return this.set({ day: this.getDaysInMonth()}); 
return this.set({ day: $D.getDaysInMonth(this.getFullYear(), this.getMonth())}); 
    $P.moveToLastDayOfMonth = function () {         return this.set({ day: this.getDaysInMonth()});    };
2975	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/2975/03ae1ab662e66736518b465f8d80c143053a8fa5/core-debug.js/buggy/src/core-debug.js