INT 21,57 - Get/Set File Date and Time Using Handle

	AH = 57h
	AL = 00  get date and time
	   = 01  set date and time
	   = 02  ??? (DOS 4.0+ undocumented)
	   = 03  ??? (DOS 4.0+ undocumented) 
	   = 04  ??? (DOS 4.0+ undocumented)
	BX = file handle
	CX = time to set (if setting)
	DX = date to set (if setting)
	ES:DI = pointer to buffer to contain results


	on return:
	AX = error code if CF set  (see  DOS ERROR CODES)
	CX = file time (if reading, see below)
	DX = file date (if reading, see below)

	Time encoding:

	│F│E│D│C│B│A│9│8│7│6│5│4│3│2│1│0│  Time in CX
	 │ │ │ │ │ │ │ │ │ │ │ └─┴─┴─┴─┴────  two second incr (0-29)
	 │ │ │ │ │ └─┴─┴─┴─┴─┴─────────────  minutes 0-59)
	 └─┴─┴─┴─┴────────────────────────  hours (0-29)

	Date Encoding

	│F│E│D│C│B│A│9│8│7│6│5│4│3│2│1│0│  Date in DX
	 │ │ │ │ │ │ │ │ │ │ │ └─┴─┴─┴─┴────  day (1-31)
	 │ │ │ │ │ │ │ └─┴─┴─┴─────────────  month (1-12)
	 └─┴─┴─┴─┴─┴─┴────────────────────  year - 1980