When you are adding 1 to the date text, it is adding it as a string.
You need to operate on it as a date.  This should work for you:

$("#arrive").datepicker({
  minDate: new Date(2009, 11 - 1, 6),
  onSelect: function(dateText, inst){
    var dtArrive = $.datepicker.parseDate('mm/dd/yy', dateText);
    var dtNextDay = $.datepicker.parseDate('mm/dd/yy', dateText);
    dtNextDay.setDate(dtNextDay.getDate()+1);
    var dtDepart = $("#depart").datepicker("getDate");
    //only (re)set the depart date if it is not yet set or earlier
than allowed
    if (dtDepart == null || dtDepart < dtNextDay){
      $("#depart").datepicker("setDate", dtNextDay);
    }
    $("#depart").datepicker("option","minDate", dtNextDay);
  }
});

$("#depart").datepicker({minDate: new Date(2009, 11 - 1, 7)});

It is here if you want to test it: http://jsbin.com/uteba/edit

Hth,

Dave


On Jul 28, 2:30 pm, Yvan <[email protected]> wrote:
> Thanks!  Just one last question --
>
> If I was to choose November 6th from the "Arrive" datepicker, .. the
> first choosable date in the "Depart" datepicker
> should be dynamically set to November 7th
>
> How would I achieve that?
>
> - yg
>
> On Jul 28, 2:16 pm, James Curran <[email protected]> wrote:
>
> > $(document).ready(function() {
> >         $("#arrive").datepicker({
> >                   minDate: new Date(2009, 11 - 1, 6),
> >                   onSelect: function(dateText, inst)
> >                                {    $("#depart').datepicker("option",
> > "minDate", new Date(dateText));  }
> >          });
> >         $('#arrive').datepicker();
> >         $('#calendar-trigger-arrive').click(function() {
> >          $('#arrive').datepicker('show');
> >         });
> >        });
>
> > On Tue, Jul 28, 2009 at 2:09 PM, Yvan<[email protected]> wrote:
>
> > > I'm unsure about specifically where within my script I'd need to add
> > > the function you've provided.  My script is as follows:
>
> > >        <script type="text/javascript">
> > >        $(document).ready(function() {
> > >         // $('#arrive').datepicker({dateFormat: 'dd-M-yy'});
> > >         $("#arrive").datepicker({minDate: new Date(2009, 11 - 1, 6),});
> > >         $('#arrive').datepicker();
> > >         $('#calendar-trigger-arrive').click(function() {
> > >          $('#arrive').datepicker('show');
> > >         });
> > >        });
> > >        </script>
>
> > > Please advise.
>
> > > Thanks,
> > > - yg
>
> > > On Jul 28, 1:56 pm, James Curran <[email protected]> wrote:
> > >> Well, this is untested, but it seems right......
>
> > >> $('#dateArrive').datepicker({onSelect: function(dateText, inst)
> > >>   {
> > >>     $("#dateDepart').datepicker("option", "minDate", new Date(dateText));
> > >>   })
>
> > >> });
> > >> On Tue, Jul 28, 2009 at 1:35 PM, Yvan<[email protected]> wrote:
>
> > >> > I have 2 jquery-based datepickers on a site that I'm developing
> > >> > (lefthand column - quick reservation form)
>
> > >> >http://www.theseagatehotel.com/www.theseagatehotel.com/index.html
>
> > >> > Is there any way that I can update the datepickers so that when you
> > >> > choose an "Arrive" date, .... the first choosable "Depart" date would
> > >> > be automatically updated to be 1 day after the chosen "arrive" date?
>
> > >> > For example, .. if I was to choose November 6th from the "Arrive"
> > >> > datepicker, .. the first choosable date in the "Depart" datepicker
> > >> > should be dynamically set to November 7th, .. and all dates before
> > >> > November 7th in that "Depart" datepicker should be grayed out and un-
> > >> > clickable.
>
> > >> > How would I accomplish something like this?  Is it even technically
> > >> > possible?
>
> > >> > Thanks,
> > >> > - Yvan
>
> > >> --
> > >> Truth,
> > >>     James
>
> > --
> > Truth,
> >     James
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