Java Utililty Methods Date Format Change

List of utility methods to do Date Format Change

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Description

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

Method

StringchangeDateFormat(String dateString, String srcFormat, String destFormat)
Convert the string date to a particular format. 
if (srcFormat == null || destFormat == null || srcFormat.isEmpty() || destFormat.isEmpty()) {
    return "";
SimpleDateFormat dateFormat = new SimpleDateFormat(srcFormat);
if (dateString == null || dateString.isEmpty()) {
    return "";
java.util.Date dateVal = dateFormat.parse(dateString, new ParsePosition(0));
...
DateFormatchangeDateFormatPattern(final DateFormat dateFormat, String regex, String replacement)
change Date Format Pattern 
if (dateFormat instanceof SimpleDateFormat) {
    SimpleDateFormat simpleDateFormat = (SimpleDateFormat) dateFormat;
    String pattern = simpleDateFormat.toPattern().replaceAll(regex, replacement);
    simpleDateFormat.applyPattern(pattern);
    return simpleDateFormat;
return dateFormat;
StringchangeDateTimeZone(String date_GMT)
change Date Time Zone 
DateFormat format = new SimpleDateFormat("M/d/yyyy hh:mm:ss a");
format.setTimeZone(TimeZone.getTimeZone("GMT"));
Date date = format.parse(date_GMT);
format.setTimeZone(timeZone);
return format.format(date);
DatechangeDateValue(Date firstDate, Date secondDate)
change Date Value 
Calendar calendarFirst = Calendar.getInstance();
calendarFirst.setTime(firstDate);
Calendar calendarSecond = Calendar.getInstance();
calendarSecond.setTime(secondDate);
calendarSecond.set(Calendar.YEAR, calendarFirst.get(Calendar.YEAR));
calendarSecond.set(Calendar.MONTH, calendarFirst.get(Calendar.MONTH));
calendarSecond.set(Calendar.DAY_OF_MONTH, calendarFirst.get(Calendar.DAY_OF_MONTH));
return calendarSecond.getTime();
...
StringconvertDate(String date, String sourceFormat, String destinationFormat)
convert the input date from source to destination format 
String returnDateString = "";
SimpleDateFormat formatter = new SimpleDateFormat(sourceFormat);
Date returnDate = formatter.parse(date);
formatter = new SimpleDateFormat(destinationFormat);
returnDateString = formatter.format(returnDate);
return returnDateString;
DateconvertDate(String date, String[] formats)
This method try to parse a string into a Date object using an array with the valid formats 
Date ret = null;
for (String pattern : formats) {
    try {
        ret = new SimpleDateFormat(pattern).parse(date);
        break;
    } catch (java.text.ParseException e) {
if (ret == null)
    throw new java.text.ParseException(date, 0);
return ret;
StringconvertDate(String dateIn, String fromDateFormat, String toDateFormat)
convert Date 
String dateOut;
try {
    SimpleDateFormat formatIn = new SimpleDateFormat(fromDateFormat);
    SimpleDateFormat formatOut = new SimpleDateFormat(toDateFormat);
    Date data = formatIn.parse(dateIn, new ParsePosition(0));
    dateOut = formatOut.format(data);
} catch (Exception e) {
    dateOut = null;
...
StringconvertDate(String inPattern, String outPattern, String date)
convert Date 
Date newDate = getDate(inPattern, date);
return formatDate(outPattern, newDate);
StringconvertDate(String inPattern, String outPattern, String date)
Parses a date string according to a specified input pattern, and formats the date back to a string according to a specified output pattern. 
Date newDate = getDate(inPattern, date);
return formatDate(outPattern, newDate);
StringconvertDate(String str)
convert Date 
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
SimpleDateFormat sdf1 = new SimpleDateFormat("yyyy-MM-dd");
return sdf1.format(sdf.parse(str));