Path: utzoo!attcan!uunet!yale!spolsky-avram
From: spolsky-avram@CS.YALE.EDU (Joel Spolsky)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Looking for TSR to fix date when 40:70 is set
Message-ID: <37739@yale-celray.yale.UUCP>
Date: 13 Sep 88 23:40:36 GMT
References: <350@octopus.UUCP>
Sender: root@yale.UUCP
Reply-To: spolsky-avram@CS.YALE.EDU (Joel Spolsky)
Organization: Yale University Computer Science Dept, New Haven CT  06520-2158
Lines: 27

In article <350@octopus.UUCP> pete@octopus.UUCP (Pete Holzmann) writes:
| A while back I asked for help with DOS3.3; it rolls over the time
| at midnight, but not the date.
| 
| When the time rolls over from 23:59:59 to 24:00:00, DOS clear the time
| (at locations 40:6C and 40:6E) and sets 40:70 to one. The problem is
| that nothing seems to examine 40:70 and change the date when it is
| set!
| 
| Thus, what is needed is something to change the date whenever 40:70 is
| nonzero, and reset 40:70. Anybody have such a beast? I'd rather not
| have to reinvent yet another wheel...
| 

As I understand this, querying the time/date through the appropriate
DOS interrupt will update the date if necessary. As long as you don't
bypass DOS when you query the time/date the date should always be
correct. 

The only problem is when your PC goes 24 hours, from midnight to
midnight, without a single time-query (not even a single file
operation) in which case the date will be off by one.

Joel Spolsky             bitnet: spolsky@yalecs     uucp: ...!yale!spolsky
Yale University          arpa:   spolsky@yale.edu   voicenet: 203-436-1483
You can't expect to wield supreme executive power just 'cause 
some watery tart threw a sword at you!!