To add 5 and half hours in a selected column of datatable

                 To add 5 and half hours in a selected column of datatable
                for (int i=0; i<dt.Rows.Count; i++)
                {
                    string date1 = dt.Rows[i][5].ToString();
                    string [] date2 = date1.Split(' ');
                    string[] date3 = date2[1].Split(':');
                    int hr = Convert.ToInt32(date3[0]) + 5;
                    int mm = Convert.ToInt32(date3[1]);
                    string mm1 = string.Empty;
                    if (Convert.ToInt32(date3[1]) > 30)
                    {
                        hr = hr + 1;
                        mm = mm - 30;
                        mm1 = mm.ToString("00");
                        //mm = Convert.ToInt32(mm1);
                    }
                    else
                    {
                        mm1 = Convert.ToString((Convert.ToInt32(date3[1]) + 30));
                    }

                    string date4 = Convert.ToString(hr) + ":" + Convert.ToString(mm1) + ":" + Convert.ToString(date3[2]);
                    string date5 = date2[0] + " " + date4;

                    dt.Rows[i][5] = date5;
                    //dt2.Columns.Add("Created");

                }                

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<script type="text/javascript">
 function RedirectUrl() {
 var tb = document.getElementById("tbSearch").value;
 var cs = document.getElementById("sfield").value;
 var url = "";

 if (tb != "") {
  if (cs == "Column5" || cs == "Column6"){
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  window.location.href = "AllItems.aspx?" + url;
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 function ClearUrl() {
 window.location.href = "AllItems.aspx";
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</script>
Search Field: <select id="sfield">
<option selected value="Title" >Person Name</option>
<option value="Column2">Status</option>
<option value="Column4">Case #</option>
<option value="Column5">Date taken</option>
<option value="Column6">DOB</option>
<option value="Column8">other #</option>
<option value="Column10">Notes</option>
<option value="Column12">employee</option>
</select>
&nbsp;
Search text: <input type="text" id="tbSearch" />
<input type="button" id="btnSearch" value="Search" onclick="return RedirectUrl();" />
<input type="button" id="btnClear" value="Clear" onclick="return ClearUrl();" />

Inside of the List or Library use this java script in Script Editor