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Trouble with Date formatting in Sql Server 2008, ASP.net, and then Javascript

Posted on 2014-12-05
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Last Modified: 2014-12-05
I'm writing an Asp.net in C# application that retrieves data from Sql Server 2008 and converts it to JSON so it can be placed on a Google Map.  Trying to figure out the proper way to handle date formatting is driving me crazy.

In Sql Server, the date column is an nvarchar (and there is nothing I can do about that).   Sometimes this column is like 18-OCT-10 17:36, 4/8/2009 11:34:00 AM, 3/3/11, or is just null or blank.  For testing I'm retrieving rows that are 6/15/14.  If I don't do any CASTS or CONVERTS with t-sql and bring it into my asp.net application like this...
dsGetFieldPoints.SelectParameters["trackID"].DefaultValue = trkID;
var fieldPts = dsGetFieldPoints.Select(DataSourceSelectArguments.Empty) as DataView;
var fieldPtMarkers = new List<FieldPoint>();

            foreach (DataRowView pt in fieldPts)
            {
                FieldPoint fp = new FieldPoint();
                fp.locDate = (string)pt["locDate"];
                fieldPtMarkers.Add(fp);
            }
            JavaScriptSerializer js = new JavaScriptSerializer();
            var fieldPtsJson = js.Serialize(fieldPtMarkers);
            var fieldPtsJsonFinal = "{\"fieldPoints\": " + fieldPtsJson + "}";
            ClientScript.RegisterStartupScript(this.GetType(), "Google Maps Initialization and Add Pts",
                      string.Format("initializeMap({0}, {1});", photosJson, fieldPtsJsonFinal), true);

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In the JSON output the date looks like this - "6/15/14", but when I use javascript....
var fDate = new Date(fMarker.locDate);
fDate.toDateString()

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I get this Mon  6/14/1914.   So I'm using a With clause in my t-sql statement and I try this....
With fieldPts AS 
		(SELECT 		
		CAST(ISNULL(fp1.Loc_Date, '') AS DATE) AS locDate....)
SELECT 
CAST(fp.locDate AS NVARCHAR) AS locDate....

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In the JSON output the date looks like this "2014-06-15", but when I use the javascript it looks like this Sat  6/14/2014.   So I try not converting it back to nvarchar....
With fieldPts AS 
		(SELECT 		
		CAST(ISNULL(fp1.Loc_Date, '') AS DATE) AS locDate....)
SELECT 
fp.locDate....

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And then updating my asp.net code to .....
fp.locDate = (DateTime)pt["locDate"];

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the JSON output looks like this "\/Date(1402808400000)\/" and the javascript produces undefined  Invalid Date.
In my t-sql I've tried using CONVERT...
convert(date, CAST(ISNULL(fp1.Loc_Date, '') AS DATE), 112) AS locDate

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but it doesn't seem to work since I always get the same format of 2014-06-15.   What can I do now?  Thanks
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Question by:Nate_LR
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7 Comments
 
LVL 29

Expert Comment

by:sammySeltzer
ID: 40483450
I had similar situation and this is what worked for me:

convert(char(10),fp1.Loc_Date,101) AS locDate

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See if this is any help to you.
0
 

Author Comment

by:Nate_LR
ID: 40483533
Sammy I tried this... T-sql
With fieldPts AS 
		(SELECT 		
		convert(char(10),fp1.Loc_Date,101) AS locDate,....)
SELECT 
fp.locDate....

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Asp.net
fp.locDate = (string)pt["locDate"];

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the date in the JSON output is "6/15/14   " but when I use the javascript...
var fDate = new Date(fMarker.locDate);
fDate.toDateString()

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I get this Mon Jun 15 1914.  

The other thing I can't figure out is if I change the recommendation you gave to...
convert(char(10),fp1.Loc_Date,102) AS locDate,

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it should give me 2014.06.15 but when I run the stored procedure I still get 6/15/14.
0
 
LVL 29

Expert Comment

by:sammySeltzer
ID: 40483565
When you use my recommendation, you should get 6/15/2014.

First, what is the data type of your date?

Second, what format are you looking for?

Ok, I read again and you said nvarchar but what format do you want?
0
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Author Comment

by:Nate_LR
ID: 40483588
The data type is nvarchar.  I'd like to convert it to date somewhere, but that might prove difficult with all the varieties of date formats in that column (18-OCT-10 17:36, 4/8/2009 11:34:00 AM, 3/3/11, or is just null or blank).
0
 
LVL 29

Accepted Solution

by:
sammySeltzer earned 2000 total points
ID: 40483609
One last question, you didn't answer this one in my last question.

What format do you want it?

In the meantime, try this:

select convert(varchar,cast(locdate as date),101)

I know you want to convert it to date  but what format?

Also, I just realized that it is already in nvarchar data type, so we can't possibly be still using convert(varchar...

It should be something like convert(date, datefield, number).

Get back with me first and we will try something.

In the meantime, you can try this:

select convert(varchar,cast(fp1.Loc_Date,101 as date),101)

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This should give you format of mm/dd/yyyy
0
 

Author Comment

by:Nate_LR
ID: 40483684
You had an extra 101 in your solution, but I tried this...
convert(varchar,cast(fp1.Loc_Date as date),101) AS locDate

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And it worked.  Thanks sammy!
0
 
LVL 29

Expert Comment

by:sammySeltzer
ID: 40483715
I am glad you caught. That was a typo and even happier that it worked for you.
0

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