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Time zone difference calculator 2026
Have you ever called a friend abroad only to wake them up in the middle of the night? Or tried to schedule an online meeting with a business partner in Tokyo without knowing what time it was on their end? Our time zone difference calculator solves these problems in seconds. The calculator covers 23 major cities spanning all key time zones — from Los Angeles (UTC-8) through London (UTC+0), Warsaw (UTC+1), Dubai (UTC+4) all the way to Tokyo (UTC+9) and Sydney (UTC+10). Simply select two cities, enter the current hour and minutes in the first city, and the calculator instantly shows you the corresponding local time in the destination city. The tool uses static UTC offsets corresponding to standard (winter) time. Keep in mind that many countries observe Daylight Saving Time (DST), which can shift the actual time difference by ±1 hour during certain periods of the year. A DST reminder is always shown in the results so you are never caught off guard. The calculator is perfect for: remote workers collaborating with global teams, travellers wanting to reach family and friends without disturbing them, entrepreneurs scheduling international video calls, and anyone curious about what time it is on the other side of the world right now. It is completely free, requires no registration, and works on all devices including mobile phones and tablets. Use the results to plan your communications smartly: identify overlapping working hours, avoid calling during sleep time, and coordinate across continents with confidence.
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How we calculate the time difference
Each city has a fixed UTC offset representing standard (winter) time. Time difference = UTC offset of city 2 − UTC offset of city 1. Time in city 2 = time in city 1 + difference. If the result is negative, add 24 (previous calendar day); if the result is 24 or more, subtract 24 (next calendar day). Minutes remain unchanged. Sample UTC offsets: Warsaw +1, London 0, New York −5, Los Angeles −8, Dubai +4, Moscow +3, Tokyo +9, Sydney +10. Important: the calculator does not automatically apply Daylight Saving Time (DST) — in summer, some differences may be ±1 hour different from the displayed result.
Example: Warsaw → Tokyo, 14:30 local time
Set city 1 to Warsaw (UTC+1) and city 2 to Tokyo (UTC+9). Enter the time in Warsaw as 14:30. Calculation: difference = 9 − 1 = +8 hours. Time in Tokyo = 14 + 8 = 22:30. Result: it is 22:30 in Tokyo — late evening. A short call is feasible, but for a longer meeting you may want to choose an earlier slot. Another example: New York (UTC-5) and London (UTC+0). Difference = 0 − (−5) = +5 hours. If it is 09:00 in New York, it is already 14:00 in London — mid-business day on both ends. This is an ideal window for transatlantic business calls since both parties are in working hours.
Frequently asked questions about time zones
What is a time zone and what is UTC?
A time zone is a region of the Earth that observes a uniform standard time. UTC (Coordinated Universal Time) is the primary time reference — all time zones are offset from it by whole or half-hour increments. Poland in winter is UTC+1 and in summer UTC+2 (Daylight Saving Time, DST).
What is the time difference between Poland and New York?
Using standard (winter) time, Poland is UTC+1 and New York is UTC−5, giving a difference of 6 hours — Poland is 6 hours ahead. In summer the gap can change by ±1 hour because Poland and the US switch to DST on different dates.
What is Daylight Saving Time (DST) and how does it affect the time difference?
DST involves moving clocks forward by 1 hour in spring and back in autumn. Not all countries observe DST — Japan, China and the UAE, for example, do not change their clocks. Our calculator uses fixed standard-time offsets, so the actual difference in summer may be ±1 hour for countries that observe DST.
What is the best time to call someone abroad?
Enter your current time, select the destination city and check the local time shown. A safe calling window is generally 09:00–21:00 local time for the other person. For example, if it is 14:00 in Warsaw, it is 21:00 in Tokyo — still acceptable for a call, but the evening is drawing to a close.
How bad is jet lag on a flight from Poland to Japan?
The difference between Poland (UTC+1) and Tokyo (UTC+9) is 8 hours. Travelling eastward (to Japan) requires your body to advance its circadian rhythm — jet lag is generally more severe when flying east than west. Adjusting meal times and sleep to the destination time zone a few days before departure can help.
Do all cities in a country share the same time zone?
Not always. The USA has 6 main time zones — New York is UTC−5, Chicago UTC−6, Los Angeles UTC−8. Australia has several zones (Sydney UTC+10, while central Australia uses UTC+9:30). China officially uses a single zone (UTC+8) despite its vast territory.
How do I calculate the time in another city manually?
Find the UTC offset of both cities, compute the difference (offset2 − offset1) and add it to your current time. If the result is negative add 24 (previous day); if ≥ 24 subtract 24 (next day). Our calculator does this automatically — just select two cities.
What is the largest time difference between cities on the list?
The largest gap between cities on our list is 18 hours — between Los Angeles (UTC−8) and Sydney (UTC+10). When it is Monday 08:00 in Los Angeles, it is already Tuesday 02:00 in Sydney.
Why does India use a half-hour offset (UTC+5:30)?
India uses UTC+5:30 — a non-standard half-hour offset. This was a historical decision to keep a single nationwide time that stays reasonably close to solar noon across the subcontinent. In our calculator Mumbai is simplified to UTC+5 (standard time).
How should I plan online meetings across multiple time zones?
Enter your planned meeting time and check what time it corresponds to in each participant's city. Best practice is to find an overlapping business window, e.g. 14:00–16:00 Warsaw corresponds to 08:00–10:00 in New York and 21:00–23:00 in Tokyo. Tokyo may be too late — consider splitting sessions into two separate time slots.
This calculator uses static UTC offsets (standard/winter time). It does not automatically account for Daylight Saving Time (DST). The actual difference in summer may be ±1h for countries that observe DST.