I can't display a screen that contains calendar. Please change
case 'yy/MM/dd': //ja format case 'yyyy/MM/dd': //new ja format of Yii 1.11 return 'y/mm/dd';
Some i18n data was updated since Yii 1.11. Japanese short date format had been changed from 'yy/MM/dd' to 'yyyy/MM/dd'. This format is found also at some other locales.
It was automatically updated by newest CLDR data and I couldn't keep legacy compatibility. http://cldr.unicode.org/index/downloads