using static System.Console;
public static void Main() {
WriteLine(DateTime.Now.ToTimestamp());
public static class DateTimeExt {
public static readonly DateTime TimeStampStart = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
public static long ToTimestamp(this DateTime value) {
return (long)(value - TimeStampStart).TotalSeconds;