Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

 ◄Detail► ◄Example►                          ◄Up► ◄Contents► ◄Index► ◄Back►
────────────────────────────────────────────────────────────────────────────
 
  Interrupt:   21h     Function:   57h
 
  Title:       Get or Set File Date and Time
 
  See also:    DOS File Date/Time Formats, Get Date, Get Time
 
  Description:
 
     Obtains or modifies the date and time stamp in a file's directory
     entry.
 
     Input                                       Output
 
     If getting date and time                    If function successful
       AH = 57h                                    Carry flag: clear
       AL = 00h                                  And if called with
       BX = Handle                               AL = 00h
                                                   CX = Time
     If setting date and time                      DX = Date
       AH = 57h
       AL = 01h                                  If function unsuccessful
       BX = Handle                                 Carry flag: set
       CX = Time                                   AX = Error code (01h
            Bits 0Bh-0Fh = hours (0-23)                 or 06h)
            Bits 05h-0AH = minutes (0-59)          See: ◄Error codes►
            Bits 00h-04h = 2-second increments
                           (0-29)
       DX = Date
            Bits 09h-0Fh = year (relative to
                           1980)
            Bits 05h-08h = month (1-12)
            Bits 00h-04h = day (1-31)
                                    -♦-