csharp convert timestamp to datetime

                
                        DateTime authTimeUtc = DateTimeOffset.FromUnixTimeMilliseconds(long.Parse(filteredAuthUserClaims.AuthTimestamp)).DateTime;
                    
                

csharp convert Unix time in seconds to datetime

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

csharp datetime to timestamp

                        
                                DateTimeOffset.UtcNow.ToUnixTimeSeconds()
                            
                        

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