Quick Answer
To convert between time zones, find the UTC offset of each zone and subtract: Target Time = Source Time + (Target UTC offset − Source UTC offset). For example, from UTC+5 (Pakistan) to UTC−5 (US Eastern): subtract 10 hours.
What Is Time Zone Converter?
A timezone converter tells you what time it is in another city right now, or converts a specific time between zones, essential for scheduling international meetings and calls.
Time zones are defined by their offset from UTC (Coordinated Universal Time), ranging from UTC−12 to UTC+14. Many countries observe Daylight Saving Time (DST), shifting clocks by 1 hour in summer, meaning the offset between two locations can change twice a year.
This tool shows the current local time in all major time zones in real time, making it easy to find a window that works across regions, for example, business hours overlapping between Karachi and New York.
How to Use
- 1The converter displays current time across all major time zones in real time.
- 2Use it to find what time it is in any city, or check if a given time in one zone corresponds to a reasonable hour in another.
Formula
Target Time = Source Time + (Target UTC offset − Source UTC offset)If result < 0 hours: subtract 1 day. If result ≥ 24 hours: add 1 day.Example: 3:00 PM in Karachi (UTC+5) → London (UTC+1 BST summer)
- Offset diff = +1 − +5 = −4 hours
- London time = 15:00 − 4 = 11:00
Tips & Things to Know
- DST changes offset by ±1 hour for US, Canada, most of Europe, and Australia. Pakistan, China, Japan do not observe DST.
- US alone has 6 time zones: ET (New York), CT (Chicago), MT (Denver), PT (Los Angeles), AK, HI.
- Pakistan Standard Time (PKT) is UTC+5 and never changes, no DST.
- For scheduling international meetings: look for the 9 AM–5 PM overlap between zones. Pakistan (UTC+5) to UK (UTC+0/+1), a 2–3 PM PKT call lands at 9–10 AM UK time, comfortable for both sides.
- China spans five geographic time zones but uses a single UTC+8 standard, meaning sunrise arrives as late as 10 AM in western Xinjiang. Not all countries choose the geographically 'correct' offset.
- IST (India) is UTC+5:30 and Nepal is UTC+5:45, half and three-quarter hour offsets that exist because the zones were calibrated to place solar noon as close as possible to 12:00 PM at the country's centre.