London to Upper Alton time converter

Upper Alton is 6 hours behind London. When it is 9:00 AM in London, it is 3:00 AM in Upper Alton.

London BST

Monday, October 19, 2026

Upper Alton CDT

Monday, October 19, 2026

London
United Kingdom
Mon, Oct 19
BSTUTC+1
Upper Alton
Illinois, United States
Mon, Oct 19
CDTUTC-5-6h
Finding your time zone…
Shared working hours (9:00–18:00)

London to Upper Alton conversion table

Every hour of today in London and the matching time in Upper Alton. Light rows are typical working hours (9:00–18:00).

LondonUpper Alton
12:00 AM6:00 PM−1 day
1:00 AM7:00 PM−1 day
2:00 AM8:00 PM−1 day
3:00 AM9:00 PM−1 day
4:00 AM10:00 PM−1 day
5:00 AM11:00 PM−1 day
6:00 AM12:00 AM
7:00 AM1:00 AM
8:00 AM2:00 AM
9:00 AM3:00 AM
10:00 AM4:00 AM
11:00 AM5:00 AM
12:00 PM6:00 AM
1:00 PM7:00 AM
2:00 PM8:00 AM
3:00 PM9:00 AM
4:00 PM10:00 AM
5:00 PM11:00 AM
6:00 PM12:00 PM
7:00 PM1:00 PM
8:00 PM2:00 PM
9:00 PM3:00 PM
10:00 PM4:00 PM
11:00 PM5:00 PM

Best time to call or meet

Both sides are at work from 3:00 PM – 6:00 PM in London (9:00 AM – 12:00 PM in Upper Alton).

Daylight saving time and the difference

The difference changes during the year because London and Upper Alton switch clocks on different dates:

  • Oct 19, 2026 – Oct 25, 2026: -6h
  • Oct 25, 2026 – Nov 1, 2026: -5h
  • Nov 1, 2026 – Mar 14, 2027: -6h
  • Mar 14, 2027 – Mar 28, 2027: -5h
  • Mar 28, 2027 – Oct 19, 2027: -6h

Distance

London and Upper Alton are 6,735 km (4,185 miles) apart in a straight line.

More conversions

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New York to Upper AltonLos Angeles to Upper AltonChicago to Upper AltonToronto to Upper AltonSão Paulo to Upper AltonParis to Upper AltonBerlin to Upper AltonMoscow to Upper AltonDubai to Upper AltonNew Delhi to Upper AltonBangkok to Upper AltonSingapore to Upper Alton

Questions and answers

What is the time difference between London and Upper Alton?

Upper Alton is 6 hours behind London.

What time is it in Upper Alton when it is 9 AM in London?

When it is 9:00 AM in London, it is 3:00 AM in Upper Alton.

When is the best time to call Upper Alton from London?

Both sides are at work from 3:00 PM – 6:00 PM in London (9:00 AM – 12:00 PM in Upper Alton).

Does the time difference between London and Upper Alton change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.