Jet Lag Planner
Enter itinerary zones and resolve repeated times; select travel direction, phase and a user rate or dated sleep plan.
A QUICK WALKTHROUGH
How to use this tool
- Enter itinerary zones and resolve repeated times; select travel direction, phase and a user rate or dated sleep plan.
- Manual rows must have increasing dates; adjustments follow the selected phase and cannot exceed it. Every row includes its actual sleep instant.
Arithmetic model
Planning days = ceil(abs(selected phase)/user hours per day). Calendar rows retain signed steps, remaining phase, local sleep times and UTC instants. No automatic recovery date is predicted. Calendar uses nominal local dates plus cumulative signed sleep adjustments; dates can roll over. Sleep instants use millisecond precision; displayed arithmetic keeps the full computed Number value. The shortest-phase tie at 12 h is −12 h. DST gaps are rejected; repeated times require earlier/later selection. The browser timezone database version is not exposed.
Supported: 1900–2100; phase ±48 h; rate >0 to 24 h/day; maximum 3660 calendar rows.
All time zones, travel direction, phase and adjustment assumptions are supplied by you. Browser Intl timezone rules; local processing.
PARTIAL: automatic individual medical recovery prediction is unavailable. This is arithmetic planning, with no light or medicine recommendation.
Manual rows must have increasing dates; adjustments follow the selected phase and cannot exceed it. Every row includes its actual sleep instant.
GOOD TO KNOW
Common questions
Does this predict personal recovery?
No. User assumptions determine the arithmetic schedule. Sleep history, physiology and clinical suitability are not modeled.