Question

无论是8月还是2月，我都必须始终用太平洋时间给我的数据库盖章。太平洋时间是一年中任何时候的美国西海岸实际时间：

夏令时PT = PDT（太平洋夏令时）= UTC-7
在非夏时制时间PT = PST（太平洋标准时间0 = UTC-8

我正在使用C＃并执行以下操作：

TimeZoneInfo pacificZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
CreatedDate = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, pacificZone);

是否会自动考虑夏令时，还是我需要通过以下方式对此加以考虑：

TimeZoneInfo pacificZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
CreatedDate = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, pacificZone);
if (!TimeZoneInfo.Local.IsDaylightSavingTime(CreatedDate))
{
       CreatedDate = CreatedDate.AddHours(-1);
}

Answer 1

我的第一个或第二个代码段正确吗？

第一个块是正确的。

测试代码

var utcDateDuringDaylightSavingsTime = new DateTime(2018, 7, 1, 15, 30, 30, DateTimeKind.Utc);
TimeZoneInfo pacificZone = TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time");
var localDateDuringDaylightSavingsTime = TimeZoneInfo.ConvertTimeFromUtc(utcDateDuringDaylightSavingsTime, pacificZone);
var localDateNotDuringDaylightSavingsTime = TimeZoneInfo.ConvertTimeFromUtc(utcDateDuringDaylightSavingsTime.AddMonths(5), pacificZone);

Console.WriteLine(utcDateDuringDaylightSavingsTime.ToString("o") + "\t\tUTC");
Console.WriteLine(localDateDuringDaylightSavingsTime.ToString("o") + "\t\t Local during daylight saving");
Console.WriteLine(localDateNotDuringDaylightSavingsTime.ToString("o") + "\t\t Local not during daylight saving");

输出

2018-07-01T15:30:30.0000000Z        UTC
2018-07-01T08:30:30.0000000         Local during daylight saving
2018-12-01T07:30:30.0000000         Local not during daylight saving

C＃中的太平洋时间，不考虑夏令时

1 个答案:

测试代码