There is no time difference between Baltimore and Washington DC. Both cities use Eastern Time (EST, UTC-5 in winter and EDT, UTC-4 in summer). When it's 9:00 AM in Baltimore, it's also 9:00 AM in Washington DC.
Both cities observe daylight saving time on the same schedule, so they remain synchronized year-round.
Any time works! Since both cities share the same timezone, you can schedule calls during standard business hours (9:00 AM - 5:00 PM) without any time conversion needed.
Baltimore and Washington DC are just 40 miles apart and form the core of the Baltimore-Washington metropolitan area. The MARC commuter train and Amtrak connect the two cities in under an hour.