Java Utililty Methods Date to Time

return d.getTime() + CACHED_CALENDAR.get().get(Calendar.ZONE_OFFSET);

Calendar calendar = getCalendar();
return d.getTime() + calendar.get(Calendar.ZONE_OFFSET);

int index = dateTime.indexOf(" ");
String date = dateTime.substring(0, index);
String time = dateTime.substring(index + 1);
int dateSlash1 = date.indexOf("-");
int dateSlash2 = date.lastIndexOf("-");
if (dateSlash1 <= 0 || dateSlash1 == dateSlash2)
    return -1;
int timeColon1 = time.indexOf(":");
...

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
String da = sdf.format(date);
da = da + " 23:59:59";
Date d = getStrToDate(DATE_FORMAT_1, da);
return d;

Calendar calStart = new GregorianCalendar();
calStart.setTime(date);
String hour = String.valueOf(calStart.get(Calendar.HOUR_OF_DAY));
String zero = "0";
if (hour.length() < 2) {
    hour = zero.concat(hour);
String min = String.valueOf(calStart.get(Calendar.MINUTE));
...

if (date == null) {
    return null;
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.YEAR, 1970);
calendar.set(Calendar.DAY_OF_YEAR, 1);
return calendar.getTime();
...

if (null == date) {
    date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.YEAR, 0);
calendar.set(Calendar.MONTH, 0);
calendar.set(Calendar.DAY_OF_MONTH, 0);
...

if (null == oDate) {
    return null;
final Calendar c = Calendar.getInstance();
c.setTime(oDate);
c.set(Calendar.YEAR, 1970);
c.set(Calendar.MONTH, 0);
c.set(Calendar.DAY_OF_MONTH, 1);
...

SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
Date timeWithoutDate = sdf.parse(sdf.format(dateObject));
return timeWithoutDate;

SimpleDateFormat _sdf = new SimpleDateFormat("aa");
String _value = _sdf.format(date);
return _value;