For so long, I have been wishing "Happy Pi PM" to my friends and colleagues at 3:14 PM. However, this doesn't seem to be appropriate since 3:14 PM is not really 3.14 PM. In fact, 3:14 PM is 314⁄60 PM which when expressed in decimal representation turns out to be 3.23333 PM, accurate up to 5 decimal places.
The value of π accurate up to 5 decimal places is 3.14159. Now, .14159 hour = 509.724 seconds ≈ 8 minutes and 30 seconds, or 8½ minutes.
So, π PM turns out be 3:08:30 PM or 8½ minutes past 3 PM.