new Date().getTime() in .NET

Question

Basically i want to do the below in .NET but i have no idea how to.

var d = new Date().getTime() + " milliseconds since 1970/01/01"

Answer 1

I'm not really sure you can get a UNIX date in .NET, but you have DateTime.Now as an equvivalent of new Date() (or new DateTime())

As you got in the comment, it's possible to get a TimeSpan object by doning something in the lines of...

(First answer)

DateTime.Now.Subtract(new DateTime(1970,1,1)).TotalMilliseconds

Adding the final result for the sake of mankind...

var d = DateTime.Now.Subtract(new DateTime(1970,1,1).ToUniversalTime()).TotalMilliseconds + " milliseconds since 1970/01/01";

P.S. Where is Jon Skeet with his knowledge of time when we need him :P

Answer 2

You'd do something like this...

var ts = DateTime.UtcNow - new DateTime(1970,1,1);
var result = String.Format("{0} milliseconds since 1970/01/01", ts.TotalMilliseconds);

Answer 3

I wrote an extension method for myself a while back.

It's used like so:

 double ticks = DateTime.UtcNow.UnixTicks();

Implementation:

 public static class ExtensionMethods
 {
  // returns the number of milliseconds since Jan 1, 1970 
                // (useful for converting C# dates to JS dates)
  public static double UnixTicks(this DateTime dt)
  {
   DateTime d1 = new DateTime(1970, 1, 1);
   DateTime d2 = dt.ToUniversalTime();
   TimeSpan ts = new TimeSpan(d2.Ticks - d1.Ticks);

   return ts.TotalMilliseconds;
  }
 }

Answer 4

Subtraction is the way to do it, but all the responses I've seen so far do not correctly adjust for UTC.

You want something like:

var ts = DateTime.UtcNow - new DateTime(1970,1,1,0,0,0,DateTimeKind.Utc); 
var result = String.Format("{0} milliseconds since 1970/01/01", ts.TotalMilliseconds);

Answer 5

You can get there via the DateTime and TimeSpan structures via DateTime.Subtract, something like:

TimeSpan ts = DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1));
ts.TotalMilliseconds; // ...since The Epoch

Answer 6

How about

var s = string.format("{0}  milliseconds since 1970/01/01",
           (DateTime.Now - DateTime.Parse("1970/01/01")).TotalMilliseconds);

Answer 7

I was fooling around and saw this example, but ended up modifying it to this:

var st = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).ToFileTimeUtc();
            var t = (DateTime.UtcNow.ToFileTimeUtc());
            Debug.WriteLine(t - st);

Will give a number like 16202########

Answer 8

DateTime dt = new DateTime();
dt = DateTime.Now;
TimeSpan dtNow = new TimeSpan();
dtNow = dt.Subtract(new DateTime(1970, 1, 1));
Console.WriteLine(dtNow.TotalMilliseconds);

Bit long-winded in comparison to others, but it works.