Another Virgin user! Let's hope you read this.
Time thing is carrier dependent so Virgin, I think. Have you got MMS working? And if so, can you tell me how? (unless it worked out of the box).
I am following this thread religiously.
I actually went with my Virgin SIM to P4U and tested the (first) phone on the spot making sure it worked before leaving. Then got up, put it in my pocket and paid and yes, I was lucky enough to have it work out of the box. Didn't pick the time/date issue until later but this was the least of my problems as the phone creaked and cracked hopelessly almost from day one.
I recently received a replacement phone from Nokia (it is absolutely amazing, how a Lumia 920 should be) already Porticoed but it was never right.
It had quite a few issues (see below) and eventually I had to flash it (hard reset didn't seem to have any effect).
Apart from the time/date issue when reset and the brightness bug, the tiles stopped randomly updating, Find my phone was showing as off but when going into the actual settings it was on, and the store tile never updated for about 10 days. In all the phone was not totally right.
After flashing and restoring from backup, the tiles update with no problems, the store tile showed 7 updates within 30' and all the settings are correct.
This leads me to believe that as with desktop MS OSs one can actually have a dodgy/corrupt WP8 installation that needs "imaging". Unbelievable I know but there you have it.