are collecting notes about the learning time bank. If you have any comments or suggestions please add to the following Hack pad - hackmd
# See also - Learning Timebank - Global Time Bank and Intergalactic Time Bank