Java Utililty Methods Day of

Date d = strToDtSimpleFormat(date);
Calendar cal = Calendar.getInstance();
cal.setTime(d);
cal.set(Calendar.DAY_OF_WEEK, Calendar.THURSDAY);
return dateFormat(cal.getTime());

return (((Float.parseFloat(hour.format(cal.getTime())) * 3600)
        + (Float.parseFloat(minute.format(cal.getTime())) * 60)
        + Float.parseFloat(second.format(cal.getTime()))) * 1000);

Calendar c = Calendar.getInstance();
if (daysInFuture != null)
    c.add(Calendar.DAY_OF_YEAR, daysInFuture);
return new SimpleDateFormat(format).format(c.getTime());

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try {
    Date date = myFormatter.parse(sj1);
    Date mydate = myFormatter.parse(sj2);
    day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
    return "";
...

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
long day = 0;
try {
    java.util.Date date = myFormatter.parse(sj1);
    java.util.Date mydate = myFormatter.parse(sj2);
    day = (date.getTime() - mydate.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
    return "";
...

SimpleDateFormat localFormat = (SimpleDateFormat) format;
long day = 0;
try {
    java.util.Date startDay = localFormat.parse(startDate);
    java.util.Date endDay = localFormat.parse(endDate);
    day = (endDay.getTime() - startDay.getTime()) / (24 * 60 * 60 * 1000);
} catch (Exception e) {
    return "";
...

int result = -1;
if (d1.after(d2)) { 
    Calendar swap = d1;
    d1 = d2;
    d2 = swap;
int charge_start_date = 0;
int charge_end_date = 0;
...

String strDate = getCurrenDateTime();
Calendar cale = toCalendar(strDate);
cale.add(Calendar.DAY_OF_YEAR, -1);
return dateFormatterByPattern(cale.getTime(), "yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();
if (offsetDays != 0)
    calendar.add(Calendar.DATE, offsetDays);
Date date = calendar.getTime();
return formatDD(date);

SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
simpleDateFormat.setLenient(false);
Date date = null;
try {
    date = simpleDateFormat.parse(number.substring(6, 14));
} catch (ParseException e) {
    return false;
return date.before(new Date());