About Oneturn

Oneturn is a set of time tools built around one dial. The timer shows the time left, the stopwatch the time gone by, and the alarm the time until it rings, all as a band on the dial. The world clock gives each city's time difference and its next daylight saving change.

What it does

• Timer: turn the dial or type hours, minutes and seconds; run up to 8 at once. The end time is saved, so a refresh does not reset it.
• Stopwatch: hundredths of a second, lap and total time, fastest and slowest lap, copy and CSV export.
• Alarm: set a time and this page rings. Snooze for five minutes; missed alarms are flagged.
• World clock: 122 cities, the next clock change for each, and the hours when everyone is at work.

What it cannot do

It is a web page, so it cannot ring after you close the tab or the device sleeps. Phones may pause the page when the screen turns off. Use your phone's clock app for an alarm you cannot miss.

Time zone data

City times come from the time zone database built into your browser (IANA). The 2026 rule changes for three Canadian provinces and Morocco are applied by this site even if your browser's data is older (IANA change log, checked Oct 14, 2026). The tests compare every city's time zone with Python's zoneinfo.

Who makes it

Made by Lumen Lab. Found a mistake or want a feature? Write to woxocoso@gmail.com. More tools at lumenlab.page.