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Time Zone Converter

Convert date and time between world time zones

About Time Zone Converter

Coordinating across time zones is one of the most friction-heavy parts of remote work, international travel, and global team management. A meeting time that works in New York may be midnight in Tokyo or 5:30 AM in Mumbai. This timezone converter lets you enter any date and time in any city or UTC offset and instantly see the equivalent local time in multiple target cities simultaneously. The tool is daylight saving time aware — it reads the actual DST status for the selected date rather than applying a fixed offset, so a meeting set for March 8 in New York is correctly treated as EST, and one set for April 1 is correctly treated as EDT. Half-hour and quarter-hour offsets used by India (IST +5:30), Iran (IRST +3:30), and Newfoundland (NST −3:30) are fully supported.

Why use Time Zone Converter

Live Multi-city Clocks

Add multiple cities and compare their current times side-by-side. Useful for remote teams in different continents who need a persistent reference rather than a one-off conversion.

Automatic DST Handling

DST transitions are applied based on the actual date entered, not a fixed offset. A date before the spring-forward in the US uses EST; after the transition it uses EDT. No manual adjustment needed.

Meeting Slot Finder

Enter a proposed meeting time and see what it corresponds to in every participant's location simultaneously. Identify a slot that falls within business hours for all parties without spreadsheet gymnastics.

UTC Offset Display

Each result shows the UTC offset in effect — IST +5:30, EST −5:00, CET +1:00 — so participants in any location can verify the conversion independently using any timezone reference.

ISO 8601 Copy Format

One-click copy produces a datetime string with the UTC offset in ISO 8601 format, such as 2026-05-15T10:00:00−08:00. Paste directly into calendar apps, APIs, or scheduling tools for unambiguous timezone-aware timestamps.

Complete Privacy

Your local device time is read on-device. No query times, cities, or meeting schedules are sent to any server or stored in any database.

How to use Time Zone Converter

  1. Select the source city or time zone from the searchable dropdown or type a city name
  2. Enter the date and time you want to convert — use 24-hour format to avoid AM/PM ambiguity
  3. Add one or more target cities using the Add City button
  4. Read the converted time for each target city alongside its UTC offset and DST status
  5. Toggle to the DST visual to see when spring-forward and fall-back transitions occur near your chosen date
  6. Copy the ISO 8601 formatted time with offset for pasting into calendar invitations or meeting schedulers

When to use Time Zone Converter

  • When scheduling a video call with international colleagues and you need to find a time that falls within business hours across three or more continents
  • When booking a flight or train and the departure and arrival times are listed in local time for two different cities
  • When a webinar, product launch, or live event is announced in Pacific Time and you need to know when to set your alarm
  • When a client in a different country sends you a deadline expressed in their local time and you need to know the equivalent in your own time zone
  • When checking whether a DST transition falls near a critical meeting date and you need to confirm the offset does not shift mid-event
  • When writing a meeting invitation and you want to include the correct UTC offset so participants everywhere can verify the time independently

Examples

New York to Mumbai and London

Input: Source: New York (EST), Time: 09:00 AM, Date: 2026-01-15

Output: London (GMT): 14:00 — Mumbai (IST): 19:30

Meeting across four zones

Input: 10:00 PST (UTC-8) on 2026-05-15

Output: New York (EDT UTC-4): 13:00 — London (BST UTC+1): 18:00 — Tokyo (JST UTC+9): 02:00 next day

DST spring-forward edge case

Input: New York, 2026-03-08 02:30 AM

Output: This time does not exist — clocks jump from 02:00 to 03:00 EDT on this date

Tips

  • Always include the UTC offset when sending a meeting invite — most calendar apps convert it correctly, but the written offset lets recipients verify manually if they suspect a DST error
  • Avoid scheduling meetings near 02:00 on the last Sunday in March (EU) or second Sunday in March (US) — these are DST transition hours that can cause a one-hour confusion
  • India (IST +5:30), Iran (IRST +3:30), and Newfoundland (NST −3:30) all use half-hour offsets — make sure your tool accounts for these rather than rounding to the nearest whole hour
  • Use 24-hour time format in written communications to avoid AM/PM ambiguity — 14:00 is unambiguous; 2:00 PM is not in every locale
  • Pin your most-used city combination — your home zone plus your team's main hub — so you always have a live reference visible without re-entering it

Frequently Asked Questions

What is the difference between GMT and UTC?▾
GMT (Greenwich Mean Time) is a time zone based on the mean solar time at the Royal Observatory in Greenwich, UK. UTC (Coordinated Universal Time) is the international atomic-clock-based standard. For most practical purposes they are identical, but UTC is the technically correct reference for modern computing. The UK observes GMT in winter and BST (UTC+1) in summer.
How does Daylight Saving Time affect conversions?▾
DST shifts clocks forward by one hour in spring and back one hour in autumn in countries that observe it. The US, EU, Australia, and others transition on different dates, so there is a brief window each year where the offset between two DST-observing zones changes by an hour. This tool uses date-aware DST rules rather than fixed offsets to handle those transition weeks correctly.
Why does India have a 30-minute offset?▾
India Standard Time is UTC+5:30 — a half-hour offset rather than a whole-hour one. This was chosen historically as a compromise between the time zones of western and eastern India. IST does not observe DST. Several other countries also use non-hour offsets: Iran is UTC+3:30, Nepal is UTC+5:45, and Newfoundland is UTC−3:30.
How do I find the IANA time zone for a city?▾
IANA (Internet Assigned Numbers Authority) time zone identifiers follow the format Region/City, such as America/New_York, Europe/London, or Asia/Kolkata. They are used by operating systems, databases, and programming languages. The city dropdown in this tool maps to IANA identifiers internally, so DST transitions are always correct.
What happens to meetings during the DST transition?▾
If a recurring meeting is scheduled for 10:00 AM in New York and the DST transition moves clocks forward, the meeting still occurs at 10:00 AM local New York time — which is now EDT instead of EST. For participants in zones that do not observe DST (such as India or China), the UTC equivalent shifts by one hour on that day.
How do leap seconds affect time-zone math?▾
Leap seconds are occasionally added to UTC to keep atomic time aligned with Earth's rotation. They are extremely rare — roughly one per 18 months — and have no practical effect on time-zone conversions or meeting scheduling. Most computing systems handle or smear them automatically.
Can two cities in the same country have different time zones?▾
Yes — several large countries span multiple time zones. The US has six, Russia has eleven, and even Australia has multiple zones including a half-hour offset for South Australia (ACST UTC+9:30). China officially uses a single time zone (UTC+8) across its entire territory despite spanning five geographic zones.
Why does my phone show a different time than my laptop?▾
Common causes include: one device has not synced its clock recently, one is set to manual time rather than automatic network time, one is using a different time zone setting, or a DST transition recently occurred and one device has not applied the update. Check that both devices are set to automatic time zone detection and synced to a network time server.

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Glossary

UTC (Coordinated Universal Time)
The primary international time standard against which all time zones are defined as offsets. UTC is maintained by atomic clocks and does not observe daylight saving time. It replaced GMT as the technical standard but the two are practically equivalent for everyday use.
Time Zone Offset
The difference, in hours and minutes, between a location's local time and UTC. For example, IST (India Standard Time) is UTC+5:30, meaning local time is 5 hours and 30 minutes ahead of UTC.
Daylight Saving Time (DST)
A seasonal practice of advancing clocks by one hour in spring to extend evening daylight and returning to standard time in autumn. Not all countries observe DST; transitions occur on different dates in different regions.
IANA Time Zone
A standardised time zone identifier in the format Region/City (e.g., America/New_York, Asia/Tokyo) maintained by the Internet Assigned Numbers Authority. IANA identifiers encode historical and current DST rules for every zone.
ISO 8601
An international standard for representing dates and times as text strings. A timezone-aware ISO 8601 timestamp includes the UTC offset, for example 2026-05-15T14:30:00+05:30. This format is unambiguous and machine-readable.
Solar vs Civil Time
Solar time is based on the sun's position and varies continuously with longitude. Civil time is the standardised legal time adopted by governments within a zone. Civil time zones are typically one-hour-wide bands, though political and practical factors cause some zones to deviate.