Time Zone Converter
Convert times between different time zones around the world.
How the Timezone Converter Works
A timezone converter takes a time in one location and translates it into the local clock time of another location. Behind every conversion is a single reference: Coordinated Universal Time (UTC). Every time zone on Earth is defined as an offset from UTC, written as a plus or minus number of hours and minutes.
To convert a time, the tool follows three simple steps:
- Convert the source time to UTC by subtracting that zone's offset.
- Apply the destination offset by adding it to the UTC value.
- Adjust the date if the result crosses midnight forward or backward.
For example, if it is 3:00 PM in New York (UTC-4 during summer) and you want London time (UTC+1 during summer), the math is: 3:00 PM minus (-4) gives 7:00 PM UTC, then plus (+1) gives 8:00 PM in London. The five-hour gap you experience is simply the difference between the two offsets.
Understanding UTC and Time Zone Offsets
UTC is the modern successor to Greenwich Mean Time (GMT) and serves as the global time standard. It never changes for daylight saving and is the anchor that makes conversions reliable. A time zone's offset tells you how far its standard clock sits from UTC.
Here are common offsets to give you a feel for the scale:
| City / Zone | Standard Offset | Summer (DST) Offset |
|---|---|---|
| Los Angeles (PT) | UTC-8 | UTC-7 |
| New York (ET) | UTC-5 | UTC-4 |
| London (UK) | UTC+0 | UTC+1 |
| Berlin / Paris (CET) | UTC+1 | UTC+2 |
| India (IST) | UTC+5:30 | No DST |
| Tokyo (JST) | UTC+9 | No DST |
| Sydney (AET) | UTC+10 | UTC+11 |
Notice that some offsets are not whole hours. India uses UTC+5:30, and a few zones such as Nepal use UTC+5:45. This is why subtracting raw hours by hand can produce errors, and an automated converter is more reliable.
Daylight Saving Time and Common Pitfalls
Daylight Saving Time (DST) is the seasonal practice of moving clocks forward by one hour in spring and back in autumn to make better use of evening daylight. It is the single biggest source of confusion in time conversions because it changes a region's offset for part of the year.
Important caveats to remember:
- Not every region observes DST. Most of Asia, Africa, and parts of Australia keep a fixed offset year-round.
- Hemispheres are opposite. When North America springs forward in March, Australia is winding down its summer time.
- Switch dates differ. The US and Europe do not change clocks on the same weekend, creating short windows each year where the usual gap between two cities is off by an hour.
For instance, New York and London are normally five hours apart, but for roughly two weeks in late March that gap shrinks to four hours because the US switches before the UK. A good converter accounts for these dates automatically, so you should always confirm the exact calendar date you are converting, not just the time.
Whether you are scheduling an international meeting, catching a live broadcast, or coordinating a flight arrival, anchoring everything to UTC and letting the tool apply the correct offsets is the safest approach.
Frequently Asked Questions
UTC (Coordinated Universal Time) is the global time standard that never shifts for daylight saving. Every time zone is defined as an offset from UTC, so converting between two zones is really just comparing their offsets from this common reference point.
Convert the source time to UTC by removing its offset, then add the destination zone's offset. For example, 9:00 AM in New York (UTC-5) is 2:00 PM UTC, which is 3:00 PM in Berlin (UTC+1). The converter does this automatically for any date.
Yes. Because DST changes a region's offset for part of the year, the converter checks the specific date you enter and applies the correct standard or summer offset, so your result reflects the real local clock time.
Countries start and end daylight saving on different dates. The US and Europe, for example, do not switch on the same weekend, creating short periods each spring and autumn where the usual gap between cities is one hour larger or smaller than normal.
It means the local time is 5 hours and 30 minutes ahead of UTC. India uses UTC+5:30 and Nepal uses UTC+5:45. These half- and quarter-hour offsets are why manual conversions are easy to get wrong.
No. Many regions, including most of Asia and Africa, keep a fixed offset all year. Among those that do observe DST, the Northern and Southern Hemispheres shift in opposite seasons, so always check whether each location uses it.