How should I convert timestamp in unity, which is a double, in a webserver-like BIGINT number ?

For future searchers! This is how you get time as timestamp in Unity:

 long time = new DateTimeOffset(DateTime.Now).ToUnixTimeSeconds();

It will give you something like this: 1563280100.

Tested in Unity 2019

This page may help: http://msdn.microsoft.com/en-us/library/system.datetime.aspx Also http://answers.unity3d.com/questions/44415/how-to-get-real-time.html

I try to be more specific.

Talking about a mobile App, that need to retrieve the geographical position from GPS.

Asking the timestamp to GPS locationInfo with Unity built-in new commands (Unity Android Pro version 3.4) I get this kind of numbers:

-9.62146447728842E-24

But I think there is no convertion algorithm around to convert this DOUBLE into a BIG INT usual UNIX TIMESTAMP.

What Am I missing ?

Please try this:

 private double ConvertToTimestamp(DateTime value)
 {
     //create Timespan by subtracting the value provided from
     //the Unix Epoch
     TimeSpan span = (value - new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime());
 
     //return the total seconds (which is a UNIX timestamp)
     return (double)span.TotalSeconds;
 }

I did that and is working;

 private double ConvertToToTimestamp(System.DateTime value)
     {
         double timeStamp = (System.DateTime.UtcNow - value).TotalSeconds; 
         return timeStamp;
     }