Time Zone Difference Calculator
Convert a time between two UTC offsets.
e.g. New York = -5
e.g. Madrid = +1
24-hour format
Results update as you type.
How it works
Coordinating across time zones is a constant challenge for remote teams, travellers, and anyone scheduling international calls, and this time zone difference calculator makes it simple by working from UTC offsets. You enter the source zone's offset from UTC, the destination zone's offset, and a clock time in 24-hour format, and it returns the converted time in the destination zone, the number of hours difference between the two, and whether the conversion crosses into the previous or next day. Time zones are defined by their offset from Coordinated Universal Time, so New York in winter is UTC minus five and Madrid is UTC plus one, a six-hour gap; the calculator adds that gap to your time and handles the wrap-around when the result passes midnight. This avoids the common mistakes of counting hours in the wrong direction or forgetting that the date can change. It is ideal for setting up meetings that work for participants in different countries, planning calls with overseas family, and figuring out when a live event airs in your zone. Note that offsets can shift with daylight saving time, so use the offset that applies on the specific date, and enter half-hour offsets like 5.5 for zones such as India. Enter the two offsets and the time to convert.
converted = time + (to offset − from offset), wrapping across midnight
The difference between two time zones is the destination's UTC offset minus the source's offset. Adding that difference to the original clock time gives the destination time. When the sum passes midnight or goes below zero, the calculator wraps it into the 0-to-24-hour range and reports whether the date shifts forward or back a day, so a time late in one zone can land on the next or previous calendar day in another.
Source:UTC offset time conversion
We review all our tools from time to time to ensure accuracy.
Worked example
How to use this calculator
- 1
Enter your values
Enter from utc offset, to utc offset and time (hh:mm).
- 2
Adjust the options
Fine-tune any options to match your situation.
- 3
Read your result
Converted time updates instantly as you type — no button to press.
Frequently asked questions
How do I find the time in another time zone?
Subtract the source zone's UTC offset from the destination zone's offset to get the hour difference, then add that difference to the original time. The calculator does this for you: enter both offsets and the time, and it returns the converted time and tells you if the date changes. Working through UTC offsets avoids errors from counting in the wrong direction.
What is a UTC offset?
A UTC offset is how many hours a time zone is ahead of or behind Coordinated Universal Time, the global reference. New York is typically UTC minus five, London is UTC plus zero, and Tokyo is UTC plus nine. Positive offsets are east of the prime meridian and ahead in time, while negative offsets are west and behind. Enter each zone's offset to convert between them.
How does the calculator handle crossing midnight?
When adding the time difference pushes the result past midnight or below zero, the calculator wraps the time back into the 24-hour range and reports a day change of plus or minus one day. For example, a late evening time in a western zone can convert to the early morning of the next day in a far-eastern zone. The day-change note prevents scheduling mix-ups.
Does it account for daylight saving time?
Not automatically. Daylight saving time shifts a zone's offset by an hour during part of the year, so you must enter the offset that applies on the date in question. For instance, New York is UTC minus five in winter but UTC minus four in summer. Check each location's current offset for the specific date before converting to get an accurate result.
Can I use half-hour time zones?
Yes. Some regions use offsets that are not whole hours, such as India at UTC plus 5.5 or Newfoundland at UTC minus 3.5. Enter these as decimal values like 5.5 or minus 3.5, and the calculator will apply the correct fractional difference. This ensures accurate conversions for the many places around the world that use thirty- or forty-five-minute offsets.