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I have a database table that have date records are "dd.MM.yyyy". eg 21.05.2021
I want serialize to json file as New Date (yyyy, MM, dd)

"date": New Date (2021 , 05 , 21)

How can i do this?

What I have tried:

var jsonSettings = New JsonSerializerSettings();
jsonSettings.DateFormatString = "New Date (yyyy,MM,dd)";
String  jsonKalin  = JsonConvert.SerializeObject(dmKalin, jsonSettings);
Updated 8-Apr-21 3:55am

1 solution

That's not a valid JSON representation of a date.

Assuming you're trying to generate a Javascript snippet to construct a new Date, you need to bear in mind that the month you pass in is the month index: January = 0, February = 1, etc. So new Date(2021,5,21) represents 21st June, not 21st May.

Date() constructor - JavaScript | MDN[^]

JSON.NET has a built-in converter to generate a correct Javascript snippet for you, even though it's not technically correct JSON:
Serializing Dates in JSON[^]
var jsonSettings = new JsonSerializerSettings
    Converters =
        new Newtonsoft.Json.Converters.JavaScriptDateTimeConverter(),

string  jsonKalin = JsonConvert.SerializeObject(dmKalin, jsonSettings);
// "date": new Date(1621551600000)
The number passed to the Date constructor represents the number of milliseconds since the UNIX epoch.
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gacar 8-Apr-21 11:58am     CRLF
Thanks for solution. But returned this values [{"x":"28.09.2009","y":850.0000},{"x":"26.09.2009","y":810.0000},{"x":"27.09.2009","y":810.0000},{"x":"29.09.2009","y":810.0000},{"x":"06.10.2009","y":850.0000},{"x":"08.10.2009","y":850.0000}] I am using LinqToSQL this is my code protected void btnKAydet_Click(object sender, EventArgs e) { using (var db = new SiteChartCs.App_Start.SiteLinqDataContext()) { for (int i = 0; i <= 3; i++) { var dmKalin = db.Iron.Where(x => x.bolge_id == i + 1).Select(z => new { x = z.short_date, y = z.kalin }).ToList(); string Bolge = ""; if (i == 0) Bolge = "Location1"; if (i == 1) Bolge = "Location2"; if (i == 2) Bolge = "Location3"; if (i == 3) Bolge = "Location4"; var jsonSettings = new JsonSerializerSettings { Converters = { new Newtonsoft.Json.Converters.JavaScriptDateTimeConverter(), }, }; // "date": new Date(1621551600000) string jsonKalin = JsonConvert.SerializeObject(dmKalin, jsonSettings); File.WriteAllText(Server.MapPath("~/Content/Chart/iron/" + Bolge + "KalinTum.json"), jsonKalin); } } }
Richard Deeming 8-Apr-21 12:44pm     CRLF
Then z.short_date is not a valid DateTime value. Don't store dates as strings; use a proper date data-type.
gacar 8-Apr-21 13:09pm    
Yes thanks, worked now. But how can i convert to miliseconds to date?

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