// Приведение dateFromPOIXML, полученное из атрибутов XLSX-файла из закладки "Подробно" в строковое представление
    public static String dateFromPOIXMLToString(String date) throws ParseException {
        System.out.println("_date = " + date);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
        Date dt = df.parse(date);
        String str = df.format(dt);
        System.out.println("date = " + date);
        String day = date.substring(8, 10);
        String month = date.substring(5, 7);
        String year = date.substring(0, 4);
        System.out.println("fullDate = " + day + "-" + month + "-" + year);
        return day + "-" + month + "-" + year;
    }

_date = 2011-07-20T09:28:23Z
Exception in thread "main" java.text.ParseException: Unparseable date: "2011-07-20T09:28:23Z"
	at java.text.DateFormat.parse(DateFormat.java:366)
	at utils.Convert.dateFromPOIXMLToString(Convert.java:77)
	at Main.main(Main.java:58)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)

Process finished with exit code 1