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Sri Lanka Jet Lag Calculator
Calculate jet lag when flying to Sri Lanka. Estimate recovery time, sleep adjustment and acclimatisation days based on +5.5 hours UTC offset.
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- Evergreen — the math doesn't change
Your home timezone's UTC offset — the model anchors 0 at London (UTC±0). New York −5, Tokyo +9.
Destination time zone: UTC+5.5 (Colombo).
Recovery estimate uses the rule of thumb: 1 day per zone eastbound, 1.5 zones per day westbound. Individual variation is large.
Sri Lanka does not observe daylight saving; the base offset for jet-lag math is 5.5 year-round.
Live destination data
Real-time weather, UV, sun times and country facts — refreshed automatically from public, no-key APIs.
Capital weather
Colombo
Country facts
LKLK
Colombo keeps its clocks at UTC+5.5, which puts Sri Lanka 5.5 hours east of London's UTC+0 baseline. Plan on about 5.5 recovery days from London (10.5 from New York) before Sri Lanka stops feeling like a time warp. The tool above personalises the estimate for Colombo.
1. Time Zone Difference to Sri Lanka (UTC+5.5)
| Home city | Home offset | Shift to Colombo | Typical recovery |
|---|---|---|---|
| London | UTC+0 | 5.5 h east | 5.5 days |
| New York | UTC-5 | 10.5 h east | 10.5 days |
| Tokyo | UTC+9 | 3.5 h west | 2.3 days |
| Sydney | UTC+10 | 4.5 h west | 3 days |
Shifts use standard offsets; Colombo runs UTC+5.5 as the Sri Lanka reference time.
Swipe sideways to see the full table
The size of your Sri Lanka jet lag is the absolute gap between your home offset and Colombo's UTC+5.5. London departures face 5.5 hours, New York 10.5, Tokyo 3.5 and Sydney 4.5 — each figure feeds the recovery estimate for Colombo at UTC+5.5.
Sri Lanka keeps a single reference offset of UTC+5.5 across Colombo, so the mental math never changes mid-trip. Reference frame for Sri Lanka: Colombo keeps UTC+5.5 and sits 7 m above sea level in South Asia, with that same offset in every season.
2. Recovery Plan for Sri Lanka: ~5.5 days from London
| Shift crossed | Eastbound recovery | Westbound recovery |
|---|---|---|
| 3 h | 3 days | 2 days |
| 5 h | 5 days | 3.3 days |
| 8 h | 8 days | 5.3 days |
| 12 h | 12 days | 8 days |
Rule of thumb: about one recovery day per zone eastbound, 1.5 zones per day westbound. Individual variation is large; the Sri Lanka calculator above refines this from your home offset.
Swipe sideways to see the full table
Day one in Colombo: sunlight before midday. Meals go on the local clock in Sri Lanka, and lights-out stays no earlier than 9:30pm so the body accepts the new zone. Three levers run the Sri Lanka recovery: light, sleep timing and hydration.
Start with pre-flight drift for Sri Lanka — 30–60 minutes per day toward Colombo time. Hold the line in the air for Sri Lanka: water instead of wine. Caffeine before noon only, and set the watch to Colombo time, UTC+5.5.
Direction changes the bill: flying to Sri Lanka eastward from London costs about 5.5 days of recovery. The westward routing to Colombo costs only 3.7 — the body clock delays to Sri Lanka more easily than it advances. Applied to this South Asia trip: 5.5 hours east from London to Colombo maps to about 5.5 reset days, so a Sri Lanka itinerary should front-load outdoor time on days one to 6.
3. Sleep Hygiene Tips for Sri Lanka
Near-4am wakings are part of night one in Colombo (7 m, UTC+5.5); stay dark and still, skip the clock-checking, and Sri Lanka nights settle by the third. For shifts over six hours — into Sri Lanka, that means the 5.5-hour London gap — 0.5–3 mg of melatonin at Colombo bedtime (UTC+5.5) pulls the clock faster in 3–4 nights. Clear Sri Lanka dosing with a clinician first.
Cap naps at 20–30 minutes and finish them by 3pm Colombo time (UTC+5.5); anything longer steals the night that actually resets your clock to Sri Lanka. Practical baseline: lights out in a dark 16–20°C Colombo room (7 m, UTC+5.5), and no evening alcohol for the first two nights while the Sri Lanka clock settles.
Calculation Formula
Recovery days ≈ |destination offset − home offset| / 1 (per day eastward, 1.5 westward)How to Use This Calculator
- Enter your home UTC offset in hours (default 0 = London).
- Set your flight duration in hours (default 8).
- Pick your direction of travel: Eastward or Westward.
- Read the time-zone difference to Colombo, recovery days estimate and recommended sleep-adjustment schedule.
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