Timezone Converter - Convert Time Between Time Zones

How to use this tool

1. Enter the date and time. Type or pick the date and time you want to convert in the "Date & time" field.
2. Select the source timezone. Your local timezone is pre-selected. Search or type to change it to any IANA timezone.
3. Add target timezones. Search for and select timezones in the "Add target timezone" field, or click the quick-add buttons.
4. Read the results. Each card shows a friendly zone label, abbreviation, converted date and time, UTC offset, relative difference from the source, and whether DST is active. The sun or moon uses a fixed local-hour rule, not sunrise.

How to convert time zones

Select the date and time you want to convert, choose your source timezone, and then add any number of target timezones. The results update instantly, with no button to click.

Your browser's timezone is detected automatically as the default source. You can search through the full IANA timezone database (600+ entries) by typing in the dropdown.

Use Now to set the selected source zone to the current time. The cards show each zone's short abbreviation and its clock difference from the source, including half-hour offsets. Copy times for a plain-text summary, or copy a link to reopen the same date, source, and target zones. The link adds those settings after the # fragment only when you click Copy link. Only share it with people who should see the selected date and time.

Reading the day and night icons

The sun and moon are quick visual cues based only on the local clock: 06:00 through 19:59 is labeled daytime, and other hours are labeled nighttime. This simple rule does not calculate sunrise or sunset, so it may not match actual daylight in a particular place or season.

Understanding UTC offsets

Every timezone is defined by its offset from UTC (Coordinated Universal Time). For example:

• UTC-5: US Eastern Standard Time (EST)
• UTC+0: Greenwich Mean Time (GMT), which equals UTC in winter
• UTC+5:30: India Standard Time (IST), a half-hour offset
• UTC+9: Japan Standard Time (JST)

Daylight Saving Time (DST)

Many countries shift their clocks forward by one hour in spring and back in fall. This temporarily changes the UTC offset. A DST badge appears on any card where the selected date falls in the DST period.

Notable exceptions that never observe DST: Japan, China, India, most of Africa, and UTC itself.

Common time zone conversions

IANA timezone database

This tool uses the browser's native Intl.DateTimeFormat API, which is backed by the IANA timezone database. This database is the global standard used by operating systems and programming languages worldwide. It contains rules for every historical and future DST transition, ensuring accurate conversions even for past or future dates.

Business meeting scheduling tips

Scheduling across time zones is one of the most common use cases for this tool. Some useful reference points:

• US Eastern ↔ UK: US ET is UTC−5 (winter) or UTC−4 (summer); UK is UTC+0 (winter) or UTC+1 (summer). A 2–5 PM ET slot corresponds to 7–10 PM London time in winter. The time difference narrows by 1 hour when either side observes DST.
• US West Coast ↔ Asia Pacific: 8–10 AM PT (UTC−8) is late evening in Singapore (UTC+8) and Tokyo (UTC+9). Cross-Pacific calls often work better at the start of the US day or end of the Asian working day.
• Finding overlap: there is typically a 1–3 hour overlap window between US East Coast business hours and Western European business hours. For specific dates and working-hour overlap, use the Meeting Planner.

International Date Line

The International Date Line runs approximately along 180° longitude (with diversions to avoid splitting island nations and territories). Crossing it from west to east subtracts one calendar day; crossing from east to west adds one day. This is why flights from the US to Asia can arrive on the same day or even the day before they departed (by clock time).

In 2011, Samoa skipped December 29–30 entirely to move to the west side of the date line, aligning with its main trading partners Australia and New Zealand.

Unix timestamp note

A Unix timestamp counts the number of seconds elapsed since 1 January 1970 00:00:00 UTC (the Unix epoch). It is timezone-independent: the same timestamp represents the same instant of time everywhere. Converting a Unix timestamp to a human-readable date always requires specifying a timezone.

This tool converts between human-readable date/times and timezones. To convert Unix timestamps, see the Unix Timestamp Converter tool.