Philadelphia to London Time Difference: 5 Hours (EST vs. GMT)

Standard time (Nov–Mar): Philadelphia (EST, UTC-5) → London (GMT, UTC+0) = 5 hours.
Daylight time (Mar–Nov): Philadelphia (EDT, UTC-4) → London (BST, UTC+1) = 5 hours.

Year-round: 5-hour difference. Both observe DST but on different schedules (US: 2nd Sun Mar – 1st Sun Nov; UK: last Sun Mar – last Sun Oct). Two brief mismatch weeks per year:

• Late March: US on EDT, UK still on GMT → 4-hour gap (1 week).
• Late October/early November: UK on GMT, US still on EDT → 4-hour gap (1 week).

Practical Examples

• 12:00 PM Philadelphia → 5:00 PM London (standard)
• 9:00 AM Philadelphia earnings call → 2:00 PM London
• 6:00 PM London close → 1:00 PM Philadelphia

Tools

World Time Buddy, timeanddate.com, Google "time in London." Calendar apps auto-adjust if time zones set correctly.