London to Mason City time converter

Mason City is 6 hours behind London. When it is 9:00 AM in London, it is 3:00 AM in Mason City.

London BST

Wednesday, October 21, 2026

Mason City CDT

Tuesday, October 20, 2026

London
United Kingdom
Wed, Oct 21
BSTUTC+1
Mason City
Iowa, United States
Tue, Oct 20
CDTUTC-5-6h
Finding your time zone…
Shared working hours (9:00–18:00)

London to Mason City conversion table

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

LondonMason City
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 Mason City).

Daylight saving time and the difference

The difference changes during the year because London and Mason City switch clocks on different dates:

  • Oct 21, 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 21, 2027: -6h

Distance

London and Mason City are 6,591 km (4,095 miles) apart in a straight line.

More conversions

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Questions and answers

What is the time difference between London and Mason City?

Mason City is 6 hours behind London.

What time is it in Mason City when it is 9 AM in London?

When it is 9:00 AM in London, it is 3:00 AM in Mason City.

When is the best time to call Mason City from London?

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

Does the time difference between London and Mason City change?

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