UnixDate.cs

UnixDate.cs

public static class UnixDateTime
    {
        public static DateTimeOffset FromUnixTimeSeconds(long seconds)
        {
            if (seconds < -62135596800L || seconds > 253402300799L)
                throw new ArgumentOutOfRangeException("seconds", seconds, "");

            return new DateTimeOffset(seconds * 10000000L + 621355968000000000L, TimeSpan.Zero);
        }

        public static DateTimeOffset FromUnixTimeMilliseconds(long milliseconds)
        {
            if (milliseconds < -62135596800000L || milliseconds > 253402300799999L)
                throw new ArgumentOutOfRangeException("milliseconds", milliseconds, "");

            return new DateTimeOffset(milliseconds * 10000L + 621355968000000000L, TimeSpan.Zero);
        }

        public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
        {
            DateTime datetime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddSeconds(unixTimeStamp).ToLocalTime();
            return datetime;
        }

        public static long ToUnixTimeSeconds(this DateTimeOffset utcDateTime)
        {
            return utcDateTime.Ticks / 10000000L - 62135596800L;
        }

        public static long ToUnixTimeMilliseconds(this DateTimeOffset utcDateTime)
        {
            return utcDateTime.Ticks / 10000L - 62135596800000L;
        }
    }