Chennai is 12.5 hours ahead of San Diego

There is no standard 8-to-6 overlap. Someone joins early or late.

The 12.5-hour offset between San Diego and Chennai means there's no point hunting for a 9-to-5 overlap — there isn't one. Expect compromise: someone in San Diego or Chennai will need to take the call outside the usual 9-to-5, so share that load. Keep an eye on the calendar — San Diego observes daylight saving and Chennai doesn't, which nudges this window by an hour twice a year.