I could be wrong, but I believe Arizona is -7 GMT in Standard Time, and we are now in Daylight Savings Time, so Arizona would be -6 GMT.
I know for my time zone (EST), we are usually -5 GMT. Right now however, we are -4 GMT and the original post has the correct times for me, which is 15:00pm EST (3pm).
Edit: Also, make sure your time zone settings are correct on the forum, otherwise I don't think the OP will give you the correct time. It's one of these two things I think. =D