Seattle is 12.5 hours behind Kolkata

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

The 12.5-hour difference means Kolkata and Seattle miss each other entirely during regular office hours. Where you can, lean on async updates and save live calls for when one team is happy to start early or stay late. Don't be caught out by clock changes — Seattle observes daylight saving and Kolkata doesn't, so the offset varies by an hour through the year.