When I was in the process of customizing my mac recently I changed the way my mac displayed date and time in the top right corner of my screen. After about a week or so suddenly it would only display the minutes and seconds of the time. After spending 1 hour trying to get it back to normal I succeeded. But then about two days later I discovered that all my date and time stamps in finder, on my photos in iphoto et cetera are only displayed in their time, no date. I know I could go through the process of going through and changing each and every one but I did not know whether or not there was a way to reset this specific setting back to factory defaults and go from there. Thank you for any help.