Readme file for REDATE.COM (V2.3 : 2000-01-13)

REDATE is a simple DOS utility suitable as
millenium-fix and time-limit crack
for (legacy) DOS programs.

When, after installing REDATE, another DOS program tries to
get the current system date, then REDATE will return a patched
date to that program; the real system date is not altered.

More precisely, REDATE installs itself as a TSR program
that hooks INT21, function 2A.

REDATE also works in a DOS shell under Win95 and WinNT.
To use for a DOS program under Windows, create (or modify)
a bat-file containing some line (for example)
redate /i19991231
before a line calling the DOS program.

Calling options:
   redate /r          to remove the program
   redate /i          to install in 1980s-frame mode
   redate /iyyyymmdd  to install in fixed date mode

1980s-frame mode:
 the current day, month, unitary year remain unchanged,
 century and decade are altered to 198.
fixed date mode:
 possible years are 0000-2047, month 00-15, day 00-31.
 No further test is done, invalid input can produce
 inpredictable results (crash!)
 The eight digits must all be entered, and immediately
 after /i.
In both modes, the returned day of week is not recalculated:
every day is a Sunday!

Possible improvements:
* extension to include a hook for BIOS interrupt 1A, fct 04.
* extension for windows programs.


Author: phahn@vo.lu
Homepage: www2.vo.lu/homepages/phahn/default.htm