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How important is it to use a variable for DateTime.Today when concerned about performance?

Anonymous User213406-Apr-2013
Hi All!

It was in response to a post that contained the code:

var first = 
    new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1).AddMonths(-1);
var last = 
    new DateTime(DateTime.Today.Year, DateTime.Today.Month, 1).AddDays(-1);
If I am looking to improve performance, how important is it to store DateTime.Today in a variable instead of calling it multiple times? And roughly how many uses of DateTime.Today would justify creating a variable for it?

Edit: I realize I should test my program to see if there are performance problems first before worrying about something as trivial as this. For the sake of this question, assume that I have already done this and determined that additional optimization is needed.

Thanks in advance!

c#c# 
Updated on 06-Apr-2013
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1 Answers

AVADHESH PATEL

AVADHESH PATEL

06-Apr-2013
Hi Tanhuj!

10,000 DateTime.Today calls and assignment to local variable: 0.0125781 seconds.

10,000 Assignment only operations: 0.0001062 seconds.

code as given below

var sw = new Stopwatch();
DateTime date1 = DateTime.Today;
DateTime date2 = DateTime.Today;
sw.Start();
for (int i=0; i<10000; i++)
    date1 = DateTime.Today;
sw.Stop();
Debug.Print(sw.Elapsed.ToString());
sw.Reset();
sw.Start();
for (int i=0; i<10000; i++)
    date2 = date;
sw.Stop();
Debug.Print(sw.Elapsed.ToString());

I hope it resolve your problem

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