Weird Time Problem

[Richard]

My custom shell grabs the current time when the shell program starts up. It
then has a counter that counts the number of seconds, minutes, hours, and
days the machine has been up. It works great, 95% of the time.

Sometimes when XPe Boots, the shell loads and starts its counting. After
about 30 seconds, the cursor hour glass comes up for a second and my time
changes to an hour before the time was originally when my shell started.
This plays havoc on my shell count since the current time now is before the
start time.

I use GMT time, the only thing I can think of is that something happens
during boot where windows converts the time. 95% of the time, my shell
loads after that conversion, sometimes, it may load before that conversion.

I'm doing a simple deal like this....

On Form Create Event....
CompStartTime := Now;

Then once per second, I get the current time and do
a subtraction to find elapsed time. ElapsedTime := Now - CompStartTime;
Then I decode Elapsed time into the segments I need.

Always works except for the occassional boot problem.

Any idea what's going on and how I may get around it?

Richard

 

[KM]

Richard,

Sounds like the daylight savings time adjustments. Try to disable it.

Also these links may be helpful to you:
http://msdn.microsoft.com/embedded/community/community/tips/xp/timezone/default.aspx


http://groups.google.com/[email protected]&rnum=3

 

[Slobodan Brcin \(eMVP\)]

Hi Richard,

Don't use time for counting purposes like this.
Use functions like GetTickCount that do not depend on time changes made by user or daylight saving.

You can always calculate day:hour:min:sec:ms from above value.

Best regards,
Slobodan

 

[Richard]

Thanks, I'll check it out.

Richard

Hi Richard,

Don't use time for counting purposes like this.
Use functions like GetTickCount that do not depend on time changes made by user or daylight saving.

You can always calculate day:hour:min:sec:ms from above value.

Best regards,
Slobodan

 

[Guest]

Slobodan's suggestion is the best for any "relative" time counting requirement as the additional benefit of using GetTickCount is that the machine run time is still accurate even if the user changes the time or auto time sync. etc...