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# Timestamp in milliseconds

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I need to create the following to integrate with a system:

"Date and time expressed as the number of milliseconds elapsed since January 1, 1970 00:00:00 GMT." (assuming the time was DateTime.Now)

I have been using this:
// Timespan
DateTime d1 = new DateTime(1970, 1, 1);
DateTime d2 = DateTime.Now;
TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
sTimeStamp = ts.TotalMilliseconds.ToString();

However I am getting for example:
1139977698718.75

The system I am integrating with is expecting a whole number (i.e. no decimal points). Obviously I can trim the string I just dont understand what the decimal point is about, surely milliseconds are lowest common denominator?

Thanks
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High School Computer Science, Computer Applications, Digital Design, and Mathematics Teacher
CERTIFIED EXPERT
Top Expert 2009

Commented:

TimeSpan ts = DateTime.Now.Subtract(new DateTime(1970, 1, 1, 0, 0, 0));
String sTimeStamp = ts.TotalMilliseconds.ToString("0");
Console.WriteLine(sTimeStamp);

What an odd question though...you used Ticks in your code...and Ticks are smaller than Milliseconds!

There are 10,000 ticks per millisecond:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemtimespanclasstickspermillisecondtopic.asp
Retired
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Distinguished Expert 2017
Commented:
This one is on us!
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Commented:
Its only an odd question if you know the answer, clearly I didnt know this...
High School Computer Science, Computer Applications, Digital Design, and Mathematics Teacher
CERTIFIED EXPERT
Top Expert 2009

Commented:
You didn't like my condensed version of the code eh?   It does the same thing...

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