lib/Ext/picker/Date.js
function(newDayText, oldDayText) {
        var innerItems = this.getInnerItems,
            ln = innerItems.length,
            item, i;

        //loop through each of the current items and set the title on the correct slice
        if (this.initialized) {
            for (i = 0; i < ln; i++) {
                item = innerItems[i];

                if ((typeof item.title == "string" && item.title == oldDayText) || (item.title.html == oldDayText)) {
                    item.setTitle(newDayText);
                }
            }
        }
    }
function(newDayText, oldDayText) {
        var innerItems = this.getInnerItems,
            ln = innerItems.length,
            item, i;

        //loop through each of the current items and set the title on the correct slice
        if (this.initialized) {
            for (i = 0; i < ln; i++) {
                item = innerItems[i];

                if ((typeof item.title == "string" && item.title == oldDayText) || (item.title.html == oldDayText)) {
                    item.setTitle(newDayText);
                }
            }
        }
    }
Updates the {@link #dayText} configuration.