About WorldTimeNow

WorldTimeNow is a utility site for checking the current time in cities and time zones, converting a local date and time, and comparing clocks. It is built for fast lookups, not for storing accounts or precise locations.

How current time is calculated

Each clock is an instant in UTC formatted with the JavaScript Intl API and an IANA timezone identifier such as Asia/Kolkata or America/New_York. The server does not use its own local timezone as the source of truth. Live clocks update in the browser every second after the first render.

Why IANA timezone identifiers are used

Abbreviations such as IST, CST, and BST are ambiguous. IANA names are unique and carry daylight-saving history. Conversion on this site always goes through those identifiers, even when a page is titled with a familiar abbreviation.

How timezone conversion works

A wall-clock time in the source zone is turned into a UTC instant using that zone’s offset at that moment, including DST. The instant is then formatted in the destination zone. Start and end dates for daylight saving are not hardcoded.

How to use the tools

Search from any page to open a city, country, or abbreviation. Use the converter when you have a specific date and time. Use time difference when you only need how far apart two cities are. Use the world clock to keep several cities visible.