timestamp error and not receiving texts because of change in time

okay hi, i have two things i need help with. i was messing with the time and date (mainly date, not time) a lot for a game so i kept going a few days later, and when i was at 8/18/15, i texted someone. now, my phone is back to the original right time and date but on my messages app, on the side, the timestamp says 8/18/15 , even after texting the person multiple times in the right times. nothing will work. it's just annoying to see, does anyone know how to fix it?

my second problem, while i was messing with the time, fowarding it, i didn't receive any imessages and i still didn't receive them, even after going back. i've tried turning on and off my phone and imessage and automatic time zone thing, but nothing's working.