System.Globalization.HebrewCalendar.HebrewToGregorian C# (CSharp) Method

        DateTime HebrewToGregorian(int hebrewYear, int hebrewMonth, int hebrewDay, int hour, int minute, int second, int millisecond) {
            // Get the rough Gregorian year for the specified hebrewYear.
            //
            int gregorianYear = hebrewYear - HebrewYearOf1AD;

            __DateBuffer hebrewDateOfJan1 = new __DateBuffer(); // year value is unused.
            int lunarYearType = GetLunarMonthDay(gregorianYear, hebrewDateOfJan1);

            if ((hebrewMonth == hebrewDateOfJan1.month) && (hebrewDay == hebrewDateOfJan1.day)) {
                return (new DateTime(gregorianYear, 1, 1, hour, minute, second, millisecond));
            }

            int days = GetDayDifference(lunarYearType, hebrewMonth, hebrewDay, hebrewDateOfJan1.month, hebrewDateOfJan1.day);

            DateTime gregorianNewYear = new DateTime(gregorianYear, 1, 1);
            return (new DateTime(gregorianNewYear.Ticks + days * TicksPerDay
                + TimeToTicks(hour, minute, second, millisecond)));
        }

        /// <summary>返回一个 <see cref="T:System.DateTime" />，它设置为指定纪元中的指定日期和时间。</summary>
        /// <returns>设置为当前纪元中的指定日期和时间的 <see cref="T:System.DateTime" />。</returns>
        /// <param name="year">表示年份的整数。</param>
        /// <param name="month">1 到 13 之间的一个整数，它表示月份。</param>
        /// <param name="day">1 到 30 之间的一个整数，它表示天。</param>
        /// <param name="hour">0 与 23 之间的一个整数，它表示小时。</param>
        /// <param name="minute">0 与 59 之间的一个整数，它表示分钟。</param>
        /// <param name="second">0 与 59 之间的一个整数，它表示秒。</param>
        /// <param name="millisecond">0 与 999 之间的一个整数，它表示毫秒。</param>
        /// <param name="era">表示纪元的整数。指定 <see cref="F:System.Globalization.HebrewCalendar.HebrewEra" /> 或 HebrewCalendar.Eras[Calendar.CurrentEra]。</param>
        /// <exception cref="T:System.ArgumentOutOfRangeException">
        /// <paramref name="year" />、<paramref name="month" />、<paramref name="day" /> 或 <paramref name="era" /> 超出了当前 <see cref="T:System.Globalization.HebrewCalendar" /> 对象支持的范围。- 或 -<paramref name="hour" /> 小于 0 或大于 23。- 或 -<paramref name="minute" /> 小于 0 或大于 59。- 或 -<paramref name="second" /> 小于 0 或大于 59。- 或 -<paramref name="millisecond" /> 小于 0 或大于 999。</exception>
        public override DateTime ToDateTime(int year, int month, int day, int hour, int minute, int second, int millisecond, int era)
        {
            HebrewCalendar.CheckHebrewYearValue(year, era, "year");
            this.CheckHebrewMonthValue(year, month, era);
            this.CheckHebrewDayValue(year, month, day, era);
            DateTime gregorian = HebrewCalendar.HebrewToGregorian(year, month, day, hour, minute, second, millisecond);

            HebrewCalendar.CheckTicksRange(gregorian.Ticks);
            return(gregorian);
        }