Line up cities on a shared timeline, build a world clock list, or browse the map. Your converter layout can be shared from the address bar.
The day runs from midnight to midnight in your home zone (house icon). Hover the timeline for a quick preview, click to choose an hour, then drag the ends to widen or narrow the window in 30-minute steps. Add cities from the list and send the page link to share the same view.
Search for a city or place, or explore colored regions on the map. The bar along the bottom is a UTC guide by longitude; hover a segment to highlight matching areas. Red dots mark zone centers (you can hide them). Save places to compare local times and offsets side by side.
Search for a city first, then add places to your list. Each row shows live local time, offset vs UTC, and offset vs home. Tap the house icon on a row to make that place home, or open Change home in the list header for any zone. Home defaults to your browser time zone; the info button explains how that works.
The Uptool home lists more free browser tools, including date calculators and new utilities as we ship them.
Free to use
Every tool here is free: no paywall, no account. Open a page and use it in the browser.
The time zone converter lines up several cities on one draggable timeline so you can compare local times for remote calls, travel handoffs, and release windows. It behaves like a lightweight meeting planner across time zones: add zones, pick a calendar day, then share the URL so everyone sees the same grid. The world clock is a simple list: search cities, save them, read live local time, offset vs UTC, and offset vs a home zone that defaults to your browser time zone. The time zone map pairs a fixed Mercator world view with city search, approximate colored regions, a UTC-by-longitude guide strip, and a saved list that shows local time and offset vs UTC for each place. Filters and search help you pick a mode; favorites and layout stay on this device only.
