[英]What is the best way to store DateTime into cookies?
I am working on an ASP .NET project, and currently I am using this code to store and retrieve DateTime on cookies: 我正在开发一个ASP .NET项目,目前我正在使用此代码在cookie上存储和检索DateTime:
HttpCookie cookie = new HttpCookie("myCookie");
if (Request.Cookies["myCookie"] != null)
{
cookie = Request.Cookies["myCookie"];
}
else
{
cookie["From"] = DateTime.Now.AddDays(-7).ToShortDateString();
cookie["To"] = DateTime.Now.ToShortDateString();
Response.Cookies.Add(cookie);
}
model.FromDate = DateTime.Parse(cookie["From"]);
model.ToDate = DateTime.Parse(cookie["To"]);
And in my View I am using Razor to recovery the model values like this: 在我的视图中,我使用Razor恢复模型值,如下所示:
<input type="text" id="from" value="@Model.FromDate.ToShortDateString()" readonly="readonly" />
<input type="text" id="to" value="@Model.ToDate.ToShortDateString()" readonly="readonly" />
It is working fine when I run it locally, but when I uploaded to production, when recovering the DateTime from cookie, the date is changed in one day. 当我在本地运行它时工作正常,但是当我上传到生产时,从cookie恢复DateTime时,日期会在一天内更改。 For example, I selected a date range from 3/25/2016 to 4/1/2016, then I have gone to another page, and when I came back to this page, the page showed a date range from 3/24/2016 to 3/31/2016, decreased in one day. 例如,我选择了从2016年3月25日到2016年4月1日的日期范围,然后我又转到了另一页,当我回到此页面时,页面显示的日期范围是2016年3月24日到2016年3月31日,一天减少。
Do you know what I am doing wrong here, why this just happens in production (I suppose is something related to server date) and, finally, what is the best way to store and retrieve a DateTime on cookie? 你知道我在这里做错了什么,为什么这只是在生产中发生(我想是与服务器日期相关的东西),最后,什么是在cookie上存储和检索DateTime的最佳方法?
You can store the date in Ticks 您可以将日期存储在Ticks中
cookie["From"] = DateTime.Now.AddDays(-7).Ticks.ToString();
cookie["To"] = DateTime.Now.Ticks.ToString();
and recover like this: 并像这样恢复:
model.FromDate = new DateTime(Convert.ToInt64(cookie["From"]));
model.ToDate = new DateTime(Convert.ToInt64(cookie["To"]));
Hope this helps you 希望这对你有所帮助
When storing date / time as string
you should always consider timezones. 将日期/时间存储为string
您应始终考虑时区。 I recommend you to use DateTimeOffset
instead of DateTime
: 我建议你使用DateTimeOffset
而不是DateTime
:
var now = DateTimeOffset.Now;
var asString = now.ToString(CultureInfo.InvariantCulture);
var asDatetimeOffset = DateTimeOffset.Parse(asString, CultureInfo.InvariantCulture);
The string looks like this: 04/01/2016 22:01:09 +02:00
字符串看起来像这样: 04/01/2016 22:01:09 +02:00
(You need to know the client's timezone to correctly calculate its 'local' time. In your example, the server uses it's own time.) (您需要知道客户端的时区才能正确计算其“本地”时间。在您的示例中,服务器使用它自己的时间。)
The result of DateTime.Parse(cookie["From"]);
DateTime.Parse(cookie["From"]);
的结果DateTime.Parse(cookie["From"]);
is set to DateTimeKind.Unspecified
. 设置为DateTimeKind.Unspecified
。 Any further operation (like AddDays) depends the system's timezone. 任何进一步的操作(如AddDays)都取决于系统的时区。
I think you should specify the culture and tell the parser which DateTimeKind
to expect: 我认为你应该指定文化并告诉解析器期望DateTimeKind
:
model.FromDate = DateTime.Parse(cookie["From"], CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal);
model.ToDate = DateTime.Parse(cookie["To"], CultureInfo.CurrentCulture, DateTimeStyles.AssumeLocal);
Note : DateTime.ToShortDateString isn't a good choice, since it is defined by the current culture's DateTimeFormatInfo object. 注意 :DateTime.ToShortDateString不是一个好的选择,因为它是由当前文化的DateTimeFormatInfo对象定义的。
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