Java Utililty Methods Minute Calculate

return (new Date().getTime() + minuteDelt * 60000) / 1000;

ca.setTime(stdt(time));
ca.add(Calendar.MINUTE, minute);
return dtts(ca.getTime());

DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Date dNow = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(dNow);
calendar.add(Calendar.MINUTE, offSetInMinutes);
dNow = calendar.getTime();
return dateFormat.format(dNow);

int diffMinutes = 0;
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
Date startDate = null, endDate = null;
try {
    startDate = dateFormat.parse(startTime);
    endDate = dateFormat.parse(endTime);
    Calendar calStart = Calendar.getInstance();
    calStart.setTime(startDate);
...

if (!s.contains(" "))
    throw new Exception();
Date date = new SimpleDateFormat("yyyy-MM-dd HH:mm").parse(s);
long time = date.getTime() - (minutes * 10000L);
date.setTime(time);
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
return sf.format(date);

Calendar cal = Calendar.getInstance();
cal.setTime(smdate);
long time1 = cal.getTimeInMillis();
cal.setTime(bdate);
long time2 = cal.getTimeInMillis();
long between_days = (time2 - time1) / (1000 * 60);
return Integer.parseInt(String.valueOf(between_days));

SimpleDateFormat formatter = new SimpleDateFormat(format, Locale.UK);
Calendar calendar = Calendar.getInstance(Locale.UK);
calendar.setFirstDayOfWeek(Calendar.MONDAY);
calendar.setMinimalDaysInFirstWeek(4);
Date date1 = null;
Date date2 = null;
try {
    date1 = formatter.parse(from);
...

String result;
DecimalFormat fmt = new DecimalFormat("00");
result = fmt.format(mins % 60);
mins /= 60;
result = fmt.format(mins % 24) + result;
mins /= 24;
result = fmt.format(mins) + result;
return result;
...

if (date == null)
    date = getToday();
return changeMinute(date, minutes);

Calendar cal = Calendar.getInstance();
cal.add(Calendar.MINUTE, minute);
return cal.getTime();