DateTimeUtil

namespace System {
    internal sealed class DateTimeUtil {
        private const long FileTimeOffset = 504911232000000000L;

        private readonly static DateTime MaxValueMinusOneDay;

        private readonly static DateTime MinValuePlusOneDay;

        static DateTimeUtil() {
            DateTime minValue = DateTime.MinValue;
            DateTimeUtil.MinValuePlusOneDay = minValue.AddDays(1);
            DateTime maxValue = DateTime.MaxValue;
            DateTimeUtil.MaxValueMinusOneDay = maxValue.AddDays(-1);
        }

        private DateTimeUtil() {
        }

        internal static DateTime ConvertToLocalTime(DateTime utcTime) {
            if(utcTime < DateTimeUtil.MinValuePlusOneDay) {
                return DateTime.MinValue;
            }
            if(utcTime > DateTimeUtil.MaxValueMinusOneDay) {
                return DateTime.MaxValue;
            }
            return utcTime.ToLocalTime();
        }

        internal static DateTime ConvertToUniversalTime(DateTime localTime) {
            if(localTime < DateTimeUtil.MinValuePlusOneDay) {
                return DateTime.MinValue;
            }
            if(localTime > DateTimeUtil.MaxValueMinusOneDay) {
                return DateTime.MaxValue;
            }
            return localTime.ToUniversalTime();
        }

        internal static DateTime FromFileTimeToUtc(long filetime) {
            long num = filetime + 504911232000000000L;
            return new DateTime(num,DateTimeKind.Utc);
        }
    }

}