c# - JSの日付をC＃のDateTimeに解析します

Question

「TueSep042012B0100（GMT DaylightTime）」という形式の日付文字列を提供するjavascriptdateオブジェクトがあります。

ここで説明したようにParseEaxcatで解析しようとしていますが、無効な日付例外がスローされます-誰かが正しい形式の方向に私を向けます

                string date = "Tue Sep 04 2012B0100 (GMT Daylight Time)";
                dt = DateTime.ParseExact(date,"ddd MMM dd yyyyBzzzz",
                     CultureInfo.InvariantCulture);

私もこれを喜んで見ました：http： //msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

score 8 · Accepted Answer

If you can (and it sounds like you do since you have the object), I'd recommend extracting the number of milliseconds since 1970/01/01 from Javascript (.getTime()), convert it to .Net ticks (100-nanosecond units), and use that to parse into a C# DateTime.

var ticks = (jsMillis * 10000) + 621355968000000000;
var date = new DateTime(ticks);

where jsMillis is the number you get from calling getTime() on the Javascript DateTime object.

The 621355968000000000 is to convert from C#'s date origin (Midnight Jan 1, 0001) to javascript's date origin.

score 3 · Accepted Answer

This works. Though, you may want to strip the GMT Daylight Time portion out before passing it in just to avoid the in-line split.

string date = "Tue Sep 04 2012B0100 (GMT Daylight Time)";
var dt = DateTime.ParseExact(date.Split('(')[0].Replace("B","+").Trim(), "ddd MMM dd yyyyzzz", CultureInfo.InvariantCulture);

Edited to account for the offset.

score 3 · Accepted Answer

I'm getting a different date time format from JavaScript. Here is what I had to do:

public void Main()
{
    Console.WriteLine(
        ConvertJsDate("Fri Apr 18 2014 16:23:18 GMT-0500 (Central Daylight Time)"));
    //test more regular date
    Console.WriteLine(
        ConvertJsDate("4/18/2014 16:23:18")); 
}

public DateTime ConvertJsDate(string jsDate)
{
    string formatString = "ddd MMM d yyyy HH:mm:ss";

    var gmtIndex = jsDate.IndexOf(" GMT");
    if (gmtIndex > -1) 
    {
        jsDate = jsDate.Remove(gmtIndex);
        return DateTime.ParseExact(jsDate, formatString, null);
    }
    return DateTime.Parse(jsDate);
}

score 0 · Accepted Answer

The date doesn't appear to match the format string. The format string has hyphens, and is missing the parenthesized section. Also, there is no mention of a format string with 4 z's, so you might change the first one to a 0.

score 0 · Accepted Answer

Alternative approach is to convert date into reasonable representation on JavaScript side will be significantly more robust: no need to guess language server side, may handle timezones correctly.

If you use some sort of automated conversion (i.e. JSON.stringify) you may need to add one more field parallel to your date field with string representation of the same value and use it on server side instead of original one.

{ dateFied: new Date(),
  dateFiledAsIsoString: "....." }

If decided to go this route consider also passing Time Zone (time offset) to server side code or converting time to UTC on JavaScript side. Consider using ISO8601 format for date: yyyy-MM-ddTHH:mm:ss.fffffffzzz.

score 0 · Accepted Answer

There are a lot of ways to do this... But this is what I find to be the simplest...

// JavaScript
var d = new Date();
d.toLocaleString();
// =>   "6/26/2015, 2:07:25 PM"

// Can be Parsed by the C# DateTime Class
DateTime d = DateTime.Parse( @"6/26/2015, 2:07:25 PM" );
Console.WriteLine( d.ToLongDateString() );
// =>   Friday, June 26, 2015

c# - JSの日付をC＃のDateTimeに解析します

6 に答える 6

Related

Reference