Date is displayed as 41606.4350485301 and not 2013-11-28 10:20:30.783 !

[C# Programming]

End Google Ads 201810 - BS.net 01 --> I have this code

Date = Convert.ToDateTime(ds1.Tables[0].Rows[i].ItemArray[1])
in which ds1.Tables[0].Rows[1].ItemArray[1] holds 2013-11-28 10:20:30.783

But when I write this variable value Date to excel spreadsheet, I'm seeing value like this 41606.4350485301 on excel where it should be the date stored in my dataset. Why is that?