qa.hlp (Table of Contents; Topic list)
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Int 21H Function 57H
   Summary  Notes  Example  Back
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▀ The file must have been previously opened or created via a successful
  call to Int 21H Function 3CH, 3DH, 5AH, 5BH, or 6CH.
 
▀ If the 16-bit date for a file is set to zero, that file's date and time
  are not displayed on directory listings.
 
▀ A date and time set with this function will prevail, even if the file is
  modified afterwards before the handle is closed.
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