Tool
Date Across Timezones
See what calendar date and weekday it is right now across up to 12 cities 鈥?and the moments when they disagree.
Rollover order (which city crosses midnight first)
Today vs. tomorrow gap
What makes this different
The weekday strip and the rollover clock are the two unique parts. Most "what day is it" pages just show the date; we also show the rolling transition order (which city rolls to tomorrow first, second, third) and the gap between rollovers.
How to use it
- Pick your set of cities.
- Read the strip: each cell shows the local weekday and date, with a colour per weekday.
- The "rollover clock" under the strip shows the UTC instant at which the next city crosses midnight into a new date.
- Click a city to pin it; the strip will centre on its current wallclock.
If you work across a wide timezone spread, you already know that "today" is not a single concept. While you are still on Wednesday afternoon, your colleague in Tokyo may already be planning Friday's stand-up. This tool puts every city on a horizontal timeline so the gaps pop out visually, and flags the precise moment each city rolls over to a new date.
Frequently asked questions
Why is the rollover not perfectly aligned to UTC?
Each city rolls to a new date at the moment its local clock hits 00:00. That moment in UTC depends on the city's offset, which itself depends on whether the city is currently observing DST.
Does the rollover order change with DST?
Yes. For most cities it shifts by an hour twice a year. Cities that observe DST on the opposite hemisphere to the majority (most of Australia, New Zealand) can shift their position in the order significantly across the year.
Why do some cities share a date but different weekdays?
The strip colour-codes weekday, not just date. A Friday the 13th in Tokyo can be Thursday the 12th in San Francisco.