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Time Zone Calculator

Convert time between major world time zones instantly.

Last updated: June 13, 2026

Calculator

Hour (0-23)

From UTC Offset

To UTC Offset

Results

Converted Time5:00 PM

Time Difference+5 hours

24h Format17:00

How to Use This Calculator

1Enter the hour in 24-hour format (0-23).
2Select your source time zone (UTC offset).
3Select the destination time zone.
4View converted time with day-shift indication.

Formula Explanation

Time zone conversion adds the UTC offset difference to the original time.

New Time = Original Hour + (Destination Offset - Source Offset)

Variables:

HourTime in 24-hour format

OffsetsUTC offsets for source and destination zones

Worked Examples

12:00 PM Eastern (UTC-5) to London (UTC+0)

1. Difference = 0 - (-5) = +5 hours
2. 12 + 5 = 17:00 (5:00 PM)

Result: 5:00 PM in London

Why Use This Calculator

Schedule meetings across time zones.
Plan international calls.
Coordinate with global teams.
Convert quickly without mental math.

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Tips & Best Practices

India (IST) is UTC+5:30 — one of the few half-hour offsets.
Some regions observe daylight saving time, shifting their UTC offset by 1 hour.
When it's noon in New York, it's 5 PM in London and 1 AM the next day in Tokyo.

Common Mistakes to Avoid

❌ Forgetting daylight saving time shifts.

✅ DST typically shifts clocks by 1 hour. Check if either location currently observes DST for accurate conversion.

❌ Confusing AM/PM with 24-hour time.

✅ Add 12 to PM hours (1 PM = 13:00). Subtract 12 from hours >12 for AM/PM format.

Frequently Asked Questions

What is UTC?

UTC (Coordinated Universal Time) is the global time standard. All time zones are expressed as offsets from UTC (e.g., US Eastern is UTC-5).

How many time zones are there?

There are 24 standard time zones plus several half-hour and 45-minute offsets (like India at UTC+5:30 and Nepal at UTC+5:45), totaling about 38 unique zones.

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Embed This Calculator

Add the Time Zone Calculator to your website for free. Copy the code below and paste it into your HTML.

Width

Height

<iframe src="https://redicalc.com/embed/travel/time-zone-calculator" width="100%" height="600" style="border:none;border-radius:12px;box-shadow:0 1px 3px rgba(0,0,0,0.1);" title="Time Zone Calculator — RediCalc.com" loading="lazy" allowtransparency="true"></iframe>

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Disclaimer: This calculator is provided for informational and educational purposes only. Results are estimates and should not be used as a substitute for professional advice. RediCalc.com makes no guarantees regarding the accuracy, completeness, or suitability of any calculations. Always consult a qualified professional before making financial, health, construction, or other important decisions.

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