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package HAL.Real_Time_Clock is

   type RTC_Hour is mod 24;
   type RTC_Minute is mod 60;
   type RTC_Second is mod 60;

   type RTC_Time is record
      Hour : RTC_Hour;
      Min  : RTC_Minute;
      Sec  : RTC_Second;
   end record;

   type RTC_Month is (January, February, March, April, May, June, July, August,
                      September, October, November, December);
   type RTC_Day_Of_Week is (Monday, Tuesday, Wednesday, Thursday, Friday,
                            Saturday, Sunday);
   type RTC_Day is range 1 .. 31;
   type RTC_Year is range 00 .. 99;

   type RTC_Date is record
      Day_Of_Week : RTC_Day_Of_Week;
      Day         : RTC_Day;
      Month       : RTC_Month;
      Year        : RTC_Year;
   end record;

   for RTC_Day_Of_Week use (Monday    => 1,
                            Tuesday   => 2,
                            Wednesday => 3,
                            Thursday  => 4,
                            Friday    => 5,
                            Saturday  => 6,
                            Sunday    => 7);

   for RTC_Month use (January   => 1,
                      February  => 2,
                      March     => 3,
                      April     => 4,
                      May       => 5,
                      June      => 6,
                      July      => 7,
                      August    => 8,
                      September => 9,
                      October   => 10,
                      November  => 11,
                      December  => 12);

   type RTC_Device is limited interface;
   type Any_RTC_Device is access all RTC_Device'Class;

   procedure Set (This : in out RTC_Device;
                  Time : RTC_Time;
                  Date : RTC_Date) is abstract;

   procedure Get (This : in out RTC_Device;
                  Time : out RTC_Time;
                  Date : out RTC_Date) is abstract;
   --  This procedure ensures coherent time and date values

   function Get_Time (This : RTC_Device)
                      return HAL.Real_Time_Clock.RTC_Time
                      is abstract;

   function Get_Date (This : RTC_Device)
                      return HAL.Real_Time_Clock.RTC_Date
                      is abstract;

end HAL.Real_Time_Clock;