A time bank does with time what other banks do with money: It stores and trades it. "Time banking means that for every hour you give to your community, you receive an hour credit," explains Krista Wyatt, executive director of the DC-based nonprofit TimeBanks.Org, which helps volunteers establish local time banks all over the world. Thousands of time banks with several hundred thousand members have been established in at least 37 countries, including China, Malaysia, Japan, Senegal, Argentina, Brazil and in Europe, with over 3.2 million exchanges. There are probably more than 40,000 members in over 500 time banks in the US. Many time banks are volunteer community projects, but the one in Sebastopol, [CA] is funded by the city. "Every volunteer hour is valued around $29," Wyatt calculates. "Now think about the thousands of dollars a city saves when hundreds of citizens serve their community for free." The Sebastopol time bank has banked more than 8,000 hours since its launch in 2016. Five core principles ... guide time banks to this day: First, everyone has something to contribute. Second, valuing volunteering as "work." Third, reciprocity or a "pay-it-forward" ethos. Fourth, community building, and fifth, mutual accountability and respect. "What captured me is that people are doing things out of their own good heart," Wyatt says. "Many years ago, a woman ... said to [civil rights lawyer] Edgar Cahn, 'I have nothing to give.' Edgar Cahn listened and finally responded, 'You have love to give.' And the whole room just went silent." Every hour of service is valued the same, no matter how much skill and expertise a task takes, whether it's an hour keeping someone company, helping them file their taxes or repair a roof.