Four-day week of work on Fridays. In 2016, a IT company in Romania, declared Monday as a day-off. As a result of reducing with 20% of working time, Friday has become much more productive. The employees said that three days off actually means 50% more free time then before. In New Zealand, trust company Perpetual Guardian announced in February 2018 that it would begin trialing a four-day work week in March 2018. Unlike many four-day week initiatives which require staff to work longer days for the same pay, or receive less pay, Perpetual Guardian’s plan, instigated by founder Andrew Barnes, saw the
Eight-day week popularity of the seven-day rhythm won and the eight-day week disappeared. The cycle of seven days, named after the sun, the moon, and the five planets visible to the naked eye, was already customary in the time of Justin Martyr, who wrote of the Christians meeting on the Day of the Sun (Sunday). Emperor Constantine eventually established the seven-day week in the Roman calendar in AD 321. The Celts used periods of darkness such as night and winter to begin their calculations of time. This meant that the first period of time in a "week" was a night, followed by