I have two time pickers and unable to compare its values with each other.

Like I have one time picker for start time and another for end time and I need to compare start time must be less than end time. Also dynamically by comparing some logic I need to disable some times. Below is my code :

```
$('#txtEndTime').pickatime({
"min": "9:30 AM",
"max": "7:00 PM"
});

$('#txtStartTime').pickatime({
"min": "9:00 AM",
"max": "6:30 PM"
});
```