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▀ This function's register format is the same as that required for Int
  21H Function 2BH (Set Date).
 
▀ This function can be used together with Int 21H Function 2BH to find
  the day of the week for an arbitrary date. The current date is first
  obtained with Function 2AH and saved. The date of interest is then set
  with Function 2BH, and the day of the week for that date is obtained
  with a subsequent call to Function 2AH. Finally, the current date is
  restored with an additional call to Function 2BH, using the values ob-
  tained with the original Function 2AH call.
                                    -♦-