Function  57h   Get for Set File Date and Time
entry	AH	57h
	AL	00h	Get Date and Time
			BX	handle
			return	CX	date
				DX	time
		01h	Set Date and Time
			BX	handle
			CX	time  bits:
				     0Bh-0Fh	hours(0-23)
				     05h-0Ah	minutes(0-59)
				     00h-04h	2 second increments (0-29)
			DX	date  bits:
				     09h-0Fh	year(relative to 1980)
				     05h-08h	month(1-12)
				     00h-04h	day(1-31)
return	CF	set if error
		AX	error code
note 1) The file must have been previously opened or created via a successful 
	call to Int21f3C,Int21f3D,Int21f5A or Int21f5B.
     2) The date and time are in the format used in the directory, with bit 0 
	the rightmost, or least significant, bit. struc -Directory
     3) If the 16-bit date for a file is set to zero, that file's date and time 
	are not displayed on directory listings.
     4) A date and time set with this function will prevail, even if the file 
	is modified afterwards before the handle is closed.