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