New York and Washington DC are on the same time. Both cities use Eastern Time (EST/EDT, UTC-5/-4). When it's 12:00 PM in New York, it's also 12:00 PM in Washington DC.
Both cities observe daylight saving time on the same schedule, keeping them synchronized year-round.
Any time works! Since both cities share the same time zone, you can call during normal business hours (9:00 AM - 6:00 PM) without any conversion needed.
New York and Washington DC are two of America's most important cities - the financial capital and the political capital. The Amtrak Acela connects them in about 2.5-3 hours, making the route one of the busiest in North America.