Java Utililty Methods Date Convert

List of utility methods to do Date Convert

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Description

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

Method

Calendarconvert(Date d)
convert 
Calendar cal = Calendar.getInstance();
cal.setTime(d);
return cal;
DateconvertDate(Object obj)
convert Date 
if (obj != null) {
    if (obj instanceof Calendar) {
        Calendar cal = (Calendar) obj;
        return cal.getTime();
    if (obj instanceof Date) {
        return (Date) obj;
return null;
longconvertDateTime(String date, String time)
convert Date Time 
Calendar calendar = GregorianCalendar.getInstance();
if (date != null) {
    String[] dates = date.split("/");
    int day = Integer.valueOf(dates[0]);
    int month = Integer.valueOf(dates[1]) - 1;
    int year = Integer.valueOf(dates[2]);
    calendar.set(Calendar.DATE, day);
    calendar.set(Calendar.MONTH, month);
...
longconvertDateTimeToSysTime(String sDateTime)
convert Date Time To Sys Time 
int nYear = Integer.parseInt(sDateTime.substring(0, 4));
int nMonth = Integer.parseInt(sDateTime.substring(4, 6));
int nDay = Integer.parseInt(sDateTime.substring(6, 8));
int nHour = 0, nMinute = 0, nSecond = 0;
if (sDateTime.length() == 14) {
    nHour = Integer.parseInt(sDateTime.substring(8, 10));
    nMinute = Integer.parseInt(sDateTime.substring(10, 12));
    nSecond = Integer.parseInt(sDateTime.substring(12, 14));
...
StringConvertDateToAge(String date)
Converts the date in format yyyy/mm/dd to the age of the person 
if (date == null)
    return "";
int year, month, day;
try {
    int pos = date.indexOf("/");
    int prev_pos = pos + 1;
    year = Integer.parseInt(date.substring(0, pos));
    pos = date.indexOf("/", pos + 1);
...
DoubleconvertDateToDoubleTime(Date time)
convert Date To Double Time 
if (time == null) {
    return null;
Calendar c = Calendar.getInstance();
c.setTime(time);
double t = ((c.get(Calendar.HOUR_OF_DAY) * 60 + c.get(Calendar.MINUTE)) * 60 + c.get(Calendar.SECOND))
        * 1000 + c.get(Calendar.MILLISECOND);
Double d = new Double(t / DAY_MILLIS);
...
intconvertDateToInt(final Date date)
Converts a Date to an Integer formated as YYYYMMDD 
calendar.setTimeInMillis(date.getTime());
return (calendar.get(Calendar.YEAR) * 10000) + ((calendar.get(Calendar.MONTH) + 1) * 100)
        + calendar.get(Calendar.DAY_OF_MONTH);
longconvertDateToLong(int year, int month, int day, int hour, int minute, int second)
convert a given date to long representation 
Date d = getDate(year, month, day, hour, minute, second);
return d.getTime();
longconvertDateToServerTimeZoneDateInMilliSec(String timeZoneName, long milliSecond)
This will convert server date/time to specified Time zone date/time and return the date in milliSecond. 
if (timeZoneName != null) {
    TimeZone loginTimeZone = TimeZone.getTimeZone(timeZoneName);
    Calendar calender = Calendar.getInstance(loginTimeZone);
    if (milliSecond != 0) {
        calender.setTimeInMillis(milliSecond);
    calender.add(Calendar.MILLISECOND, -(calender.getTimeZone().getRawOffset()));
    calender.add(Calendar.MILLISECOND, -(calender.getTimeZone().getDSTSavings()));
...
longconvertDateToTimeStamp(Date date)
This method is used for converting date to time stamp in long 
Calendar calendar = new GregorianCalendar();
calendar.setTime(date);
return calendar.getTimeInMillis();