Problem when export an HTML content to open office application.

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C#

ASP.NET

Hello All.

I am facing a problem when I am trying to export an HTML content to open office application.
I am using ASP.Net with C#.
I have a datatable and one of it's column is say "Average Hours".
It holds the value suppose as "08:50" as string type.
That means average hours for an employee is 08 hours and 50 minutes.
When the HTML is exported into open office application,
it is showing as 08:50:00 AM.
I think default time format for open office is set as HH:MM:SS AM/PM.
When I am changing the format to only HH:MM in open office, then values in column is showing properly.
But in Microsoft Office (Excel) application, it is all right.

Suppose my HTML content is as follows--

<table>
	<tr>
            <td>08:50
            </td>
        </tr>
</table>   

Is there any way to manage this problem through my code with out changing the format every time in open office. in C#.
Please help me.
Thanks a lot.