Cannot read property 'set' of undefined

I'm trying to edit the min value of an existing picker on my page. I'm using
```
$('#FromDate').pickadate('picker').set('min', true);
$('#ToDate').pickadate('picker').set('min',true);
```

When putting the code in my document.ready I get the following error
**Cannot read property 'set' of undefined**

Placing the code in an $(window).on('load', function ()) works, but then the changes are not always applied to the datepicker Q.Q.

What am I missing here?