wabbajack/Wabbajack.Common/TimeExtensions.cs

using System;

namespace Wabbajack.Common
{
    public static class TimeExtensions
    {
        public static DateTime AsUnixTime(this long timestamp)
        {
            var dtDateTime = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            dtDateTime = dtDateTime.AddSeconds(timestamp);
            return dtDateTime;
        }

        public static ulong AsUnixTime(this DateTime timestamp)
        {
            var diff = timestamp - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
            return (ulong)diff.TotalSeconds;
        }
    }
}