Time Zone Converter

About this tool

This time-zone converter turns a date and time in one selected IANA zone into formatted times for UTC, Kathmandu, Kolkata, London, Berlin, New York, Los Angeles, Tokyo, and Sydney. It uses the browser's internationalization time-zone data, so daylight-saving offsets are applied for the selected date instead of assuming one fixed offset. Non-whole-hour offsets such as Kathmandu (+05:45) and Kolkata (+05:30) are included. The tool displays converted times but does not detect every ambiguous or nonexistent local clock time during a daylight-saving transition; verify unusual transition cases with the source zone's official rules.

Why use it

• Nine Zones at Once: One entry shows the same moment in UTC, Kathmandu, Kolkata, London, Berlin, New York, Los Angeles, Tokyo and Sydney, covering the main hubs for distributed teams.

• Automatic DST Handling: Daylight-saving offsets come from your browser's time-zone data for the date you enter, so a January date in New York uses winter time and a July date uses summer time with no manual adjustment.

• Half- and Quarter-hour Offsets: Kolkata (+05:30) and Kathmandu (+05:45) are included and converted exactly, rather than rounded to the nearest hour.

• Meeting Planning: Enter a proposed meeting time and see what it corresponds to across all nine zones, including whether it falls on the next or previous calendar day.

• Complete Privacy: Conversions run on your device using the browser's built-in time-zone data. No times or schedules are sent to any server.

How to use

1. Pick the date of the moment you want to convert — it defaults to today
2. Enter the time in the Time field — it starts at 12:00
3. Choose the source zone in the From zone dropdown, such as America/New_York
4. Read the same moment as a date and time in all nine listed zones
5. Check the date on each row, since far-east zones may already be on the next day

When it helps

• When scheduling a video call with international colleagues and you need to find a time that falls within business hours across several continents
• 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 change near a meeting date shifts the gap between two cities
• When you need the UTC equivalent of a local time for a log, server job or API timestamp

Examples

Tips

• Always write the time zone name when sending a meeting invite so recipients can check the conversion themselves
• 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
• Kolkata (+5:30) and Kathmandu (+5:45) are not whole-hour offsets — check the minutes, not just the 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
• Check the date shown for Tokyo and Sydney — an evening meeting in the Americas is often the next morning there

Frequently Asked Questions

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.