The best time to call San Francisco from Colombo is 7 AM–9 AM your time (Colombo). San Francisco, USA is 12 hours ahead of Colombo, Sri Lanka. There is no standard business hours overlap, so one party will need to adjust their schedule.
Call between 7 AM–9 AM Colombo time.
Colombo and San Francisco have no overlapping standard business hours. One party will need to adjust.
The best time to call San Francisco from Colombo is 7 AM–9 AM Colombo time. There is no standard business hours overlap between these cities.
San Francisco is 12 hours ahead of Colombo.
Avoid calling before 7.5 PM your time (they haven't started their day). Consider email or async communication for non-urgent matters.
No, Colombo and San Francisco do not have overlapping standard business hours (9 AM – 5 PM). You will need to schedule calls outside normal hours for one party.
No business hours overlap. You'll need to call outside standard hours — 7 AM–9 AM your time is the least disruptive window.
Both in business hours Both awake One outside comfort zone Sleeping hours
No standard business hours overlap (9 AM – 5 PM) between Colombo and San Francisco.
One party will need to adjust their schedule for calls.
| Colombo (GMT+5:30) | San Francisco (PDT) | Status |
|---|---|---|
| 7 AM | 7 PM | 🟡 They're awake |
| 8 AM | 8 PM | 🟡 They're awake |
| 9 AM | 9 PM | 🟡 They're awake |
| 10 AM | 10 PM | 🔴 They're sleeping |
| 11 AM | 11 PM | 🔴 They're sleeping |
| 12 PM | 12 AM | 🔴 They're sleeping |
| 1 PM | 1 AM | 🔴 They're sleeping |
| 2 PM | 2 AM | 🔴 They're sleeping |
| 3 PM | 3 AM | 🔴 They're sleeping |
| 4 PM | 4 AM | 🔴 They're sleeping |
| 5 PM | 5 AM | 🔴 They're sleeping |
| 6 PM | 6 AM | 🔴 They're sleeping |
| 7 PM | 7 AM | 🟡 They're awake |
| 8 PM | 8 AM | 🟡 They're awake |
| 9 PM | 9 AM | 🟡 They're awake |