C# version of Javascript Date.getTime()

Question

What is the best way in c# to get the same result of javascript date.gettime() call?

The getTime() method returns the number of milliseconds since midnigh

Answer 1

Here is an extension method based off Enigma State's answer

public static Int64 GetJavascriptTimeStamp(this DateTime dt)
{
    var nineteenseventy = new DateTime(1970, 1, 1);
    var timeElapsed = (dt.ToUniversalTime() - nineteenseventy);
    return (Int64)(timeElapsed.TotalMilliseconds + 0.5);
}

To use it for the current time:

var timeStamp = DateTime.Now.GetJavascriptTimeStamp();