無法DateTime值轉換爲UTC

我試圖從數據庫中提取數據，並使用C＃無法DateTime值轉換爲UTC

我已經試過這一點，這是行不通的日期時間值轉換爲UTC。

foreach (GrJscMstr gjm in grJscMstrs) 
       { 
        gjm.gr_sch_date = DateTime.SpecifyKind(gjm.gr_sch_date, DateTimeKind.Utc); 
       }

然後，我想這一點，這也是不工作：

foreach (GrJscMstr gjm in grJscMstrs) 
       { 
        gjm.gr_sch_date = new DateTime(gjm.gr_sch_date.Year, gjm.gr_sch_date.Month, gjm.gr_sch_date.Day, 0, 0, 0, DateTimeKind.Utc); 
       }

然後我修改了代碼，這裏面是工作的罰款。

foreach (GrJscMstr gjm in grJscMstrs) 
       { 
        gjm.gr_sch_date = new DateTime(gjm.gr_sch_date.Year, gjm.gr_sch_date.Month, gjm.gr_sch_date.Day, 0, 0, **1**, DateTimeKind.Utc); 
       }

我需要知道爲什麼。這對我沒有任何意義。 DateTime.SpecifyKind(gjm.gr_sch_date, DateTimeKind.Utc);應該工作正常。

來源

2016-12-08 Lonely Planeteer

是什麼類型gr_sch_date？ – CodingYoshi

gjm.gr_sch_date是本地時區中的DateTime值嗎？如果是這樣，請嘗試使用'TimeZoneInfo.ConvertTimeToUtc（DateTime.SpecifyKind（gjm.gr_sch_date.Date，DateTimeKind.Local））'。如果未指定日期，請使用「DateTimeKind.Unspecified」。如果您只是將時區重新配置爲UTC，AFAIK，則「DateTime.SpecifyKind（gjm.gr_sch_date，DateTimeKind.Utc）'轉換爲UTC，而不使用時區差異。 –

那些命名變量和類。 – Kinetic

孤獨Planeteer沒有明確規定什麼是「不工作」的意思。以下示例演示瞭如何通過使用Lonely Planeteer所需的語法鬆散地改變DateTime的種類。也許這個完整的工作例子將允許Lonely Planeteer找到問題。

using System; 

namespace StOv3 
{ 
    class Program 
    { 
     static void Main(string[] args) 
     { 
      DateTime unspecifiedTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Unspecified); 
      DateTime localTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Local); 
      DateTime utcTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Utc); 
      Console.WriteLine("A DateTime, unspecified whether UTC or local {0}, Kind {1}", unspecifiedTime, unspecifiedTime.Kind); 
      Console.WriteLine("A local DateTime {0}, Kind {1}", localTime, localTime.Kind); 
      Console.WriteLine("A UTC DateTime {0}, Kind {1}", utcTime, utcTime.Kind); 
      // Attempt to redefine variables with same values; 

      unspecifiedTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Unspecified); 
      localTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Local); 
      utcTime = new DateTime(2016, 12, 8, 0, 0, 0, DateTimeKind.Utc); 
      Console.WriteLine("A DateTime, unspecified whether UTC or local {0}, Kind {1}", unspecifiedTime, unspecifiedTime.Kind); 
      Console.WriteLine("A local DateTime {0}, Kind {1}", localTime, localTime.Kind); 
      Console.WriteLine("A UTC DateTime {0}, Kind {1}", utcTime, utcTime.Kind); 

      // Attempt to change kind of variable 

      unspecifiedTime = DateTime.SpecifyKind(unspecifiedTime, DateTimeKind.Utc); 
      localTime = DateTime.SpecifyKind(localTime, DateTimeKind.Unspecified); 
      utcTime = DateTime.SpecifyKind(utcTime, DateTimeKind.Utc); 
      Console.WriteLine("A DateTime, originally unspecified whether UTC or local {0}, Kind {1}", 
       unspecifiedTime, unspecifiedTime.Kind); 
      Console.WriteLine("A DateTime, originally local {0}, Kind {1}", localTime, localTime.Kind); 
      Console.WriteLine("A DateTime, originally UTC {0}, Kind {1}", utcTime, utcTime.Kind); 

     } 
    } 
}

控制檯輸出：

 
A DateTime, unspecified whether UTC or local 12/8/2016 00:00:00, Kind Unspecified 
A local DateTime 12/8/2016 00:00:00, Kind Local 
A UTC DateTime 12/8/2016 00:00:00, Kind Utc 
A DateTime, unspecified whether UTC or local 12/8/2016 00:00:00, Kind Unspecified 
A local DateTime 12/8/2016 00:00:00, Kind Local 
A UTC DateTime 12/8/2016 00:00:00, Kind Utc 
A DateTime, originally unspecified whether UTC or local 12/8/2016 00:00:00, Kind Utc 
A DateTime, originally local 12/8/2016 00:00:00, Kind Unspecified 
A DateTime, originally UTC 12/8/2016 00:00:00, Kind Utc

來源

2016-12-08 17:02:26

無法DateTime值轉換爲UTC

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