Question about Unixtime to Timestamp

[Paramount]

What about:

 

private static readonly DateTime UnixEpoch =
new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

public static long GetCurrentUnixTimestampMillis()
{
return (long) (DateTime.UtcNow - UnixEpoch).TotalMilliseconds;
}

public static DateTime DateTimeFromUnixTimestampMillis(long millis)
{
return UnixEpoch.AddMilliseconds(millis);
}

public static long GetCurrentUnixTimestampSeconds()
{
return (long) (DateTime.UtcNow - UnixEpoch).TotalSeconds;
}

public static DateTime DateTimeFromUnixTimestampSeconds(long seconds)
{
return UnixEpoch.AddSeconds(seconds);
}