Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 57h
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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.
                                    -♦-