In what year did Germany start Daylight Saving Time?

Daylight savings time was first observed in Germany during World War I. It began on the last Sunday of April 1916 11:00 PM central European Time. The clocks were set back on the first Sunday in October at 1:00 AM Central European Savings Time.
In 1917 and 1918 the rules were slightly different occurring at 2:00 and 3:00 AM on the third Mondays of April and September respectively. The practice was discontinued until WWII when it was reestablished. [de.wikibedia.org]