Table of Contents

Note: This API call is for DOS and Win16 personality only. Use Family API for portability.

2018/09/07 05:04 · prokushev · 0 Comments

Int 21H, AH=57H, AL=00H

Version

2 and higher

Brief

GET FILE'S LAST-WRITTEN DATE AND TIME

Family API

Input

AX = 5700h
BX = file handle

Return

CF clear if successful

    CX = file's time (see #01665)
    DX = file's date (see #01666)
CF set on error
    AX = error code (01h,06h) (see #01680)

Notes

under DR DOS 3.41 and 5.0, this function returns 0 (no date/time) for character devices; MS-DOS returns date and time of opening

Bitfields for file time:

Bit(s) Description
15-11 hours (0-23)
10-5 minutes
4-0 seconds/2

Bitfields for file date:

Bit(s) Description
15-9 year - 1980
8-5 month
4-0 day

AX=5701h,AX=5704h“Windows95”

Note

Text based on Ralf Brown Interrupt List Release 61

2018/09/04 17:23 · prokushev · 0 Comments