C＃でUnixTimeを扱う

DateTimeの拡張メソッドを用意しておくと便利。

    public static class DateTimeExtensions 
    {
        private static readonly DateTime UNIX_EPOCH = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

        public static long ToUnixTime(this DateTime dateTime)
        {
            double nowTicks = (dateTime.ToUniversalTime() - UNIX_EPOCH).TotalSeconds;
            return (long)nowTicks;
        }        
    }