A time zone converter that lives on your desktop
Type a time, pick the city it belongs to, and every clock on your desktop shows the matching time. There’s no tab to open and no connection needed, and it gets daylight saving right.
Free for Windows 10 and 11, x64, about 90 MB. It isn’t code-signed yet, so SmartScreen may warn you the first time (what to do).
- Free
- Works offline
- 15-minute scrubbing
- Daylight saving aware
Try it here
Type a time or drag the slider. Then keep it on your desktop.
Type a time in any city
The converter sits in the top bar and reads like a sentence: “If it’s [time] in [city]”.
- Type the time. In the top bar, type a time such as 3pm, 9:30 or 15h30.
- Pick the city. Choose the city that time belongs to. Every card converts, with +1 day or -1 day where the date changes.
- Share it. Select Copy times to put every converted time on the clipboard, then Back to now to return to the current time.
| You type | It reads |
|---|---|
| 9 | 09:00 |
| 930 | 09:30 |
| 9:30 or 9.30 | 09:30 |
| 3pm | 15:00 |
| 3:15pm | 15:15 |
| 15h30 | 15:30 |
| 12am | 00:00 |
Anything else gets a gentle hint: “Type a time like 9, 9:30, 930 or 3pm”. You can also double-click a card, or press Enter on it, to convert from that city.
Or scrub through the day
No typing at all: scroll over the clocks and watch every city move together.
Mouse wheel
Turn the wheel over any card and every clock moves in 15-minute steps. One notch is one step, at any display scaling.
Day line
Drag along the line at the bottom of a card to slide through that city’s day.
Keyboard
[ and ] move 15 minutes, Page Up and Page Down an hour.
Back to now
One button returns every clock to the current time.
Example conversions
These are the times the app shows for these dates. The dates matter: offsets move with daylight saving time.
| City | Time | UTC offset |
|---|---|---|
| Lisbon | 14:00 | UTC+1 |
| London | 14:00 | UTC+1 |
| Berlin | 15:00 | UTC+2 |
| San Francisco | 06:00 | UTC-7 |
| São Paulo | 10:00 | UTC-3 |
| Mumbai | 18:30 | UTC+5:30 |
| Singapore | 21:00 | UTC+8 |
| Tokyo | 22:00 | UTC+9 |
| Sydney | 23:00 | UTC+10 |
| City | Time | Day |
|---|---|---|
| Tokyo | 07:00 | Thursday |
| London | 23:00-1 day | Wednesday |
| New York | 18:00-1 day | Wednesday |
| San Francisco | 15:00-1 day | Wednesday |
| City | Time | UTC offset |
|---|---|---|
| Mumbai | 13:30 | UTC+5:30 |
| Kathmandu | 13:45 | UTC+5:45 |
| Tehran | 11:30 | UTC+3:30 |
| Adelaide | 17:30 | UTC+9:30 |
| St. John’s, Newfoundland | 05:30 | UTC-2:30 |
| Chatham Islands | 20:45 | UTC+12:45 |
Midnight, other days and the new year
When a city is on a different day, its card says +1 day or -1 day. The end of the year is no different: 17:00 on 31 December 2026 in San Francisco is 01:00 on 1 January 2027 in London and 14:00 in Auckland, both +1 day.
To convert a time on another day, use the date shortcuts: Today, Tomorrow, then the next five days by name. They count from the source city’s calendar, so “Tomorrow” means tomorrow in the city you typed the time for.
Daylight saving time, done right
Most conversion mistakes happen around clock changes. Each conversion uses the rules for its own date, so these come out right:
The weeks when offsets shift
Europe turns its clocks back on 25 October 2026 and the US on 1 November. In between, 9:00 in New York is 13:00 in London, not 14:00.
Times that don’t exist
On 14 March 2027, New York jumps from 02:00 to 03:00. Type 2:30 for that day and the app moves it forward by the gap, to 03:30, the same way Windows does.
Times that happen twice
On 1 November 2026, 01:30 comes round twice in New York. The app takes the first one, 01:30 EDT, which is 05:30 in London.
A note before it happens
In the week before a change, the card says so, for example “Clocks +1h tomorrow”. Hover the note for the exact date and time.
See who’s likely asleep
While you’re converting, any city where it’s between 22:00 and 07:00 dims and shows a moon. It’s a quick way to spot the teammate you’d be calling at 05:30.
The card’s day and night colors still follow the real sun. Lisbon at 21:30 in late September is already dark (the sun set at 19:33), but it only gets the moon from 22:00.
Copy the result
Copy times puts every converted time on the clipboard as plain text, one city per line, in the order of your cards. For the screenshot above, it pastes this:
When it is 16:30 in New York: 21:30 Lisbon · Wed, Sep 23 21:30 London · Wed, Sep 23 16:30 New York · Wed, Sep 23 13:30 San Francisco · Wed, Sep 23 05:30 Tokyo · Thu, Sep 24 +1 day 06:30 Sydney · Thu, Sep 24 +1 day
Need just one city? Right-click its card and choose Copy time.
More about Open World Clock
Put the world on your desktop
Completely free for Windows 10 and 11. Open source, no account, no ads, no telemetry.
Free for Windows 10 and 11, x64, about 90 MB. It isn’t code-signed yet, so SmartScreen may warn you the first time (what to do).