Time difference: UTC (London) and AST (Riyadh)
UTC (London) is 3 hours behind AST (Riyadh). Midday in UTC (London) lines up with 15:00 in AST (Riyadh).
UTC (London) is in the Europe/London timezone. AST (Riyadh) is in Asia/Riyadh. The difference is 3 hours.
Business hours comparison
There is a 5-hour window each day where both UTC (London) and AST (Riyadh) are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
When to schedule across time zones
Both UTC (London) and AST (Riyadh) are in standard hours simultaneously for 5h per day. 3 recommended slots shown below.
09:00 London / 12:00 Riyadh✓ Both working
10:00 London / 13:00 Riyadh✓ Both working
11:00 London / 14:00 Riyadh✓ Both working
Based on standard 09:00–17:00 working hours in each location's local time.
How to work with UTC (London) and AST (Riyadh) time zones
Working across UTC (London) (United Kingdom) and AST (Riyadh) (Saudi Arabia) involves a 3-hour gap. The good news: there is a 5-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.
💡 How to schedule across these time zones
✅09:00–10:00 in UTC (London) = 12:00–13:00 in AST (Riyadh). Both sides are in standard business hours during this window.
✅10:00–11:00 in UTC (London) = 13:00–14:00 in AST (Riyadh). Both sides are in standard business hours during this window.
✅11:00–12:00 in UTC (London) = 14:00–15:00 in AST (Riyadh). Both sides are in standard business hours during this window.
DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.
Get the Extension — Free →Use the time slider above to find the exact equivalent time for any moment in UTC (London). The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.