Time Zone Calculator

Convert times between world time zones. Shows a world clock for major cities including New York, London, Tokyo, and Sydney.

New York (UTC-5)

11:53 PM

Wed, Apr 15 11:53 PM

London (UTC+0)

4:53 AM

Thu, Apr 16 4:53 AM

Time difference: +5h — next day (+1)
World Clock
CityTimeUTC Offset
New York11:53 PMUTC-5
London4:53 AMUTC+0
Paris5:53 AMUTC+1
Dubai8:53 AMUTC+4
Mumbai10:23 AMUTC+5:30
Singapore12:53 PMUTC+8
Tokyo1:53 PMUTC+9
Sydney2:53 PMUTC+10

How to Use the Time Zone Calculator

  1. Enter the reference date and time. Defaults to the current date and time in your browser.
  2. Select the From timezone. This is the timezone the entered time is in. For example, if you are in New York and it is 3:00 PM, select UTC-05:00 (Eastern Time).
  3. Select the To timezone. This is the timezone you want to convert to.
  4. Read the result. The converted time appears on the right, along with whether it is the same day, next day, or previous day.
  5. World clock. The table below the result shows what time it is simultaneously in 8 major cities around the world.
This calculator uses fixed UTC offsets and does not account for Daylight Saving Time (DST). New York is UTC-5 in winter and UTC-4 in summer. London is UTC+0 in winter and UTC+1 in summer. For precision scheduling, verify DST status for the specific date.

How Time Zone Conversion Works

Every time zone is defined by an offset from Coordinated Universal Time (UTC). To convert between time zones:

UTC time = Local time - UTC offset
Target local time = UTC time + Target UTC offset

Simplified:
Target time = Source time + (Target offset - Source offset)

Example: Convert 3:00 PM New York (UTC-5) to Tokyo (UTC+9):

Difference = UTC+9 - UTC-5 = +14 hours
Tokyo time = 3:00 PM + 14 hours = 5:00 AM (next day)

Major UTC offsets (standard time, no DST):

CityStandard offsetSummer offset (DST)
New YorkUTC-5UTC-4
LondonUTC+0UTC+1
ParisUTC+1UTC+2
DubaiUTC+4No DST
MumbaiUTC+5:30No DST
SingaporeUTC+8No DST
TokyoUTC+9No DST
SydneyUTC+10UTC+11

Frequently Asked Questions

Find the UTC offset for your source timezone and your target timezone. The difference between them is how many hours to add or subtract. For example, New York (UTC-5) to London (UTC+0) is a difference of +5 hours. If it is 10:00 AM in New York, it is 3:00 PM in London. Our calculator handles this automatically.

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