# Time Zone Converter

URL: https://speedycalculator.com/calculators/conversion/time-zones-converter/
Last updated: 2026-10-25

> The time zone converter shows what time it is in another city for any date and time, including daylight saving time, and gives the time difference and UTC offsets. It uses the time-zone database built into your browser. Everything is calculated in your browser; nothing you type is sent to our server.

## Inputs

- Date and time
- From time zone
- To time zone

## Results

- Converted time
- Same moment in UTC
- Time difference
- UTC offsets

## Formula

```
local time B = local time A − offset A + offset B
```

## Explanation

Scheduling a call across continents is tricky because offsets change with daylight saving time on different dates in different countries. This converter uses the IANA time-zone database (the same one phones and computers use) so it gets those rules right.

### How to use the Time Zone Converter

- **Date and time**
- **From time zone**
- **To time zone**

Everything runs in your browser, so results appear instantly and nothing you type is sent to a server.

### How it works

Your date and time are interpreted in the “from” zone, converted to a single instant in UTC, then displayed in the “to” zone.

## Worked example

Inputs — Date and time: 2026-07-01T09:00; From time zone: Karachi (PKT); To time zone: New York (ET).

Results — **Converted time = Wed, 1 Jul 2026, 00:00**; Same moment in UTC = Wed, 1 Jul 2026, 04:00 UTC; Time difference = −9 h; UTC offsets = UTC+05:00 → UTC−04:00.

## FAQ

**Does it handle daylight saving time?**
Yes, using the official rules for each zone and date.

**What is UTC?**
Coordinated Universal Time, the reference for all time zones.

**Why is India UTC+5:30?**
Some zones use half- or quarter-hour offsets; Nepal is UTC+5:45.

**What formula does the Time Zone Converter use?**
local time B = local time A − offset A + offset B.


## Sources

- [IANA Time Zone Database](https://www.iana.org/time-zones)