asked on

Timestamp in milliseconds

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."

How would I do this assuming the time was DateTime.Now?

Thanks

ASKER CERTIFIED SOLUTION

amit_g

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

jonnyboy69

ASKER

Doesnt seem to be giving me the results I expected. For example I just did it and got 640. There have clearly ben more milliseconds than that from 1970?

string sTimeSpan = "";
                  DateTime d1 = new DateTime(1970, 1, 1);
                  DateTime d2 = DateTime.UtcNow;
                  TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
                  sTimeSpan = ts.Milliseconds.ToString();

jonnyboy69

ASKER

Actually got it thanks, needed: ts.TotalMilliseconds

jonnyboy69

ASKER

Hmm this is giving me incorrect results actualy

// Timespan
DateTime d1 = new DateTime(1970, 1, 1);
DateTime d2 = DateTime.Now;
TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);
sTimeStamp = ts.TotalMilliseconds.ToString();

I am getting for example:
1139977698718.75

Dont unerstand what the decimal point is about, surely milliseconds are lowest common denominator?

Thanks

amit_g

The smallest unit of time is the tick, which is equal to 100 nanoseconds. That is why wne you convert to milliseconds, decimal gets in.