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Time Zone Converter

Convert times between world time zones instantly. Supports UTC, US, European, Asian, and Australian time zones with accurate offset calculations.

Source Time

Target Timezone

Converted Time
07:00
UTC (UTC+0) → US/Eastern (UTC-5)

Conversion Details

Source Time12:00 (UTC (UTC+0))
Converted Time07:00 (US/Eastern (UTC-5))
Time Difference-5h
Source UTC OffsetUTC+0
Target UTC OffsetUTC-5
Day ChangeSame day

How to Use This Tool

  1. Select the Source Timezone your time is currently in.
  2. Enter the Hours (0-23) and Minutes (0-59) of the source time.
  3. Select the Target Timezone you want to convert to.
  4. View the converted time instantly in the result box.
  5. Check the Conversion Details card for the UTC offsets of both zones, the time difference between them, and whether the converted time falls on a different day.

Formula & How It Works

Time Zone Conversion Formula

targetTime = sourceTime − sourceOffset + targetOffset

The source time is first converted to UTC by subtracting the source timezone's UTC offset, then converted to the target timezone by adding the target timezone's UTC offset. Offsets are measured in hours relative to UTC, including half-hour offsets like India's UTC+5:30.

Day Change Handling

if resultMinutes < 0: add 1440 and day −= 1; if resultMinutes ≥ 1440: subtract 1440 and day += 1

Since a day has 1440 minutes, if the converted time falls before midnight or after 23:59, the tool wraps the time around and flags whether the result lands on the previous day, the same day, or the next day.

Practical Examples & Common Use Cases

Converting UTC noon to US/Pacific

Source: 12:00 UTC (offset +0). Target: US/Pacific (offset −8). targetTime = 12:00 − 0 + (−8) = 04:00, same day.

Converting a meeting time from US/Eastern to Asia/Tokyo

Source: 21:00 US/Eastern (offset −5). Target: Asia/Tokyo (offset +9). Difference = 9 − (−5) = 14 hours. 21:00 + 14h = 35:00 → wraps to 11:00 the next day.

Converting to a half-hour offset zone

Source: 08:00 UTC (offset +0). Target: Asia/Kolkata (offset +5:30). targetTime = 08:00 + 5h30m = 13:30, same day.

Frequently Asked Questions

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. It serves as a global reference point because it does not observe daylight saving time, making it a stable baseline for converting between any two time zones. All other time zones are defined as offsets from UTC.

This converter uses standard UTC offsets and does not automatically adjust for DST transitions. During DST periods, affected time zones shift by one hour (e.g., US/Eastern becomes UTC-4 instead of UTC-5). For critical time conversions during DST periods, verify the current offset for your specific timezone.

Some countries and regions adopted half-hour (or even 45-minute) offsets from UTC to better align their clocks with solar noon. India (UTC+5:30), Nepal (UTC+5:45), and parts of Australia use non-whole-hour offsets. These offsets were typically chosen for geographic, political, or historical reasons.

When a conversion crosses midnight, the day changes. For example, converting 23:00 UTC to Asia/Tokyo (UTC+9) results in 08:00 the next day. This converter shows a "Day Change" indicator telling you whether the result falls on the same day, the next day, or the previous day relative to the source date.

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