incompatble with extjs and nogray calendars

```
What steps will reproduce the problem?
1. Using "extjs" OR "nogray" Calendar with date.js in the same page

What is the expected output? What do you see instead?
With nogray calendar.- you cant pass months, date class bugged!!
With extjs calendar.- When you select a date the month get +1 value, i mean
if u selected 01/Jan/2010, the output will be 01/Feb/2010

What version of the product are you using? On what operating system?
Date.js- Version: 1.0 Alpha-1
Nogray Calendar- all versions
Extjs Calendar- v3.1.1

```

Original issue reported on code.google.com by `enrique...@gmail.com` on 16 Mar 2010 at 12:41