The four-day workweek is ... working.

That’s the message emerging from the closely watched companies shifting to four-day workweeks in pilot programs run by the nonprofit 4 Day Week Global. A survey out Tuesday finds that 78% of leaders at the more than 70 U.K. companies that shifted to four-day schedules say their transition was good or "seamless.” Only 2% found it challenging. Most (88%) say that four-day schedules are working well.

The idea of a four-day workweek is no joke. California lawmakers recently considered, and then shelved, plans for a statewide four-day workweek for some employees. A survey by Gartner Inc. found a shorter week to be a favored recruitment and retention strategy.