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Problem with RadDatePicker control - Cannot select 01/10/2009

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16 Answers, 1 is accepted

answered on 22 Oct 2009, 12:57 AM

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answered on 23 Oct 2009, 07:21 AM

Ok, it appears that this issue is related to daylight savings.
The problem code is located within the RadDateInputScript.js file.

    
            GetDate: function(_24, _25) {  
        
                    console.log('GetDate: IN=' + _24 + ', ' + _25);       
        
                    var _26 = DateEntry.CloneDate(_25);       
        
                    this.Distribute(_24);  
        
                    if (this.NumericSpecialCase(_24)) {  
        
                        throw new DateParseException();  
        
                    }  
        
                    var _27 = this.GetYear();  
        
                    if (_27 != null) {  
        
                        _26.setFullYear(_27);  
        
                    }  
        
                    var _28 = this.GetMonth();  
        
                    if (_28 != null) {  
        
                        this.SetMonth(_26, _28);  
        
                    }          
        
                    var day = this.GetDay();  
        
                    if (day != null) {  
        
                        this.SetDay(_26, day);  
        
                    }         
        
                    console.log('GetDate: OUT=' + _26);       
        
                    return _26;  
        
                }

When my timezone is set to "W. Australia Standard Time" WITH daylight savings selected, this function behaves as follows.

    
            GetDate: IN=1,1,2009, Fri Oct 23 2009 00:00:00 GMT+0800  
        
            GetDate: OUT=Thu Jan 31 2008 23:00:00 GMT+0900

When my timezone is set to "W. Australia Standard Time" WITHOUT daylight savings selected, this function behaves as follows.

    
            GetDate: IN=1,1,2009, Fri Oct 23 2009 00:00:00 GMT+0800  
        
            GetDate: OUT=Thu Jan 01 2009 00:00:00 GMT+0800

Is this a bug?

answered on 23 Oct 2009, 01:16 PM

Hello Matthew,

This is not a bug in RadDateInput, but a behavior in the built-in Javascript Date object. Using the same time zone, try setting a new Date object and then alert it, like this:

var d = new Date("1/1/2009");
alert(d);

Chances are, you are going to get Wed Dec 31 2008 23:00:00

What happens is that when daylight saving is turned on, the Date objects turns the date 1 hour back. If you want to select the earliest date and time on January 1, 2009, you need to create a Date object with a time of 01:00:00:

var d = new Date("1/1/2009 01:00:00");
alert(d);

Output: Thu Jan 1 2009 01:00:00

I believe the problem you are experiencing is closely to this. On the other hand, I cannot reproduce this behavior neither in WinXP SP2 nor in SP3 with Australian time zone (+8 Perth). Can you give any further instructions?

Sincerely yours,
Veli
the Telerik team

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answered on 26 Oct 2009, 01:16 AM

Here's what I've found out.

Adjust for DST ON
var d = new Date("1/1/2009");
Result = Wed Dec 31 23:00:00 UTC +0800 2008

var d = new Date("12/31/2008");
Result = Wed Dec 31 00:00:00 UTC +0800 2008

var d = new Date("1/2/2009");
Result = Fri Jan 2 00:00:00 UTC +0900 2009

var d = new Date("1/1/2009 00:59:00");
Result = Wed Dec 31 23:59:00 UTC +0800 2008

var d = new Date("1/1/2009 01:00:00");
Result = Thu Jan 1 01:00:00 UTC +0900 2009

Adjust for DST OFF
var d = new Date("1/1/2009");
Result = Thu Jan 1 00:00:00 UTC +0800 2009

var d = new Date("12/31/2008");
Result = Wed Dec 31 00:00:00 UTC +0800 2008

var d = new Date("1/2/2009");
Result = Fri Jan 2 00:00:00 UTC +0800 2009

var d = new Date("1/1/2009 00:59:00");
Result = Thu Jan 1 00:59:00 UTC +0800 2009

var d = new Date("1/1/2009 01:00:00");
Result = Thu Jan 1 01:00:00 UTC +0800 2009

1. Javascript adjusts dates for daylight savings time. I would not have expected this behaviour. If I create a date object with "1/1/2009", I expect it to maintain this value.

2. Out customer has incorrectly configured daylight savings to start on 1/1 at 12am. This is the reason why 1/1/2009 causes us problems. I have updated the daylight savings settings on my local machine to start in October at 2am, and everything appears to function correctly.

3. I still believe there is a bug in the telerik datepicker in the case where daylight savings starts at 1/1 at 12am. If I type 1/1/2009 into the RadDatePicker control, I expect 1/1/2009 to be displayed. If for some reason, the date is adjusted for DST (which it shouldn't be), it should display 31/12/2008 rather than 31/1/2008.

For now, I think we can work around any issues by correcting the DST settings on the workstations.

Thanks for your help.
Matt

answered on 28 Oct 2009, 12:18 PM

video.zip

Hello Matthew,

Still nothing. Attaching a video.

Best wishes,
Veli
the Telerik team

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Problem with RadDatePicker control - Cannot select 01/10/2009

16 Answers, 1 is accepted