Overview
The World Time Zones tool displays live, updating local times for 24 major cities across all global time zones. It automatically detects your local timezone, shows day/night status for each city, and includes a search filter to quickly find any city.
How to Use
Your local time appears at the top of the list automatically. Scroll to browse all 24 cities. Use the search box to filter by city name, country, or timezone code. Toggle between 12-hour and 24-hour format. Each city card shows the current time, date, timezone abbreviation, and a sun/moon icon indicating whether it is daytime or nighttime there.
Background & Context
Before standardized time zones, every city kept its own local solar time, making rail scheduling nearly impossible. Time zones were first standardized at the International Meridian Conference in 1884, dividing the world into 24 zones based on the Greenwich Meridian. Today there are actually over 40 distinct UTC offsets, including half-hour offsets like India (UTC+5:30) and Nepal (UTC+5:45).
