Convert any date and time between multiple time zones instantly. Perfect for scheduling global meetings.
New York (ET)
01:13:24 AM
Sun, Apr 19
UTC-04:00
London (GMT/BST)
06:13:24 AM
Sun, Apr 19
UTC+01:00
Delhi / Mumbai (IST)
10:43:24 AM
Sun, Apr 19
UTC+05:30
Tokyo (JST)
02:13:24 PM
Sun, Apr 19
UTC+09:00
The world is divided into 24 primary time zones, each representing one hour of difference from UTC (Coordinated Universal Time). However, in practice there are over 40 distinct offsets, including half-hour offsets (India at UTC+5:30, Iran at UTC+3:30) and even quarter-hour offsets (Nepal at UTC+5:45). Daylight Saving Time (DST) adds another layer of complexity — the United States, European Union, and many other regions shift their clocks forward by one hour in spring and back in autumn, meaning the offset between two cities can change twice per year.
When scheduling across time zones, the golden rule is to always communicate in the recipient's local time. Saying "let's meet at 3pm ET" is clear for someone in New York but requires mental calculation for everyone else. Instead, use a time zone converter to find a time that works for all participants, then share the meeting invite with each person's local time clearly stated.
The overlap window between major business hubs is narrow. New York and London share about 5 hours of business overlap (9am–2pm ET / 2pm–7pm GMT). London and Singapore share about 2 hours (8am–10am GMT / 4pm–6pm SGT). New York and Singapore have almost no overlap during standard business hours. For truly global teams, rotating meeting times is the fairest approach — no single region should always bear the burden of early-morning or late-night calls.
| City Pair | Overlap Window | Hours of Overlap |
|---|---|---|
| New York ↔ London | 9am–2pm ET / 2pm–7pm GMT | 5 hours |
| New York ↔ Berlin | 9am–12pm ET / 3pm–6pm CET | 3 hours |
| London ↔ Dubai | 9am–5pm GMT / 1pm–9pm GST | 4 hours |
| London ↔ Singapore | 8am–10am GMT / 4pm–6pm SGT | 2 hours |
| New York ↔ Singapore | 8pm–10pm ET / 8am–10am SGT | 2 hours (evening) |
| New York ↔ Tokyo | 8pm–10pm ET / 9am–11am JST | 2 hours (evening) |
The Time Zone Converter is a free online tool that instantly converts times between any two time zones in the world. Whether you are scheduling international meetings, coordinating with remote teams across continents, or planning travel across time zones, this converter eliminates the confusion of Daylight Saving Time changes and UTC offsets. With 201,000 monthly searches, time zone conversion is one of the most common needs for global professionals and remote workers.
Select your source time zone from the dropdown — this is your current location or the time zone you are converting from.
Enter the date and time you want to convert.
Select the target time zone — the location you are converting to.
The converter instantly displays the equivalent time in the target zone, accounting for Daylight Saving Time.
Use the multi-zone view to see the same time across multiple time zones simultaneously.
Share the converted time link with colleagues to avoid confusion in meeting invitations.
Time zones are regions of the Earth that observe a uniform standard time. The world is divided into 24 standard time zones, each roughly 15 degrees of longitude wide, corresponding to one hour of time difference. However, the actual time zone boundaries are irregular — they follow country and regional borders for practical and political reasons, resulting in 38+ distinct UTC offsets globally.
UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is essentially the same as GMT (Greenwich Mean Time) but is more precisely defined. All other time zones are expressed as offsets from UTC: UTC+1 (Central European Time), UTC-5 (Eastern Standard Time), UTC+8 (China Standard Time), etc.
Daylight Saving Time (DST) adds complexity by shifting clocks forward by one hour during summer months in approximately 70 countries. The transition dates vary by country, which means the offset between two time zones can change twice per year. This converter automatically accounts for DST transitions.
Scheduling international meetings is one of the most common challenges for remote and global teams. The key is finding a time that falls within reasonable working hours for all participants — typically 9am–6pm in each location.
For teams spanning the Americas and Europe, the overlap window is typically 2–4 hours in the early afternoon Eastern Time (late afternoon in Europe). For teams spanning Europe and Asia-Pacific, the overlap is minimal — early morning in Europe corresponds to late afternoon in Asia. For truly global teams spanning all time zones, rotating meeting times is the fairest approach, so no single region always bears the inconvenience of early morning or late evening calls.
Best practices for international meeting scheduling: (1) Always specify the time zone explicitly in invitations (e.g., '3pm ET / 8pm GMT / 9pm CET'). (2) Use calendar tools that automatically convert to each participant's local time. (3) Send a follow-up message confirming the time in each participant's local zone. (4) For recurring meetings, consider rotating the time to share the inconvenience equitably.
Never write '3pm' without specifying the time zone. Always include the zone abbreviation and UTC offset: '3pm ET (UTC-5)' or '3pm GMT'. This eliminates ambiguity and prevents missed meetings.
DST transition dates vary by country and can shift the offset between two time zones by one hour. Always use a converter that automatically accounts for DST rather than manually calculating offsets.
For technical systems (APIs, databases, scheduled jobs), always store and communicate times in UTC. Convert to local time only for display purposes. This eliminates DST-related bugs and ambiguity.
For recurring international meetings, rotate the time so no single team always has the early morning or late evening slot. This distributes the inconvenience fairly and improves team morale.
If you regularly work with teams in specific locations, memorise their UTC offsets. Knowing that your London colleague is UTC+0 (or UTC+1 in summer) and your New York colleague is UTC-5 (or UTC-4 in summer) eliminates the need to look it up every time.
Most smartphones allow you to add multiple world clocks to the clock app. Add clocks for every location you regularly communicate with so you can check the time at a glance without converting.