Boston and Washington DC are in the same time zone. Both cities use Eastern Time (EST/EDT). When it's noon in Boston, it's also noon in Washington DC.
Both cities observe daylight saving time, switching between EST (UTC-5) in winter and EDT (UTC-4) in summer.
Any time works! Since both cities are in the same time zone, scheduling calls is never a problem. Business hours are identical.
Boston and Washington DC are connected by the Northeast Corridor, with Amtrak Acela trains and frequent flights. Both are major centers for politics, education, and business on the US East Coast.