SGT to GMT Converter

Which SGT and which GMT?

Zone abbreviations are ambiguous, so this page starts by pinning both down. SGT here is Singapore Time: the IANA zone Asia/Singapore, anchored on Singapore. GMT here is Greenwich Mean Time: Europe/London, anchored on London. Note that GMT is also UTC±0 kept year-round, which London does not do; this page means only the London sense.

Singapore keeps UTC+8 all year — its January and July offsets are both UTC+8 — so SGT has no summer-time sibling and never needs disambiguating by season.

GMT in the everyday sense means London time, whichever of GMT or BST (British Summer Time) is in force. London is not on GMT all year: its offset is UTC±0 while standard time applies (its January offset) and UTC+1 while daylight saving is active (its July offset). As of September 2026 it is on BST (UTC+1). Wherever this page writes GMT, read it as "London time on the date in question".

The difference as of September 2026

As of September 2026, London is 7 hours behind Singapore. Singapore is on UTC+8 (no seasonal change) and London is on UTC+1 (BST, daylight saving in effect). Subtract one offset from the other and you have the gap. As wall clocks: 9:00 AM in Singapore is 2:00 AM in London, 5:00 PM in Singapore is 10:00 AM in London, and 9:00 AM in London is 4:00 PM in Singapore.

The calendar date is part of the conversion on this pair. A 9:00 AM to 5:00 PM day in Singapore reads 2:00 AM to 10:00 AM in London, and a 9:00 AM to 5:00 PM day in London reads 4:00 PM to 12:00 AM the next day in Singapore, so a time on one side can belong to a different date on the other. The converter above flags each reading that lands on the previous or next day; the date you enter is the date on the From side's clock.

Next scheduled clock changes: no clock change is scheduled for Singapore within the next 450 days; clocks in London go back 1 hour on Sunday, October 25, 2026 (local date), moving the offset from UTC+1 to UTC±0. Only London's changes matter to this pair, and each one moves the gap.

How the gap changes through the year

Only one side of this pair changes its clocks. Singapore keeps UTC+8 all year — its January and July offsets are identical — while London moves between UTC±0 (its January offset, GMT) and UTC+1 (its July offset, BST). Every time London shifts, the whole difference shifts with it, because the other offset is standing still. So the gap takes two values a year: London is 8 hours behind Singapore while London is on GMT, and 7 hours behind Singapore while it is on BST.

Over the year scanned from Sep 7, 2026, the engine finds two such moves, each at the exact minute London's clocks change:

• Sunday, October 25, 2026 (London date): the gap goes from 7 hours behind to 8 hours behind.
• Sunday, March 28, 2027 (London date): the gap goes from 8 hours behind to 7 hours behind.

The practical consequence is the one that catches recurring meetings. A call fixed at 9:00 AM on Singapore's clock is 1:00 AM in London while London is on GMT, and 2:00 AM while it is on BST. Nobody in Singapore sees the meeting move, but on London's calendar it jumps by 1 hour on each of the dates above. The reverse is just as true: a 9:00 AM slot fixed on London's clock lands at 5:00 PM or 4:00 PM in Singapore depending on the season. Whichever side owns the invitation, the other side sees it move twice a year — which is exactly what the converter above accounts for when you give it a date.

Working hours that overlap

Assume a 9:00 AM to 5:00 PM day on both sides. Because the gap changes during the year, the overlap changes with it, so it is shown for each gap the pair takes:

• London 8 hours behind Singapore (SGT / GMT; 154 of the 365 days scanned): no overlap at all: when it is 9:00 AM in London it is already 5:00 PM in Singapore.
• London 7 hours behind Singapore (SGT / BST; 211 of the 365 days scanned): 1 hour of shared working time: 4:00 PM to 5:00 PM in Singapore, which is 9:00 AM to 10:00 AM in London.

The 9-to-5 window is a convention, not a fact about anyone's real hours. The Meeting Planner lets you set each side's actual working hours and shows the overlap for the exact date you are planning.

Converting GMT to SGT

This page serves both directions, because the reverse conversion is the same gap with the sign flipped. As of September 2026, Singapore is 7 hours ahead of London, so:

• 9:00 AM SGT (Singapore) = 2:00 AM GMT (London)
• 9:00 AM GMT (London) = 4:00 PM SGT (Singapore)
• 5:00 PM GMT (London) = 12:00 AM the next day SGT (Singapore)

To run GMT to SGT in the converter above, swap the From and To menus; the result shows both offsets for the date you enter and flags a day change whenever the reading lands on the previous or next calendar day. The readings above hold only while the gap is 7 hours behind; on the dates listed in the section above they move, in both directions at once.

More on these zones

• Current time in Singapore — live clock, offset and next clock change.
• Current time in London — live clock, offset and next clock change.
• Time Zone Converter — any city to any city, DST-correct for the date.
• Meeting Planner — overlap for your real working hours.
• All zone-to-zone converters — the other corridors on this site.

SGT to GMT — frequently asked questions

Conversions are computed locally in your browser from its IANA time zone data; nothing you enter is transmitted. The schedule and offsets on this page were derived from the same database at build time, as of September 2026. Jurisdictions occasionally change DST law with short notice, and the IANA database follows reality — for legally critical timing, confirm against an official source. See the methodology page.