If a call starts at noon in Los Angeles, what time is it in Mumbai? Time zones, plus daylight saving shifts, make this hard to do in your head. The Time Zone Converter takes a date and clock time in one zone. It shows the same moment in another zone.
It is useful for remote teams, travelers, and anyone booking calls across regions. You pick two of 12 common zones from the menus, and the answer updates as you type.
Table of Contents
- What the Converter Does
- How to Use It, Step by Step
- How Time Zone Conversion Works
- Worked Examples
- How to Read the Results
- Daylight Saving and Meeting Tips
- Limitations and Assumptions
- FAQs About the Time Zone Converter
What the Converter Does
The tool converts one date and time between two zones from a fixed list. The list uses standard IANA zone names, so daylight saving rules are applied for you.
- Zones offered: UTC, New York, Chicago, Denver, Los Angeles, London, Paris, Dubai, Kolkata, Singapore, Tokyo, and Sydney.
- Result: the weekday, date, and time in the target zone, in 12-hour format, with its UTC offset.
- Source line: your entered moment, shown with its offset and place for checking.
- Difference line: both offsets and how many hours apart the two zones are on that date.
How to Use It, Step by Step
- Pick a Date (in the From time zone). The form opens on your local date.
- Set the Time (in the From time zone). The sample value is 12:00.
- Choose a From Time Zone. The sample is Los Angeles (PST/PDT).
- Choose a To Time Zone. The sample is India (IST).
- Read the large time under Converted Time. It updates after each change.
The Convert Time Zone button also works if you like to press it. Dates must fall between 1970 and 2100.
How Time Zone Conversion Works
Every wall clock time maps to one moment in universal time. The tool reads your time in the From zone and finds that moment. It then writes the same moment as a wall clock time in the To zone.
Local Time in From Zone-From Offset on That Date=UTC+To Offset on That Date
- Offsets change with the date. Los Angeles is UTC-7 in summer and UTC-8 in winter.
- Kolkata stays at UTC+5:30 all year. Dubai stays at UTC+4. Tokyo stays at UTC+9.
- The browser's built-in time zone data supplies each offset, not a fixed table in the tool.
- Your device time zone plays no part. The same entry gives the same answer on any device.
Worked Examples
Dana books a call for Wednesday, July 15, 2026 at 12:00 PM Los Angeles time. Los Angeles is on daylight time, so it is UTC-7 and the moment is 19:00 UTC.
| To Zone | Offset on July 15, 2026 | Converted Time |
|---|
| New York | UTC-4 | Wed, Jul 15, 2026, 3:00 PM |
| London | UTC+1 | Wed, Jul 15, 2026, 8:00 PM |
| Kolkata | UTC+5:30 | Thu, Jul 16, 2026, 12:30 AM |
| Tokyo | UTC+9 | Thu, Jul 16, 2026, 4:00 AM |
| Sydney | UTC+10 | Thu, Jul 16, 2026, 5:00 AM |
Move the same call to winter. At 12:00 PM Los Angeles time on January 15, 2026, the offset is UTC-8. The moment is 20:00 UTC, and Kolkata shows Fri, Jan 16, 2026, 1:30 AM.
How to Read the Results
The small line above the result repeats your entry. For the first example it reads: "Wed, Jul 15, 2026, 12:00 PM PDT (UTC-7), Los Angeles, US Pacific".
The large line is the converted time with its offset. US zones and UTC also show a short code such as EDT. The line below it compares the two zones, such as "12 hours 30 minutes ahead of Los Angeles, US Pacific on this date."
Daylight Saving and Meeting Tips
The US and Europe change clocks on different weekends. In 2026, US clocks moved forward on March 8, while UK clocks moved on March 29. For three weeks the New York to London gap is 4 hours instead of 5.
At 9:00 AM in New York on March 16, 2026, London shows 1:00 PM. On March 30, 2026, the same 9:00 AM shows 2:00 PM in London. India, Japan, Dubai, and Singapore have no daylight saving, so only their partner zone moves.
Clock change days get a yellow note. Take 2:30 AM in New York on March 8, 2026. That time does not exist, so the tool reads it as 3:30 AM EDT. On November 1, 2026, 1:30 AM happens twice. The tool uses the first one and states what the second would be.
To look up which zone a place uses, try the time zone finder. The time zone reference and the timezone list viewer cover more zones than this tool offers. For raw timestamps, use the Unix timestamp converter. To time the call itself, see the time duration calculator. More tools sit in the unit and time converters hub.
Limitations and Assumptions
- Only 12 zones are available. There is no zone search and no swap button.
- Cities outside the list need the nearest zone with the same rules.
- Denver follows US Mountain time with daylight saving. Arizona does not, so Denver is not a match there in summer.
- Years before 1970 or after 2100 are rejected with a message naming the date field.
- Short codes appear only when the browser supplies one, so London and Kolkata often show just the offset.
FAQs About the Time Zone Converter
Which time zones does the converter support?
It supports 12 zones in total. Paris stands in for most of central Europe, and its label also names Berlin and Rome.
Does it adjust for daylight saving time?
Yes. It uses IANA zone data from your browser, so the offset follows the date you enter. Zones without daylight saving stay fixed.
Why does the date change in my result?
Zones east of you are ahead. A noon time in Los Angeles is already past midnight in Kolkata, so the date moves forward.
Is the time I enter read in my own zone?
No. It is read in the From Time Zone you choose. Pick the zone that matches the clock you are reading.
Why does London sometimes differ by 4 hours from New York?
The US and the UK start daylight saving on different dates. Between them, the usual 5 hour gap shrinks to 4 for a few weeks.
Can I convert a Unix timestamp here?
No. This tool takes a date and a clock time. Use a timestamp converter for epoch values.
This calculator gives general estimates only and is not professional advice. Reviewed for general accuracy by Prof. Dr. Khalil Mudassar, PhD.