DateTime to epoch conversions for C#, UTC

gistfile1.cs

using System;

namespace YourChoice
{
    public static class TimeHelpers
    {
        public static DateTime FromEpochTime(this long unixTime)
        {
            var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
            return epoch.AddSeconds(unixTime);
        }

        public static long ToEpochTime(this DateTime date)
        {
            return (date.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
        }
    }
}