List of extended bios date\time functions for Copyit v5.5a:

INT AH AL
--- -- --
 21 57 01 DOS 2+ - SET FILE'S LAST-WRITTEN DATE AND TIME
 21 57 05 MS-DOS 7/Windows95 - SET LAST ACCESS DATE AND TIME
 21 57 07 MS-DOS 7/Windows95 - SET CREATION DATE AND TIME
 21 57 00 DOS 2+ - GET FILE'S LAST-WRITTEN DATE AND TIME
 21 57 04 MS-DOS 7/Windows95 - GET LAST ACCESS DATE AND TIME
 21 57 06 MS-DOS 7/Windows95 - GET CREATION DATE AND TIME

INT 21 - Windows95 - LONG FILENAME FUNCTIONS
 AH = 71h
 AL = function
   0Dh reset drive (see AX=710Dh)
   39h create directory (see AX=7139h)
   3Ah remove directory (see AX=713Ah)
   3Bh set current directory (see AX=713Bh)
   41h delete file (see AX=7141h)
   43h get/set file attributes (see AX=7143h)

INT 21 - Windows95 - LONG FILENAME - EXTENDED GET/SET FILE ATTRIBUTES
  AX = 7143h
  DS:DX -> ASCIZ filename
  BL = action
    00h retrieve attributes
        Return: CX = file attributes (see #01420)
    01h set attributes
        CX = attributes
    02h get physical size of compressed file
        Return: DX:AX = actual disk usage of file, in bytes
    03h set last write date/time
        DI = new last-write date (see #01666)
        CX = new last-write time (see #01665)
    04h get last write date/time
        Return: CX = last write time (see #01665)
          DI = last write date (see #01666)
    05h set last access date
        DI = new last-access date (see #01666)
    06h get last access date
        Return: DI = last access date (see #01666)
    07h set creation date/time
        DI = new creation date (see #01666)
        CX = new creation time (see #01665)
        SI = hundredths (10-millisecond units past time in CX, 0-199)
    08h get creation date/time
        Return: CX = creation time (see #01665)
          DI = creation date (see #01666)
          SI = hundredths (10-millisecond units past time in CX)
    47h get current directory (see AX=7147h)
    4Eh find first file (see AX=714Eh)
    4Fh find next file (see AX=714Fh)
    56h move (rename) file (see AX=7156h)
    60h truename (see AX=7160h/CL=00h,AX=7160h/CL=02h)
    6Ch create/open file (see AX=716Ch)
    A0h get volume information (see AX=71A0h)
    A1h terminate FindFirst/FindNext (see AX=71A1h)
    A6h get file information (see AX=71A6h)
    A7h time conversion (see AX=71A7h/BL=00h,AX=71A7h/BL=01h)
    A8h generate short filename (see AX=71A8h)
    A9h server create/open file (see AX=71A9h)
    AAh create/terminate SUBST (see AX=71AAh/BH=00h,AX=71AAh/BH=02h)

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