World Clock UK 2025

New York is 5 hours behind UK time (4 hours during British Summer Time). When it's 3pm in London, it's 10am in New York. New York uses Eastern Time (ET) - Eastern Daylight Time (EDT, UTC-4) from the second Sunday in March to the first Sunday in November, and Eastern Standard Time (EST, UTC-5) the rest of the year. Wall Street trading hours are 9:30am-4pm ET (2:30pm-9pm UK time). Check the live clock above for the current New York time.

GMT (Greenwich Mean Time) is UTC+0, the UK's winter time from the last Sunday in October to the last Sunday in March. BST (British Summer Time) is UTC+1, used from the last Sunday in March to the last Sunday in October. During BST, UK clocks are 1 hour ahead of GMT. GMT is the world's reference timezone - all other timezones are calculated as offsets from GMT/UTC. When scheduling internationally, always clarify whether you mean "GMT" (fixed UTC+0) or "UK time" (which changes seasonally).

Yes, this world clock automatically adjusts for daylight saving time (DST) in all countries. It uses your device's IANA timezone database which handles all DST transitions correctly. Note that not all countries observe DST - Japan, China, Singapore, Dubai, and India don't change their clocks. During transition periods (late March, late October, early November), time differences between UK and USA temporarily shift because the countries change clocks on different dates.

For USA East Coast (New York, Boston, Miami, Washington DC): Call between 2pm-6pm UK time (9am-1pm Eastern Time). For USA West Coast (Los Angeles, San Francisco, Seattle): Call between 5pm-9pm UK time (9am-1pm Pacific Time). The overlap window where both UK and US East Coast are in normal business hours is 2pm-5pm UK time. For West Coast, the overlap is 5pm-5pm UK time (only if you're willing to work late).

Major stock exchange hours in UK time (GMT): Tokyo Stock Exchange 12:00am-6:00am (with lunch break), Hong Kong 1:30am-8:00am, Singapore 1:00am-9:00am, London Stock Exchange 8:00am-4:30pm, Frankfurt DAX 8:00am-4:30pm, New York NYSE/NASDAQ 2:30pm-9:00pm. This creates a continuous 24-hour trading cycle: Asian markets overnight, European markets during UK day, American markets from afternoon to evening.

India uses a single timezone (IST, UTC+5:30) for the entire country, which results in the unusual half-hour offset. This was chosen in 1947 to be roughly in the middle of India's longitudinal span. Other countries with half-hour offsets include Iran (UTC+3:30), Afghanistan (UTC+4:30), and Nepal (UTC+5:45). Parts of Australia (South Australia, Northern Territory) also use half-hour offsets. Always account for these unusual offsets when scheduling.

Find the overlap window where all participants are in reasonable hours (roughly 8am-8pm local time). For UK-USA meetings, this is typically 2pm-6pm UK time. For UK-USA-Asia meetings, there's almost no comfortable overlap - consider rotating meeting times or recording for async viewing. Use tools like World Time Buddy to visualise overlap. Always specify the timezone in meeting invites (e.g., "3pm UK time" or "3pm BST").

The UK-Australia time difference varies by season and Australian state. Sydney (NSW) is typically 10-11 hours ahead of UK. Perth (WA) is 8 hours ahead with no DST. Crucially, Australia's summer is UK's winter, so when UK uses GMT, Sydney uses AEDT (11 hours ahead), and when UK uses BST, Sydney uses AEST (9 hours ahead). During the transition periods (March-April and October-November), the difference can vary significantly as each country changes clocks on different dates.