Time on the iPhone compared to other apple devices

Hi,
This is something I've just noticed, and I wanted to share it here and see if anyone has picked up on this.
When working with multiple apple devices, I noticed, that when checking the time in the status bar, on the iPad and on the Mac, the time is the same. However, on the iPhone the time always seems to be one minute behind. I was thinking it could just be the version of the iPhone that could have that issue, but I checked it with other versions of the iPhone and got the same thing.
It's not much of a problem, just something I noticed and was wondering if anyone else has.
Hubert