Is date after epoch

program.cs

    /// <summary>
    /// https://en.wikipedia.org/wiki/Epoch_(reference_date)
    /// </summary>
    public static class DateTimeValidator
    {
        public static DateTime Epoch => Epoch1900;
        public readonly static DateTime Epoch1900 = new DateTime(1900, 1, 1);
        public readonly static DateTime EpochSqlDateTime = (DateTime)SqlDateTime.MinValue;

        public static bool IsValid(DateTime dateTime)
        {
            return dateTime >= Epoch;
        }
    }