How can I convert a Unix timestamp to DateTime and vice versa?

Question

There is this example code, but then it starts talking about millisecond / nanosecond problems.

The same question is on MSDN, Seconds since the Unix epoch in C#.

This is what I've got so far:

public Double CreatedEpoch {   get   {     DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();     TimeSpan span = (this.Created.ToLocalTime() - epoch);     return span.TotalSeconds;   }   set   {     DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();     this.Created = epoch.AddSeconds(value);   } } 

Answer 1

Here's what you need:

public static DateTime UnixTimeStampToDateTime( double unixTimeStamp ) {     // Unix timestamp is seconds past epoch     DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);     dateTime = dateTime.AddSeconds( unixTimeStamp ).ToLocalTime();     return dateTime; } 

Or, for Java (which is different because the timestamp is in milliseconds, not seconds):

public static DateTime JavaTimeStampToDateTime( double javaTimeStamp ) {     // Java timestamp is milliseconds past epoch     DateTime dateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);     dateTime = dateTime.AddMilliseconds( javaTimeStamp ).ToLocalTime();     return dateTime; }