Java Utililty Methods Date from String

int splitIndex = startTime.indexOf(':');
int hourOfDay = 0, minutes = 0;
try {
    hourOfDay = Integer.parseInt(startTime.substring(0, splitIndex));
    minutes = Integer.parseInt(startTime.substring(splitIndex + 1));
} catch (NumberFormatException e) {
Calendar cal = Calendar.getInstance();
...

int day, month, year;
int i = s.indexOf('/');
if (i < 0)
    return 0;
try {
    day = Integer.parseInt(s.substring(0, i));
} catch (NumberFormatException e) {
    return 0;
...

Calendar cal = Calendar.getInstance();
String[] arrDate = strDate.split("-");
String[] arrTime = strTime.split("[:-]");
cal.set(Integer.parseInt(arrDate[0]), Integer.parseInt(arrDate[1]) - 1, Integer.parseInt(arrDate[2]),
        Integer.parseInt(arrTime[0]), Integer.parseInt(arrTime[1]), Integer.parseInt(arrTime[1]));
return cal.getTime();

Calendar calendar = Calendar.getInstance();
calendar.set(new Integer(stringDate.substring(0, 4)), new Integer(stringDate.substring(4, 6)) - 1,
        new Integer(stringDate.substring(6, 8)), 0, 0, 0);
return calendar;

Calendar cal = GregorianCalendar.getInstance(TimeZone.getTimeZone("UTC +0"));
Date date = new Date();
date.setTime(millisSinceMidnight);
cal.setTime(date);
return cal.getTime();