Timezone Converter — Convert Time Between World Timezones Free
Convert any time between world timezones instantly. Compare multiple timezones simultaneously with business hours indicators, find the best overlap for team meetings, and share a timezone link with your team. Automatically detects your local timezone and handles daylight saving time.
100% client-side. Uses the browser's built-in Intl API — no server requests, works offline.
How to Convert Between Timezones
- 01
Set your source time and timezone
Enter the date and time you want to convert. Your local timezone is auto-detected. Toggle "Live" to keep it updating in real-time.
- 02
View all timezones simultaneously
8 popular timezones are pre-loaded. Each row shows the local time, date, UTC offset, abbreviation, and business hours status.
- 03
Find the best meeting time
Switch to Meeting Planner mode and drag the hour slider to find windows where all zones overlap during business hours.
Frequently Asked Questions
How does the timezone converter handle daylight saving time?
The converter uses the browser's built-in Intl.DateTimeFormat API, which automatically accounts for daylight saving time (DST) for every timezone. For example, New York is UTC-5 in winter (EST) and UTC-4 in summer (EDT). The correct offset is applied based on the specific date you select.
Why does the converter show "+1 day" or "-1 day"?
When converting across the International Date Line, the calendar date can differ. For example, if it's 11 PM on Monday in New York, it's already Tuesday in Tokyo. The day difference badge shows whether the converted time falls on the same calendar day, the next day (+1), or the previous day (-1) relative to your source timezone.
What does the business hours indicator mean?
The colored dot next to each timezone shows local working status: green (9am–6pm) means it's standard business hours, yellow (6pm–10pm) means evening, and red (10pm–9am) means night. This helps you quickly see whether it's appropriate to schedule a call or send a message.
How does the meeting planner find the best meeting time?
The meeting planner checks every hour of the day and finds hours where all selected timezones simultaneously fall within 9am–6pm business hours. If no overlap exists (e.g., mixing US West Coast with Asia), it suggests the closest workable window or recommends removing some timezones.
How do I share a specific time with my team across timezones?
Click the "Copy Share Link" button to copy a URL that encodes the selected date/time, source timezone, and all displayed timezones. Anyone opening that link will see the same time displayed in all the same zones — useful for scheduling emails, Slack messages, or meeting invites.