Rome to San Diego Time Difference
San Diego is 9 hours behind Rome. When it's 06:30:04 PM in Rome, it's 09:30:04 AM in San Diego.
How Many Hours Behind Is San Diego From Rome?
San Diego is 9 hours behind Rome. So Rome is 9 hours ahead of San Diego looking the other way — the same gap, described from the other end.
In practice that means a working day in Rome starts when it is already 12:00 AM in San Diego. The gap is not fixed all year: it becomes 8 hours on Sunday, October 25, 2026, when Rome changes its clocks.
Best Time to Call Rome and San Diego
Standard 9-to-5 hours in Rome and San Diego never overlap, so someone has to take the call outside their working day. The most workable window is 4:00 PM to 10:00 PM in Rome, which is 7:00 AM to 1:00 PM in San Diego.
both at work Rome only San Diego only neither — hours shown along the strip are Rome local time.
Convert a Specific Time
Pick any date and time in Rome to see the exact equivalent in San Diego.
Common Times Converted
Rome time on the left, San Diego time on the right.
Rome to San Diego: Full 24-Hour Conversion Table
Based on today, Sunday, October 11, 2026 in Rome. Shaded rows are working hours; the darker shade marks the hours when both cities are at work.
| Rome | San Diego | Working hours |
|---|---|---|
| 12:00 AM | 3:00 PM prev day | San Diego only |
| 1:00 AM | 4:00 PM prev day | San Diego only |
| 2:00 AM | 5:00 PM prev day | — |
| 3:00 AM | 6:00 PM prev day | — |
| 4:00 AM | 7:00 PM prev day | — |
| 5:00 AM | 8:00 PM prev day | — |
| 6:00 AM | 9:00 PM prev day | — |
| 7:00 AM | 10:00 PM prev day | — |
| 8:00 AM | 11:00 PM prev day | — |
| 9:00 AM | 12:00 AM | Rome only |
| 10:00 AM | 1:00 AM | Rome only |
| 11:00 AM | 2:00 AM | Rome only |
| 12:00 PM | 3:00 AM | Rome only |
| 1:00 PM | 4:00 AM | Rome only |
| 2:00 PM | 5:00 AM | Rome only |
| 3:00 PM | 6:00 AM | Rome only |
| 4:00 PM | 7:00 AM | Rome only |
| 5:00 PM | 8:00 AM | — |
| 6:00 PM | 9:00 AM | San Diego only |
| 7:00 PM | 10:00 AM | San Diego only |
| 8:00 PM | 11:00 AM | San Diego only |
| 9:00 PM | 12:00 PM | San Diego only |
| 10:00 PM | 1:00 PM | San Diego only |
| 11:00 PM | 2:00 PM | San Diego only |
Understanding the Rome – San Diego Time Difference
Rome runs on Europe/Rome, currently CEST (UTC+2:00). San Diego runs on America/Los_Angeles, currently PDT (UTC-7:00). The gap of 9 hours is simply the distance between those two offsets.
Both cities observe Daylight Saving Time, but they don't switch on the same date — so for a few weeks each year the gap between them is different again. The next shift is on Sunday, October 25, 2026, when Rome adjusts its clocks and the difference becomes 8 hours. Anything scheduled across that date needs checking again.
Full clock-change dates: Daylight Saving Time in the United States.
Rome today
San Diego today
Frequently Asked Questions
What is the time difference between Rome and San Diego?
San Diego is currently 9 hours behind Rome. That gap becomes 8 hours on Sunday, October 25, 2026, when Rome changes its clocks.
How many hours behind is San Diego from Rome?
San Diego is 9 hours behind Rome. Looking at it the other way, Rome is 9 hours ahead of San Diego.
What time is it in San Diego when it is 9:00 AM in Rome?
When it is 9:00 AM in Rome, it is 12:00 AM in San Diego.
Is San Diego ahead of or behind Rome?
San Diego is 9 hours behind Rome. Rome reaches each point in the day first, so San Diego is still getting started while the Rome working day is finishing.
What is the best time to call between Rome and San Diego?
Standard business hours in Rome and San Diego do not overlap at all, so one side has to step outside the 9-to-5. The most workable window is 4:00 PM to 10:00 PM in Rome, which is 7:00 AM to 1:00 PM in San Diego.
Does the time difference between Rome and San Diego change during the year?
Yes. Both cities observe Daylight Saving Time, and they do not always switch on the same date, so the gap between them shifts during the year. It changes to 8 hours on Sunday, October 25, 2026.
What time zones are Rome and San Diego in?
Rome uses the Europe/Rome time zone, currently CEST (UTC+2:00). San Diego uses America/Los_Angeles, currently PDT (UTC-7:00).