Jet Lag & Time Zone Calculator
Figure out what time you’ll actually land in local time, how many time zones you’re crossing, and roughly how long jet lag will take to shake off.
Time zone offsets shown are standard time and don't account for daylight saving -- actual local time may be off by an hour depending on the date.
Why Direction Matters More Than Distance
Jet lag isn’t really about how far you fly — it’s about how many time zones you cross and which direction. Flying west, your body gets a longer day, which is easier to adapt to. Flying east compresses your day, which is why an eastbound trip often feels harder even over a shorter distance.
A flight to New Zealand is a good example: you’re crossing a huge number of time zones, but landing local time can still work out reasonably close to a normal day depending on when you depart — the calculator above accounts for that.
Frequently Asked Questions
Does daylight saving time affect this?
Yes, by up to an hour depending on the date and destination. This tool uses standard time zone offsets as a baseline estimate.
What’s the single best thing to do about jet lag?
Get sunlight at your destination as early as possible after landing — it’s the strongest signal for resetting your body clock, more effective than most other tricks.
Planning a New Zealand trip specifically?
See our New Zealand Trip Prep guide for flight length and airline recommendations.