Philadelphia and Washington DC are in the same time zone. When it's 3:00 PM in Philadelphia, it's also 3:00 PM in Washington DC. Both cities use Eastern Time (ET) and observe daylight saving time together.
These two cities are only about 140 miles apart along the I-95 corridor, part of the Northeast Megalopolis. Both are significant in American history - Philadelphia as the birthplace of the nation and Washington DC as its capital.
Any time works! With no time difference, standard business hours of 9:00 AM - 6:00 PM work perfectly for both cities.
Philadelphia and Washington DC are connected by Amtrak's Northeast Regional and Acela trains, with travel times of about 1.5-2 hours. Both cities are major centers for government, education, and healthcare industries.