Recently it was discovered that in the last update the time setting for the site was wrong. This has been fixed and the site time is correct. If your timestamps for PMs and Forum posts are wrong you can fix this by clicking on the Edit Profile button under options in the top right under your avatar. The icon looks like this ---->
Once there scroll down and find Time Offset and change to your time zone. Click save and this should set all the timestamps to your time zone.