Show AM/PM

  Calendar uses a 12-hour time system with A.M. and P.M. in
  its Day view for both the clock and the timeslots.

  You can change to a 24-hour time system by disabling Show
  AM/PM in the General dialog box, which you can access
  from the Options menu.  If you make this change, 1:30 P.M.
  becomes 13:30, and so on.

  Additional topics:

  *   Using the Live Scrolling Option

  *   Making the Day View Read Right to Left

  *   Enabling and Disabling Blank Days in the Month
      View

  *   Printing Blank Days

  *   Boxing the Current Day

  *   Marking Past Days

  *   Choosing the Days of the Week to Appear in Bold

  *   Choosing the First Day of the Week

  *   Enabling and Disabling Week Numbers

  *   Choosing the First Week of the Year

  *   Choosing Which View Appears First

  *   Starting Calendar as Iconized or Displayed

  *   Customizing General Settings