Script to concatenate date and time into a hidden field

I am trying to use a script that concatenates a date field and a time field.

page1: Has the form that posts to page2.

page1 has a start date and start time as well as an end date and end time. It should put date and time together into a hidden field and then post the data.  In this demo I post it to page 2 but it will ultimately be inserted into a database.

Attached is the code for both pages. Any help is appreciated. As of now the values come up blank.
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>> var d = document.form1.endtime
>> var drop = d.options[d.selectedIndex];
>> <input type="text" class="form-control" value="11:34" name="endtime"  id="endtime">
d.options applies to <select> elements.  You probably have a plugin that simulates a dropdown view.    Try:
function putDateInHiddenFieldend() {
   var text = document.form1.endate;
   var hidden = document.form1.endatecomp;
   var d = document.form1.endtime;
//   var drop = d.options[d.selectedIndex];  get rid of this
   hidden.value = "";
   hidden.value += text.value + " " + d.value;//use d.value

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AleksAuthor Commented:
I used your script but still comes up blank. they are just fields, you can check the code I attached. no drop down menus.
AleksAuthor Commented:
I see ... in the previous page I used a drop down for the  'starttime', on this page its a simple text field.
AleksAuthor Commented:
I did this and it works now  :)

  <script language="javascript" type="text/javascript">
 function putDateInHiddenField() {
  var text = document.form1.startdate;
  var hidden = document.form1.startdatecomp;
  var d = document.form1.startime;
  hidden.value = "";
  hidden.value += text.value + " " + d.value;

Thanks !
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