Two datetimepickers: set minDate on one, changes val of the other.

Seen in both 0.91 dev and 0.91 stable:

Steps to reproduce, in Firefox:

1. Put two dtpickers on the page, instantiated however you like.
2. Make the following call:

```
$("#first-time-picker").datetimepicker('option', 'minDate', null);
```

1. If the second datetimepicker had a value equal to the empty string, then it will now receive the current datetime as its value, even though the call from step 2 (seemingly) makes no call to the second time picker. It should remain blank, as it does with the plain, old datepicker.

[jhuttner]

Just tried the 0.9.2 dev. Still no dice. Here is some pseudocode to reproduce:

//bind somewhere
$("#start").datetimepicker{(
   onSelect: function(dateText, inst){
      $("#end").datetimepicker('option', 'minDate', dateText);
   }
});

$("#end").datetimepicker{(
   onSelect: function(dateText, inst){
      $("#start").datetimepicker('option', 'maxDate', dateText);
   }
});

When a date in #one is selected, the actual input value of #two is changing. I.e. the value in the input box. All that should change is the minimum date of the input.

Let me know if this doesn’t clarify things, Trent.

-Joseph

[jmthomas]

I just pulled from dev (0.9.4) and it looks like the onSelect function still has serious problems. Thanks to roker002 I discovered the beforeShow function. This has basically solved my problems as the date works correctly (I still have time issues):

var startdate = $("#startdate").datetimepicker({
  // declare options
  beforeShow: function(){
    $("#startdate").datetimepicker("option", {
      maxDate: $("#enddate").datetimepicker('getDate')
    });
  }
});
var enddate = $("#enddate").datetimepicker({
  // declare options
  beforeShow: function(){
    $("#enddate").datetimepicker("option", {
      minDate: $("#startdate").datetimepicker('getDate')
    });
  }
});