parsing the date object in javascript

Question

Date.parseWeird=Date.prototype.parseWeird=function(d)
{
    return new Date(Date.parse(d));
};

var d = /Date(-65424600000)/

How can i parse this date and show in MM/DD/YY format.

16/09/1956

I'm not really understanding the question here. Are you trying to parse the negative number as a Date? — Pat
– Pat, Commented Jul 20, 2011 at 13:33
@John: Many of your questions have a negative score. It may be worth looking at some higher-scored questions to see how it's done! — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Jul 20, 2011 at 13:38
@Tomalak Gerek'kal: Can't help if someone marks a negative score, no one really understands that if someone is not able to explain properly... they give negative stuffs... i am learning... i am editing the question back — John Cooper
– John Cooper, Commented Jul 20, 2011 at 13:40
That is the format from a JSON string from .NET. I'm assuming it is supposed to be a string. Also, the negative number is the time since UNIX Epoch but not going forward from 1970 but backwards from 1970 — Joe
– Joe, Commented Jul 20, 2011 at 13:42

Joe · Accepted Answer · 2011-07-20 13:49:05Z

2

I remove the extra:

Date.parseWeird=Date.prototype.parseWeird=function(d)
{
    return new Date(parseInt(/-?\d+/.exec(d)[0], 10));
};

var x = Date.parseWeird('/Date(-65424600000)/');
alert((x.getMonth()+1) + "/" + x.getDate() + "/" + x.getFullYear());

The express is looking for 0 or 1, ?, negative sign, followed by any number, + , of digits, \d.

edited Jul 20, 2011 at 13:49

answered Jul 20, 2011 at 13:35

Joe

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5 Comments

John Cooper Over a year ago

Thanks... for this code.. can u explain me the regular experssion a little bit and what does exec do

Alex K. Over a year ago

Don't forget x.getMonth() + 1

Joe Over a year ago

John I've explained the expression. @Alex, thank you for pointing that out. I always forget that.

mplungjan Over a year ago

I think my regex is easier to understand, no? d = d.replace(/[^\-\d]/g,"");

Joe Over a year ago

@mplungjan, perhaps it is. I am not a RegExp expert by any means. I usually just hack something together that works; then forget what all the symbols mean.

mplungjan · Accepted Answer · 2011-07-20 14:32:17Z

Instead of fixing it on the client, fix it on the server

http://james.newtonking.com/archive/2009/02/20/good-date-times-with-json-net.aspx

JsonConverters

With no standard for dates in JSON, the number of possible different formats when interoping with other systems is endless. Fortunately Json.NET has a solution to deal with reading and writing custom dates: JsonConverters. A JsonConverter is used to override how a type is serialized.

public class LogEntry
{
  public string Details { get; set; }
  public DateTime LogDate { get; set; }
}

[Test]

public void WriteJsonDates()
{
  LogEntry entry = new LogEntry
  {
    LogDate = new DateTime(2009, 2, 15, 0, 0, 0, DateTimeKind.Utc),
    Details = "Application started."
  };

  string defaultJson = JsonConvert.SerializeObject(entry);

  // {"Details":"Application started.","LogDate":"\/Date(1234656000000)\/"}

  string javascriptJson = JsonConvert.SerializeObject(entry, new JavaScriptDateTimeConverter());

  // {"Details":"Application started.","LogDate":new Date(1234656000000)}

  string isoJson = JsonConvert.SerializeObject(entry, new IsoDateTimeConverter());

  // {"Details":"Application started.","LogDate":"2009-02-15T00:00:00Z"}

}

If not, does this work for you?

DEMO HERE

Date.parseWeird=Date.prototype.parseWeird=function(d) {
  // remove anything not a digit or - and convert to number
  return new Date(parseInt(d.replace(/[^\-\d]/g,""),10));
};

var d = "\/Date(-65424600000)\/"
var newDate = Date.parseWeird(d);
var mm = newDate.getMonth()+1;
if (mm<10) mm="0"+mm;
var dd = newDate.getDate();
if (dd<10) dd="0"+dd;
document.write(""+mm+"/"+dd+"/"+newDate.getFullYear())

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