Question

嘿，我有一个TimeZoneInfo对象，我想创建一个TIME_ZONE_INFO结构。

偏见，StandardDate和Daylightdate非常容易获得。但是，我在获取standardbias和daylightbias方面遇到了问题。所以问题是，如何从TimeZOneInfo对象中获取标准偏差？如何为日光灯获取相同的东西（有一个AdjustmentRule.DaylightDelta，但正如您所见，我需要偏移而不是delta）。

感谢。

Answer 1

我将此代码与使用CrankedUp（读取TIME_ZONE_INFORMATION）的结果进行了比较，结果在我的Windows XP sp3计算机上相同。您的结果可能会有所不同。

TimeZoneInfo.AdjustmentRule[] adjustmentRules = timeZoneInfo.GetAdjustmentRules();
TimeZoneInfo.AdjustmentRule adjustmentRule = null;
if (adjustmentRules.Length > 0)
{
    // Find the single record that encompasses today's date. If none exists, sets adjustmentRule to null.
    adjustmentRule = adjustmentRules.SingleOrDefault(ar => ar.DateStart <= DateTime.Now && DateTime.Now <= ar.DateEnd);
}

double bias = -timeZoneInfo.BaseUtcOffset.TotalMinutes; // I'm not sure why this number needs to be negated, but it does.
string daylightName = timeZoneInfo.DaylightName;
string standardName = timeZoneInfo.StandardName;
double daylightBias = adjustmentRule == null ? -60 : -adjustmentRule.DaylightDelta.TotalMinutes; // Not sure why default is -60, or why this number needs to be negated, but it does.
int daylightDay = 0;
int daylightDayOfWeek = 0;
int daylightHour = 0;
int daylightMonth = 0;
int standardDay = 0;
int standardDayOfWeek = 0;
int standardHour = 0;
int standardMonth = 0;

if (adjustmentRule != null)
{
    TimeZoneInfo.TransitionTime daylightTime = adjustmentRule.DaylightTransitionStart;
    TimeZoneInfo.TransitionTime standardTime = adjustmentRule.DaylightTransitionEnd;

    // Valid values depend on IsFixedDateRule: http://msdn.microsoft.com/en-us/library/system.timezoneinfo.transitiontime.isfixeddaterule.
    daylightDay = daylightTime.IsFixedDateRule ? daylightTime.Day : daylightTime.Week;
    daylightDayOfWeek = daylightTime.IsFixedDateRule ? -1 : (int)daylightTime.DayOfWeek;
    daylightHour = daylightTime.TimeOfDay.Hour;
    daylightMonth = daylightTime.Month;

    standardDay = standardTime.IsFixedDateRule ? standardTime.Day : standardTime.Week;
    standardDayOfWeek = standardTime.IsFixedDateRule ? -1 : (int)standardTime.DayOfWeek;
    standardHour = standardTime.TimeOfDay.Hour;
    standardMonth = standardTime.Month;
}

Answer 2

TIME_ZONE_INFORMATION帮助非常有用。它表示大多数时区的标准偏差为0。对我来说，拥有标准偏差非零的时区并没有多大意义。这不是“标准”的意思吗？

DaylightDelta是标准UTC偏移和日光UTC偏移之间的差异。 DaylightBias的定义方式相同，因此您的DaylightDelta是您的DaylightBias。

我现在无法解决这个问题，但我建议您使用时区中的数据。或者，有没有办法可以使用Win32对象获取 TIME_ZONE_INFORMATION结构来获取相应的TimeZoneInfo，而不是创建对象？通过在DYNAMIC_TIME_ZONE_INFORMATION.StandardName中指定TimeZoneInfo.StandardName来获取GetTimeZoneInformationForYear之类的内容？

TimeZoneInfo到TIME_ZONE_INFORMATION结构

2 个答案: