First Decade of DST Changes by Time Zone

Daylight Saving Time (DST) was first introduced during World War I as a way to conserve energy by making better use of daylight. The concept was first proposed by George Hudson in 1895, but it wasn't widely adopted until the war. DST has since been implemented in many countries around the world since April 30, 1916, although the dates and rules vary by region. In this example, we explore the first decade of time changes detected by the Intl API for various time zones, focusing on the first DST transition.