Java Utililty Methods Date Add

List of utility methods to do Date Add

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Description

The list of methods to do Date Add are organized into topic(s).

Method

StringaddDate(String date1, String addpart, int num)
add Date 
return addTime(date1, addpart, num).substring(0, 10);
java.util.DateaddDate(String dt, long day)
add Date 
if (dt == null) {
    throw new IllegalArgumentException("dt can not be null");
int len = dt.length();
if (!(len == 8 || len == 14)) {
    throw new IllegalArgumentException("dt length must be 8 or 14 (yyyyMMdd or yyyyMMddHHmmss)");
if (len == 8) {
...
DateaddDateByDays(int days)
add Date By Days 
return addDateByDays(getCurrentDate(), days);
DateaddDateDay(int day)
add Date Day 
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.DATE, day);
return calendar.getTime();
voidaddDateParam(String dtstr, boolean start, List where)
Adds a date parameter (start, end) as filter to the SQL where clause 
if (dtstr != null && isValidDate(dtstr)) {
    where.add("c.loginTime " + (start ? ">= '" : "<= '") + dtstr.substring(0, 4) + "-"
            + dtstr.substring(4, 6) + "-" + dtstr.substring(6) + " 00:00:00.000'");
DateaddDates(Date startDate, int days)
add Dates 
Calendar cc = Calendar.getInstance();
if (startDate != null) {
    cc.setTime(startDate);
    cc.add(Calendar.DATE, days);
    return cc.getTime();
} else {
    return null;
DateaddDay(Date date, int days)
add Day 
Calendar cale = Calendar.getInstance();
cale.setTime(date);
cale.add(Calendar.DAY_OF_YEAR, days);
return cale.getTime();
DateaddDays(Date date1, long days)
add Days 
return addSeconds(date1, days * ONE_DAY_SECONDS);
DateaddDays(Date dateToAdd, int numberOfDay)
Add given number of days to a date. 
if (dateToAdd == null) {
    throw new IllegalArgumentException("Date can't be null!");
Calendar tempCal = Calendar.getInstance();
tempCal.setTime(dateToAdd);
tempCal.add(Calendar.DATE, numberOfDay);
return tempCal.getTime();
DateaddDays(Date target, int days)
add Days 
long msPerDay = 1000 * 60 * 60 * 24;
long msTarget = target.getTime();
long msSum = msTarget + (msPerDay * days);
Date result = new Date();
result.setTime(msSum);
return result;