calendar picker is conflicting with date.js

[zrehan]

I have set -up calendar-picker and added hijri calendar picker successfully and when I add date.js in the same project It gives me error saying

Uncaught TypeError: year.calendar is not a function

May be this is because of the year being an object in the keith-wood and year being a integer in the date.js
What is the solution for this?

PS: I can't remove either of them from the project.