Scheduling across time zones is deceptively easy to get wrong, and the classic result is a call that lands in the middle of someone's night. The mistakes almost always come from two things people don't expect.
How time zones actually work
Every zone is defined as an offset from a single global reference called UTC — a certain number of hours ahead of or behind it. Converting between two places is really just the difference between their offsets. One surprise: not every offset is a whole hour. India, for instance, runs half an hour off, and a few places use other fractions, which catches people who assume every zone is a neat hourly step.
The daylight-saving trap
Here's what causes most missed meetings: the gap between two cities isn't fixed. Many regions shift their clocks for daylight saving in summer, and they do it on different dates — or not at all. So for a couple of weeks around each changeover, the usual difference between two cities can be an hour off from what you expect. If you're relying on a memorised offset, that's exactly when you'll be wrong. This is why it's worth converting against the actual date rather than trusting “they're always five hours ahead.”
How to convert reliably
- Open the Time Zone Converter and pick the two zones.
- Enter the date and time — the date matters, because of daylight saving.
- Read the converted time, and when a meeting really matters, double-check against the specific date.
It uses your device's own clock and runs in the browser, so there's nothing to install and nothing sent anywhere.