Kolkata is 12.5 hours ahead of Seattle

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

When Seattle starts work, Kolkata is already winding down or offline — the 12.5-hour gap leaves no shared window. Default to async and only schedule live time when it genuinely needs a conversation — then make it count. Note that Seattle follows daylight saving while Kolkata stays put, so the times above drift by an hour seasonally.