When were time zones invented?

The concept of standardized time zones emerged in the 1870s and 1880s, driven by the expansion of railroad networks. Sir Sandford Fleming proposed a worldwide system of 24 hourly zones in 1879. The 1884 International Meridian Conference in Washington, D.C. established the Greenwich meridian as the prime meridian and laid the foundation for the modern time zone system.

Why is Greenwich the prime meridian?

Greenwich was chosen at the 1884 conference largely because the Royal Observatory there had been a global navigational reference for over a century, and the majority of the world’s shipping already used charts based on the Greenwich meridian. Practical inertia won the vote.

What is the IANA time zone database?

The IANA (Internet Assigned Numbers Authority) time zone database, also called the Olson database or tz database, is a comprehensive record of every time zone rule past and present. It is maintained by a volunteer community and is used by virtually every operating system, programming language, and smartphone on Earth.

A Brief History of Time Zones

July 9, 2026

Related Tools

Related Guides

Frequently Asked Questions

When were time zones invented?: The concept of standardized time zones emerged in the 1870s and 1880s, driven by the expansion of railroad networks. Sir Sandford Fleming proposed a worldwide system of 24 hourly zones in 1879. The 1884 International Meridian Conference in Washington, D.C. established the Greenwich meridian as the prime meridian and laid the foundation for the modern time zone system.
Why is Greenwich the prime meridian?: Greenwich was chosen at the 1884 conference largely because the Royal Observatory there had been a global navigational reference for over a century, and the majority of the world’s shipping already used charts based on the Greenwich meridian. Practical inertia won the vote.
What is the IANA time zone database?: The IANA (Internet Assigned Numbers Authority) time zone database, also called the Olson database or tz database, is a comprehensive record of every time zone rule past and present. It is maintained by a volunteer community and is used by virtually every operating system, programming language, and smartphone on Earth.