After reboot system time changed and menu bar items changed position I'm new to Apple Mac OS, just Bought a new Macbook pro 13" Mid 2012 a month ago. Yesterday everything was good and working fine. I shut down system and went to sleep. Today when I Started my system I found some significant changes.

My system time went wrong from AM/PM to 24 hours which I fixed from apple Date/Time preferences. The but it just worked for the Menu Bar Display. System time is still 24hour format I can see in Terminal and start up Login Screen. In the Menu bar it is now showing the day number of the Week not the name as it was doing previously.

2nd is that in meny Bar the time is now shifted to left of Battery which was by default to right most and right to battery:



What is wrong with my system. I installed Macports yesterday. Don't know what else has been changed :(.
Menu bar icons can be repositioned by dragging them left and right with the Cmd pressed.