将本地时间转换为特定时区，而不考虑夏令时开启 [英] Convert Local time to a Specific timezone irrespective of Daylight is ON

问题描述

我想将本地时间转换为PST（不是PDT当前的日光）
我想有这种方法通用，所以我可以使用这个任何时区不只是太平洋。 p>

I would like to convert local time to PST (Not PDT as its Daylight on currently) And I would like to have this method generic so that I can use this for any timezone not only for Pacific.

public static DateTime ConvertDateToTimezone(DateTime givenDateTime, string timezoneId, bool considerDaylight)
{
    if (!considerDaylight)
    {
        //ToDo need to implement
        // Convert time to "timezoneId" irrespective of Daylight is on or not.
        //    var timezone =
        //       TimeZoneInfo.GetSystemTimeZones()
        //           .FirstOrDefault(x => x.Id.Equals(timezoneId));
        //    TimeZoneInfo.ConvertTimeBySystemTimeZoneId(givenDateTime, timezoneId);
    }
    return TimeZoneInfo.ConvertTimeBySystemTimeZoneId(givenDateTime, timezoneId);
}

推荐答案

那么你可以这样做：

public static DateTimeOffset ConvertToTimeZone(DateTimeOffset dto, string timeZoneId, bool considerDaylight)
{
    var timeZone = TimeZoneInfo.FindSystemTimeZoneById(timeZoneId);

    if (considerDaylight)
    {
        // this is the normal behavior
        return TimeZoneInfo.ConvertTime(dto, timeZone);
    }
    else
    {
        // the base offset doesn't include DST adjustment
        return dto.ToOffset(timeZone.BaseUtcOffset);
    }
}

但是，像Jon在问题评论中提到的，不推荐。你应该存储UTC。您真的应该回去与您的客户讨论这个问题。

However, like Jon mentioned in the question comments, this isn't recommended. You should probably be storing UTC. You really should go back and discuss this with your customer.

此外，请注意，有时，DST调整用于非DST用途，例如当时区更改其基点偏移在一年中。这种情况经常发生在美国以外。

Also, recognize that sometimes the DST adjustment is used for non-DST purposes, such as when a time zone changes its base offset in the middle of a year. This happens fairly often outside of the USA.

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