Difference between GetLocalTime and GetSystemTime ?

Question

0.00/5 (No votes)

See more:

Hi,

I am using GetLocalTime in my code to check how much time the perticular function is taking for processing.

For this purpose which one is the best choice GetLocalTime or GetSystemTime ?

Are they same ? which one should be used if i am measuring the performance of the code.

Thanks in advance.

Posted 18-Jul-11 20:47pm

PrafullaVedante

Add a Solution

2 solutions

Solution 2

[Answering a follow-up question]

As this is C++/CLI, you can use .NET libraries. For performance measuring, use the class System.Diagnostics.Stopwatch as it has much better accuracy (sub-microsecond on most systems). You can inquire if the high resolution operation is accessible and the implemented frequency by calling static properties System.Diagnostics.Stopwatch.IsHighResolution and System.Diagnostics.Stopwatch.Frequency. See http://msdn.microsoft.com/en-us/library/system.diagnostics.stopwatch.aspx[^].

—SA

Posted 19-Jul-11 18:51pm

Sergey Alexandrovich Kryukov

Updated 20-Jul-11 16:05pm

v2

Comments

Espen Harlinn 20-Jul-11 19:08pm

Stopwatch is definitely the best solution provided by .Net - my 5

Sergey Alexandrovich Kryukov 20-Jul-11 22:03pm

I think you brought to my attention much better resolution of this class a while ago -- thank you very much.
--SA

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Prerak Patel · Accepted Answer · 2011-07-18T20:53:00

Solution 1

GetLocalTime gives you time based on current timezone.
GetSystemTime is the system time and has nothing to do with timezone.

Posted 18-Jul-11 20:53pm

Prerak Patel

Comments

PrafullaVedante 19-Jul-11 2:58am

Which one should i use to measure the performance ?

CPallini 19-Jul-11 3:08am

As far as you use them consistently (i.e. always the same) it doesn't matter, since performance is measured using time intervals, i.e. time differences (however, if you're using Windows, maybe QueryPerformanceCounter would be better for the purpose).

PrafullaVedante 19-Jul-11 4:12am

Thanks for the suggession. I am using it , but the problem is how to write it to the file, as it takes __int64 as an output parameter

Sergey Alexandrovich Kryukov 20-Jul-11 0:52am

It's System.Diagnostics.Stopwatch, please see my answer.
--SA

Sergey Alexandrovich Kryukov 20-Jul-11 0:53am

Answered, my 5. OP ***real*** question was about timing for performance measuring, so the answer is "neither". Please see my solution.
--SA