4 Replies Latest reply: Oct 23, 2009 11:50 PM by baltwo
terry3201 Level 1 Level 1

How can I find out what date OS X was installed on my macbook pro?


Macbook Pro 15", Mac OS X (10.5.8)
  • K Shaffer Level 6 Level 6
    If the computer's drive has not been reformatted and no Archive & Install
    or reinstall actions have taken place on the computer, the first install and
    run-up event should be in some of the system's logs; failing that, but still
    no major changes in the computer, the oldest date found in Get Info on
    the computer's hard disk drive (there would be two, first initialization or
    format for use of the drive in the Mac, and second, Modification Date)
    as the approximate date of installation.

    (You can highlight the Macintosh HD icon and choose Get Info for these.)

    There should also be other dates, however they may have been wiped
    or changed if anything was done in the System where utilities had been
    used to modify logs or cache histories. Tools such as OnyX & others can
    be used to wipe these kinds of data histories from the computer.

    If the hard disk drive has not been wiped, nor the creation date of any
    partitions made for that installation, an approximate date may be found.
    Disk Utility may be able to find some relevant information, probably not
    too different than that found by Get Info. And lastly (perhaps first) use
    of the Console utility in the Utilities Folder, may be able to show you a
    log of all activity; the oldest dates of plausible likelihood may be the one.

    The most recent installation and modification dates should be apparent;
    and any previous system info, should a complete reformat have been
    done and a new full install performed, would be gone from your view.

    Since dates of changes made to the system would be newer than the
    first original installation, many other dates and changes each time a
    software update or new App, a widget, or Disk Utility's 'repair disk or
    repair disk permissions' were run, would offer a newer date.

    These are possible leads. If I had the MacBook/Pro here, I could find
    the date common to the first OS X run of the current installed system;
    but if it were a clone, the date may not be of that earlier event.

    Console logs cover many aspects of the system and what runs within it.
    So, that may be a place to look. And there are several kinds of logs.

    Good luck & happy computing!
  • baltwo Level 9 Level 9
    Apple menu->About this Mac->More Info->Software->Extensions, and check the last modified dates. Alternatively, Console->Install logs.
  • Alexandre Level 3 Level 3
    Further to K Schaffer's reference to the very extensive console (which should truly answer all), there is another place which quickly shows the software updates installed via "software update": it's in system preferences/Software Update/Installed Updates (tab).
    Enjoy your Mac.
  • baltwo Level 9 Level 9
    That only lists the items you downloaded and installed via Software Update, unless you manually updated the /Library/Logs/SoftwareUpdate.log file with any that you downloaded and installed.