HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

             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

Esc or Alt-X to exit int 21,57 Home/PgUp/PgDn/End ←↑↓→