In Ext.Date lines 148ff.:
Code:
// date calculations (note: the code below creates a dependency on Ext.Number.from())
"var me = this, dt, y, m, d, h, i, s, ms, o, O, z, zz, u, v, W, year, jan4, week1monday, daysInMonth, dayMatched",
    "def = me.defaults,",
    "from = Ext.Number.from,",
    "results = String(input).match(me.parseRegexes[{0}]);", // either null, or an array of matched strings
This results in def, from, results being global variables.
There is a comma missing in line 149 after dayMatched.

Unit Tests where are though?