1883 CE
Standard Time Adopted By Railroads
About this moment
Standard time is the synchronisation of clocks within a geographical region to a single time standard, rather than a local mean time standard. The term is also used to contrast with daylight saving time, a period of the year when clocks are shifted ahead one hour, supposedly to make better use of daily sunlight from spring to fall. Applied globally in the 20th century, the geographical regions became time zones.