Fun with Timezones

(Everything you never wanted to know about timezones)


Jordi Boggiano
@seldaek

A Short History of Timezones



History

A long time ago Solar time / sundial

1675 Greenwich Mean Time at observatory for navigation

Early 1800s Clocks introduced, local mean solar time in every village

1847 Railway Time in UK (= GMT)

1855-1880 All British clocks on GMT

~1900-1930 GMT-based timezones normalization

1960 Coordinated Universal Time (UTC)

Properties of a Timezone

A day = One full rotation of the globe

A day = One full rotation of the globe



24 hours in a day = 24 timezones around the globe

Kind of...