No. 10 before the query data does not show a problem

// The main problem is time screening questions 
// as not convert 2019/12/02 2019/12/2 This problem led 


// 1:00 formatted data control is bound date methods:.
 <ASP: the BoundColumn the DataField = "AddTime" HeaderText = "added" DataFormatString = "{0: yyyy-the mM-dd HH: mm}> </ ASP: the BoundColumn> 
<ASP: the BoundField the DataField =" AddTime "HeaderText =" added "DataFormatString =" {0: yyyy }-dd -MM "/>
 
// 2 when a data binding DataBinder.Eval:. DataBinder.Eval (Container.DataItem," AddTime "," {0: the MM-dd-YYYY} ")
 
//. 3. date display format for direct conversion method ToString: DateTime.Now.ToString ( "the mM-dd-YYYY HH: mm: SS") 
. // String class. 4 for converting date display format: the String.Format ( "{0: YYYY- dd}-the MM ", the DateTime.Now)
 
//. 5. The method of converting a date display format DateTime.Parse DateTime.Parse (" 2012-2-22 "). ToString ("the MM-dd-YYYY ") 
. //. 6 by converting the date display format Convert.ToDateTime Method:






Convert.ToDateTime("2012-12-21").ToString("yyyy-MM-dd")