Newtonsoft.Json/Utilities/DateTimeUtils.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.IO;
using System.Xml;
using System.Globalization;

namespace Newtonsoft.Json.Utilities
{
    internal static class DateTimeUtils
    {
        internal static readonly long InitialJavaScriptDateTicks = 621355968000000000;

        private const int DaysPer100Years = 36524;
        private const int DaysPer400Years = 146097;
        private const int DaysPer4Years = 1461;
        private const int DaysPerYear = 365;
        private const long TicksPerDay = 864000000000L;
        private static readonly int[] DaysToMonth365;
        private static readonly int[] DaysToMonth366;

        static DateTimeUtils()
        {
            DaysToMonth365 = new[] { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
            DaysToMonth366 = new[] { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 };
        }

        public static TimeSpan GetUtcOffset(this DateTime d)
        {
#if NET20
      return TimeZone.CurrentTimeZone.GetUtcOffset(d);
#else
            return TimeZoneInfo.Local.GetUtcOffset(d);
#endif
        }

#if !(NETFX_CORE || PORTABLE40 || PORTABLE)