Philadelphia, like all of Pennsylvania, lies in the Eastern Time Zone. For most of the year, from early March through early November, Pennsylvania observes Daylight-Saving Time. During these months, Philadelphia is four hours behind Greenwich Mean Time (GMT), or Coordinated Universal Time (UTC) as it is also called. For the rest of the year, from early November through early March, Philadelphia is five hours behind GMT/UTC.
Daylight-Saving Time in the United States commences each year at 2 a.m. on the second Sunday of March and ends each year at 2 a.m. on the first Sunday of November. Consult a calendar to find out the dates of these Sundays in any particular year.
The whole of Saudi Arabia is in one time zone, which is three hours ahead of GMT/UTC. As Saudi Arabia does not observe Daylight Saving Time, the time difference between GMT/UTC and Saudi Arabia remains the same throughout the year.
During Daylight-Saving Time, Philadelphia is seven hours behind Saudi Arabia. So, at 1 p.m. on April 1 in Philadelphia, the time in Saudi Arabia is 8 p.m. However, for the remainder of the year, Philadelphia is eight hours behind Saudi Arabia. For example, at 1 p.m. on Feb. 1 in Philadelphia, the time in Saudi Arabia is 9 p.m.
In the months of Daylight-Saving Time, add seven hours to Philadelphia time to find Saudi Arabia time, and subtract seven hours from Saudi Arabia time to calculate Philadelphia time. During the rest of the year, add or subtract eight hours.
