If it is 1300Z in Philadelphia, what local time would it be in San Francisco if they are on PST?

To determine the local time in San Francisco when it is 1300Z (Zulu time), it is important to understand the relationship between Zulu time, which is equivalent to Coordinated Universal Time (UTC), and the local time zones of the cities in question.

Philadelphia operates on Eastern Standard Time (EST), which is UTC-5 hours when not accounting for daylight saving time. San Francisco is on Pacific Standard Time (PST), which is UTC-8 hours.

When it is 1300Z, you first need to convert that to Eastern Standard Time. By subtracting 5 hours from 1300Z, you arrive at 0800 EST in Philadelphia.

Next, to find the time in San Francisco, you further need to adjust for the difference in time zones. San Francisco, being 3 hours behind Philadelphia, requires you to subtract an additional 3 hours from the 0800 EST time.

Thus, 0800 minus 3 hours equals 0500. Therefore, when it is 1300Z in Philadelphia, it is indeed 0500 in San Francisco, corresponding to the answer provided. This correctly demonstrates the conversion of time from Zulu time to local time in different time zones.