UTC (Coordinated Universal Time) is the global time standard. It doesn't observe daylight saving time. All time zones are defined as offsets from UTC, such as EST = UTC-5.

Does this handle daylight saving time?

Yes. The converter uses the Intl.DateTimeFormat API, which automatically accounts for daylight saving time rules in each timezone.

How many time zones exist?

There are 38 distinct UTC offsets in use (some at 30 or 45 minute intervals), but over 400 named timezone identifiers due to different DST rules and historical changes.

Timezone Converter — Convert Time Between Zones

Major City Time Offsets (Standard Time)

City	Timezone	UTC Offset
New York	America/New_York	UTC−5 (EST) / UTC−4 (EDT)
London	Europe/London	UTC+0 (GMT) / UTC+1 (BST)
Tokyo	Asia/Tokyo	UTC+9 (no DST)
Sydney	Australia/Sydney	UTC+10 / UTC+11 (AEDT)
Dubai	Asia/Dubai	UTC+4 (no DST)
Taipei	Asia/Taipei	UTC+8 (no DST)
Los Angeles	America/Los_Angeles	UTC−8 (PST) / UTC−7 (PDT)
Mumbai	Asia/Kolkata	UTC+5:30 (no DST)

Half-Hour and Quarter-Hour Zones

Not all time zones are whole-hour offsets. India uses UTC+5:30 (the entire country). Nepal is UTC+5:45 — the only major 45-minute offset. Newfoundland, Canada uses UTC−3:30. The Chatham Islands (New Zealand) use UTC+12:45. These exist for practical, historical, or political reasons rather than strict solar alignment.

Scheduling Across Time Zones

For international meetings, pick a window where all participants are in normal waking hours (8 AM–8 PM). With a 12+ hour spread (e.g., San Francisco to Tokyo), there's no overlap in standard business hours. Common workarounds: alternate early/late calls weekly, or record meetings for async viewing.

How to Use This Timezone Converter

Select your source timezone and the target timezone, then enter a date and time. The calculator converts and shows the time difference, accounting for Daylight Saving Time.

Formula & How It Works

Target Time = Source Time + (Target UTC Offset – Source UTC Offset). DST transitions shift clocks forward/backward by 1 hour, typically in March and November (Northern Hemisphere).

Calculation Example

New York (EST, UTC-5) to Tokyo (JST, UTC+9): difference is +14 hours. 3:00 PM in New York = 5:00 AM next day in Tokyo.

Expert Tips

Use UTC as the reference when scheduling across multiple timezones. Be careful around DST transitions (spring forward/fall back). Store timestamps in UTC in databases and convert on display.

Timezone Converter

Major City Time Offsets (Standard Time)

Half-Hour and Quarter-Hour Zones

Scheduling Across Time Zones

FAQ

Date Calculator

Countdown Timer

Time Card Calculator

How to Use This Timezone Converter

Formula & How It Works

Calculation Example

Expert Tips