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Where you're flying from and to becomes the real hour shift, the direction that makes it harder or kinder, an adjustment estimate from the standard rule of thumb — and a light plan for the first days, because light is the lever that actually moves a body clock.
Set what you want and the result appears as you go. Nothing needs uploading because there is nothing to upload — you are describing what to make, not sending us anything.
Your browser does all the work locally, using your own operating system where randomness is involved. Nothing is requested from a server, so nobody else has a copy of what you made.
The answer appears on this page as you go. There is nothing to download, because the answer IS the page — screenshot it or write down what matters. Nothing is kept — refresh the page and it’s gone, so take what you need before you leave.