C# 如何在特定时区转换日期时间？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9869051/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How to convert DateTime in Specific timezone?
提问by fiberOptics
I find it hard to understand how UTC works.
我发现很难理解 UTC 是如何工作的。
I have to do the following but I'm still confused if I'd get the right result.
我必须执行以下操作，但如果我得到正确的结果，我仍然感到困惑。
Objectives:
目标：
- Ensure all saved dates in Database are in UTC format
- Update DefaultTimezone is in Manila time
- Ensure all returned dates are in Manila Time
- 确保数据库中所有保存的日期都是 UTC 格式
- 更新 DefaultTimezone 是在马尼拉时间
- 确保所有返回的日期都在马尼拉时间
So the code is:
所以代码是：
public ConvertDate(DateTime? dateTime)
{
if (dateTime != null)
{
Value = (DateTime)dateTime;
TimeZone = GetFromConfig.DefaultTimeZone();
}
}
public ConvertDate(DateTime? dateTime, int GMTTimeZone)
{
if (dateTime != null)
{
Value = (DateTime)dateTime;
TimeZone = GMTTimeZone;
}
}
public int TimeZone
{
get { return m_TimeZone; }
set { m_TimeZone = value; }
}
DateTime m_Value;
public DateTime Value
{
get { return m_Value; }
set
{
m_Value = value;
DateTime converted = m_Value.ToUniversalTime().ToLocalTime();
}
}
Sample usage:
示例用法：
DateTime SampleInputFromUser = new DateTime(2012, 1, 22);
ConvertDate newConversion = new ConvertDate(SampleInputFromUser, 21);
DateTime answer = newConversion.Value;
Now I get confused for 'TimeZone'. I don't know how to use it to get the objectives.
Hope you understand my question and have the idea to get the objectives done.
现在我对“时区”感到困惑。我不知道如何使用它来实现目标。
希望您理解我的问题并有完成目标的想法。
Edit
编辑
According to @raveturned answer, I get this following code:
根据@raveturned 的回答，我得到以下代码：
***Added in ConvertDate method
***在 ConvertDate 方法中添加
TimeZoneInfo timeInfo = TimeZoneInfo.FindSystemTimeZoneById(GetFromConfig.ManilaTimeZoneKey());
ManilaTime = TimeZoneInfo.ConvertTime(dateTime.Value, TimeZoneInfo.Local, timeInfo).ToUniversalTime();
**New Property
**新物业
DateTime _ManilaTime;
public DateTime ManilaTime
{
get { return _ManilaTime; }
set { _ManilaTime = value; }
}
采纳答案by raveturned
The .NET framework already has classes and methods available to convert DateTimes between different time zones. Have a look at the ConvertTime methods of the TimeZoneInfoclass.
.NET 框架已经提供了可用于在不同时区之间转换 DateTime 的类和方法。查看TimeZoneInfo类的 ConvertTime 方法。
Edit:When you get the time to put into the database, assuming it was created with correct time zone information you can easily convert to UTC:
编辑：当您有时间放入数据库时，假设它是使用正确的时区信息创建的，您可以轻松转换为 UTC：
DateTime utcTime = inputDateTime.ToUniversalTime();
Get timeInfo as done in the question edit:
在问题编辑中获取 timeInfo：
TimeZoneInfo timeInfo = TimeZoneInfo.FindSystemTimeZoneById(GetFromConfig.ManilaTimeZoneKey());
When you send the database time to user, convert it to the correct timezone using timeInfo.
当您将数据库时间发送给用户时，请使用 将其转换为正确的时区timeInfo。
DateTime userTime = TimeZoneInfo.ConvertTimeFromUtc(dbDateTime, timeInfo);
Personally I'd try and keep this logic separate from the propery get/set methods.
我个人会尝试将此逻辑与属性 get/set 方法分开。
回答by Roger Tello
TimeZoneInfo infotime = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time (Mexico)");
DateTime thisDate = TimeZoneInfo.ConvertTimeFromUtc(datetimeFromBD, infotime);
回答by user3761555
To help others:
帮助他人：
static void ChangeTimezone()
{
// Timezone string here:
foreach (TimeZoneInfo z in TimeZoneInfo.GetSystemTimeZones())
Console.WriteLine(z.Id);
// Use one of those timezone strings
DateTime localDt = DateTime.Today;
DateTime utcTime = localDt.ToUniversalTime();
TimeZoneInfo timeInfo = TimeZoneInfo.FindSystemTimeZoneById("US Eastern Standard Time");
DateTime estDt = TimeZoneInfo.ConvertTimeFromUtc(utcTime, timeInfo);
return;
}
回答by Kevin
var date = System.TimeZoneInfo.ConvertTimeFromUtc(
DateTime.UtcNow,
TimeZoneInfo.FindSystemTimeZoneById("Pacific Standard Time"));
