There is no standard 8-to-6 overlap. Someone joins early or late.
San Francisco and Tehran live on different parts of the day. With 10.5 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. Daylight saving complicates things slightly: San Francisco observes it, Tehran doesn't, so the difference flexes by an hour part of the year.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
San Francisco America/Los Angeles | ||||||||||||||||||||||||
Tehran Asia/Tehran |
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