Daylight saving time
London (United Kingdom) observes daylight saving time from the last Sunday of March to the last Sunday of October: UTC+0 in January, UTC+1 in July. Singapore (Singapore) does not change clocks: UTC+8 all year.
London uses GMT (UTC+0) in winter and British Summer Time (BST, UTC+1) in summer.
Best time for a call
If both sides work 9:00–18:00 local time, the shared window is 09:00–10:00 in London = 17:00–18:00 in Singapore (1 hour) in January and 09:00–11:00 in London = 16:00–18:00 in Singapore (2 hours) in July. Put recurring calls in this window and state the time with the city name (for example “14:00 London time”) to avoid confusion. How to schedule a meeting across time zones.
How to read the chart
The left column is the local time in London, the other columns show the same moment in Singapore in January and in July. “+1 day” means it is already the next calendar day in Singapore, “−1 day” — still the previous one. Rows outside 9:00–18:00 are dimmed. The converter above works the other way too: press “Swap” to enter a time in Singapore.