jQuery Datepicker Width
If you are using the jQuery datepicker in its default form, then just add this to your css and it should work:
.ui-datepicker {
width: 17em; /*what ever width you want*/
}
Reducing the font size of the calendar will reduce the width of the date picker.
You can reduce the font size by adding this css:
div.ui-datepicker
{
font-size:10px;
}