Prevent Timepicker putting datetime value when it is shown

Prevent Timepicker putting datetime value when it is shown

Hello, I am using this plugin  http://trentrichardson.com/examples/timepicker/

What I want is to prevent this plugin populating the textbox when it is displayed first when clicking inside the textbox. Thing is it overwrites if there was a value that came from database and there is no way to undo, unless user refreshes the form. Any way to make this behave like the jQuery datepicket?

The original datepicker won't put value in the textbox until a date is selected from the calendar.