Convert to and from Epoch

EpochConversion

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

    public static DateTime UnixTimeToDateTime(string text)
    {
        double seconds = double.Parse(text, CultureInfo.InvariantCulture);
        var time = Epoch.AddSeconds(seconds);

        return time;
    }

    public static double DateTimeToUnixTime(DateTime date)
    {
        TimeSpan diff = date - Epoch;
        return Math.Floor(diff.TotalSeconds);
    }
}