saas-one/frontend/operation-web/overrides/form/field/Date.js

Ext.define('saas.override.form.field.Date', {
    override: 'Ext.form.field.Date',
    formatText: '',

    setValue: function (v) {
        var me = this;

        if(v && me.format) {
            v = new Date(v);
            v = Ext.Date.format(v, me.format);
        }

        me.callParent(arguments);
    },

});