Time Zone Difference Calculator
Find the hour difference between two time zones.
Results update as you type.
How it works
Coordinating across time zones is easier when you know exactly how many hours apart they are, and this calculator finds it from UTC offsets. You enter your UTC offset and the destination's UTC offset, and it returns the number of hours between the two zones and whether the destination is ahead of or behind you. Every time zone is defined by its offset from Coordinated Universal Time (UTC) — for example, US Eastern Time is UTC−5 in winter, and Central European Time is UTC+1 — and the difference between two zones is simply the difference of their offsets. A positive result means the destination is ahead (later in the day), which is typical when traveling east, while a negative one means it is behind (earlier), typical traveling west. This is invaluable for scheduling international calls and meetings, planning when to contact someone abroad, and figuring out arrival times across zones. Two things to watch: daylight saving time shifts many zones by an hour for part of the year, and it starts and ends on different dates in different countries, so offsets can change; and some zones use half-hour or 45-minute offsets, like India at UTC+5:30 or Nepal at UTC+5:45, which is why the calculator accepts fractional offsets. Enter both UTC offsets to find the time difference.
Difference = |offset₂ − offset₁|
The time difference between two zones is the absolute value of the difference between their UTC offsets. If the destination's offset is greater, it is ahead of you; if smaller, it is behind. UTC offsets can be fractional, since some zones differ by 30 or 45 minutes.
Source:UTC time zone offsets
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter your utc offset and destination utc offset.
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Time difference updates instantly as you type — no button to press.
Frequently asked questions
How do I calculate the time difference between two zones?
Subtract your UTC offset from the destination's UTC offset and take the absolute value for the number of hours apart. For UTC−5 and UTC+1, the difference is six hours. If the destination's offset is larger, it is ahead of you; if smaller, it is behind. The calculator handles the sign and shows the direction.
What is a UTC offset?
A UTC offset is how many hours a time zone differs from Coordinated Universal Time, the global time standard. For example, UTC−5 is five hours behind UTC and UTC+9 is nine hours ahead. Every time zone has an offset, and comparing two offsets gives the difference between the zones, which is what this calculator computes.
Does daylight saving time affect the difference?
Yes. Many regions shift their clocks forward an hour for part of the year, changing their UTC offset seasonally. Because countries start and end daylight saving on different dates, or not at all, the difference between two zones can vary through the year. Use the offsets that apply on the specific dates you care about for accuracy.
Why do some offsets have half hours?
Not all time zones align to whole hours. Some use 30-minute offsets, like India at UTC+5:30 or parts of Australia, and a few use 45 minutes, like Nepal at UTC+5:45. These reflect historical and geographic choices. This calculator accepts fractional offsets, so enter 5.5 for a 30-minute zone or 5.75 for a 45-minute zone to get the correct difference.
How do I use this for scheduling calls?
Find the hours difference and direction, then apply it to your local time to get the other person's local time. If you are at UTC−5 and they are six hours ahead, your 9 a.m. is their 3 p.m. Knowing the gap lets you pick a time that falls within working hours for both parties before scheduling an international call or meeting.