Riyadh to O'Fallon time converter

O'Fallon is 8 hours behind Riyadh. When it is 9:00 AM in Riyadh, it is 1:00 AM in O'Fallon.

Riyadh AST

Monday, October 19, 2026

O'Fallon CDT

Monday, October 19, 2026

Riyadh
Saudi Arabia
Mon, Oct 19
ASTUTC+3
O'Fallon
Illinois, United States
Mon, Oct 19
CDTUTC-5-8h
Finding your time zone…
Shared working hours (9:00–18:00)

Riyadh to O'Fallon conversion table

Every hour of today in Riyadh and the matching time in O'Fallon. Light rows are typical working hours (9:00–18:00).

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

Best time to call or meet

Both sides are at work from 5:00 PM – 6:00 PM in Riyadh (9:00 AM – 10:00 AM in O'Fallon).

Daylight saving time and the difference

The difference changes during the year because Riyadh and O'Fallon switch clocks on different dates:

  • Oct 19, 2026 – Nov 1, 2026: -8h
  • Nov 1, 2026 – Mar 14, 2027: -9h
  • Mar 14, 2027 – Oct 19, 2027: -8h

Distance

Riyadh and O'Fallon are 11,655 km (7,242 miles) apart in a straight line.

More conversions

O'Fallon to RiyadhRiyadh to New YorkRiyadh to LondonRiyadh to Los AngelesRiyadh to ChicagoRiyadh to TorontoRiyadh to São PauloRiyadh to ParisRiyadh to BerlinRiyadh to MoscowRiyadh to DubaiRiyadh to New DelhiRiyadh to Bangkok
New York to O'FallonLondon to O'FallonLos Angeles to O'FallonChicago to O'FallonToronto to O'FallonSão Paulo to O'FallonParis to O'FallonBerlin to O'FallonMoscow to O'FallonDubai to O'FallonNew Delhi to O'FallonBangkok to O'Fallon

Questions and answers

What is the time difference between Riyadh and O'Fallon?

O'Fallon is 8 hours behind Riyadh.

What time is it in O'Fallon when it is 9 AM in Riyadh?

When it is 9:00 AM in Riyadh, it is 1:00 AM in O'Fallon.

When is the best time to call O'Fallon from Riyadh?

Both sides are at work from 5:00 PM – 6:00 PM in Riyadh (9:00 AM – 10:00 AM in O'Fallon).

Does the time difference between Riyadh and O'Fallon change?

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