When Was The Gregorian Calendar Adopted. Slower to embrace the change were china (1912), bulguria (1916),. When was the gregorian calendar adopted?
By 1582 the dates on calendars were out of sync with the solar calendar by as much as ten days, and with each cycle of four years only compounding the issue, pope gregory xiii decided it. Russia only accepted it after the revolution of 1918, and greece waited until 1923 to follow.