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Hazuu Tools

Timezone Converter

Convert time between different timezones worldwide. Free online timezone converter with major world timezones.

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Select a date/time and timezones, then click Convert to see the result.
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About Timezone Converter

Timezone Converter translates any date and time from one world timezone to another, returning the result in three formats simultaneously: 12-hour (e.g. 9:00 AM), 24-hour (09:00:00), and ISO 8601 with the correct UTC offset appended. It covers over 40 named IANA timezones across every continent, from America/New_York and Europe/London to Asia/Kolkata, Australia/Sydney, and Pacific/Auckland. The live offset-difference badge shows at a glance how many hours and minutes separate the two zones, so you never have to do the mental arithmetic yourself.

The most common use is pinning down a specific meeting or deadline: pick the exact date, type the time as it appears in the invitation, choose the source timezone, select your local zone as target, and click Convert. The result card shows the full weekday and date alongside the time, which catches the frequent trap of a late-night UTC slot that rolls into the next calendar day in Asia. Quick preset buttons for UTC, EST, CST, PST, GMT, CET, IST, JST, AEST, and SGT let repeat users convert with two clicks instead of navigating dropdown lists every time.

Every calculation runs entirely inside your browser using the native Intl.DateTimeFormat API — no data leaves your device, no account is required, and there are no usage limits. Daylight saving time is handled automatically: enter a date in March or November and the tool reads the correct DST-adjusted offset for that specific day rather than applying a fixed year-round value, which is the source of most manual timezone errors.

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Key Features

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Three output formats at once

Every conversion returns the 12-hour clock, 24-hour clock, and ISO 8601 string with offset in one result panel — no need to reformat the output for different systems.

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DST-accurate for any date

The converter reads the real IANA rules for the date you enter, so a March or November conversion applies the correct daylight saving offset rather than a fixed year-round value.

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Live offset-difference badge

The header shows the hour-and-minute gap between the two selected zones before you even click Convert, letting you verify the spread at a glance.

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One-click timezone presets

Ten common presets — UTC, EST, CST, PST, GMT, CET, IST, JST, AEST, and SGT — can be applied to either the source or target field without touching a dropdown.

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Instant timezone swap

A single swap button reverses source and target zones, which is useful when you need to confirm the same meeting time in both directions.

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Copy each result individually

Hover over any output row (12-hour, 24-hour, ISO 8601, full date, or offset) to reveal a copy button so you can grab exactly the format your calendar or API expects.

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How to Use

01

Set the Date and Time

Enter the date and time you want to convert using the date-time picker, or click "Use Current Time" to populate it with the current moment.

02

Choose Source and Target Timezones

Select the timezone the time is currently in (source) and the timezone you want to convert to (target). Use the search field to quickly find a timezone, or click a quick preset button like UTC, EST, or JST.

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View Your Results

Click Convert to see the converted time displayed in 12-hour, 24-hour, and ISO 8601 formats. The tool also shows the full date, timezone abbreviation, and the offset difference between the two zones.

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Example

A 9:00 AM New York time on a US summer date converts to 2:00 PM in London (BST, UTC+1). The tool shows the full weekday and date alongside all three time formats and the UTC offset.

Input settings
Date & Time : 2025-07-15  09:00
From        : America / New York  (EDT, UTC-4)
To          : Europe / London     (BST, UTC+1)
Converted result
12-Hour  : 2:00:00 PM
24-Hour  : 14:00:00
ISO 8601 : 2025-07-15T14:00:00+01:00
Full     : Tuesday, July 15, 2025 at 2:00:00 PM BST
Offset   : UTC+1  |  Difference: +5 hours
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Common Use Cases

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    Scheduling cross-timezone video calls

    Paste the meeting time from a calendar invite, set the organiser's city as the source, choose your local timezone as the target, and read the exact local slot — including whether it crosses midnight into the next day.

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    Setting accurate deadlines in project management tools

    Many project tools store due dates in UTC. Enter your local deadline, convert to UTC, and copy the ISO 8601 string directly into the task without risk of an off-by-one-hour error on a DST boundary.

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    Coordinating product launch times across regions

    Enter the planned launch moment in your headquarters timezone, check the result against each major market's local time, and confirm the timing works for all regions before publishing announcements.

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    Reading server logs and API timestamps

    Server logs often use UTC or a fixed offset. Convert the logged timestamp to your local timezone to match it against user-reported events without needing to calculate the offset manually.

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    Planning international travel arrivals and connections

    Flight departure and arrival times are quoted in local time at each airport. Use the converter to check what the arrival time means in your home timezone so you can plan pickups and onward connections accurately.

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Frequently Asked Questions

What is a Timezone Converter? expand_more
A Timezone Converter is a tool that translates a specific date and time from one timezone to another. It accounts for the UTC offset of each timezone and adjusts the time accordingly, making it easy to coordinate across different regions of the world.
Does it handle Daylight Saving Time (DST)? expand_more
Yes. The converter uses the browser's Intl.DateTimeFormat API, which automatically handles daylight saving time transitions. The converted time will reflect the correct offset for the specific date you enter, whether it falls during standard time or daylight saving time.
Is my data processed securely? expand_more
Absolutely. All conversions happen entirely in your browser using native JavaScript APIs. No data is sent to any server, so your date, time, and timezone selections remain completely private.
How many timezones are supported? expand_more
The tool includes over 40 major world timezones covering all continents, including popular zones like America/New_York (EST), Europe/London (GMT), Asia/Tokyo (JST), Australia/Sydney (AEST), and many more. Quick preset buttons provide one-click access to the most commonly used timezones.
What output formats does the converter return? expand_more
Each conversion returns four pieces of information: the time in 12-hour format (e.g. 2:00:00 PM), 24-hour format (14:00:00), ISO 8601 with the UTC offset appended (2025-07-15T14:00:00+01:00), and a full human-readable string with the weekday, month, and timezone abbreviation. You can copy any individual format with a single click.
Why does the result sometimes show a different calendar date? expand_more
When the source time is late at night or in the early hours, adding or subtracting the offset can push the result past midnight into the next day, or back into the previous day. The full-date row in the result panel shows the weekday and date explicitly so you can catch this before booking travel or setting deadlines.
How is this different from a World Clock or time zone map? expand_more
A world clock shows the current time in multiple cities simultaneously. This Timezone Converter is designed for a different job: you have a specific future (or past) date and time in one zone and need to know the exact equivalent in another zone. It also returns the result in ISO 8601 format, which world clocks do not provide.
How is this different from the Temperature Converter or Number Sorter on this site? expand_more
Temperature Converter and Number Sorter handle numeric unit and list operations. Timezone Converter is the only tool on the site that works with date-and-time values across IANA geographic zones, accounts for daylight saving time automatically, and outputs calendar-aware results including weekday names and ISO 8601 timestamps.
Can I convert a time that is in the past? expand_more
Yes. The date-time picker accepts any date you type, past or future. This is useful for cross-referencing historical log entries or checking what a past event time was in your local timezone.
What does the offset difference badge show? expand_more
The badge in the toolbar displays the hour-and-minute gap between the currently selected source and target timezones based on the present moment. It updates instantly when you change either timezone selector, giving you a quick sanity check before you run the full conversion.