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

longconvertDate(String value)
Convert from the two commonly used date formats to a timestamp 
long timestamp;
try {
    timestamp = Long.parseLong(value);
    if (timestamp < 0) {
        throw new NumberFormatException("negative timestamp!");
} catch (NumberFormatException e) {
    try {
...
StringconvertDateFormat(String date, SimpleDateFormat formatBefore, SimpleDateFormat formatAfter)
convert Date Format 
String convertDateStr = formatAfter.format(formatBefore.parse(date));
return convertDateStr;
StringconvertDateFormat(String sourceDate, String sourceDateFormat, String destDateFormat)
convert Date Format 
Calendar calendar = Calendar.getInstance();
calendar.setTime(new SimpleDateFormat(sourceDateFormat).parse(sourceDate));
String destDate = new SimpleDateFormat(destDateFormat).format(calendar.getTime());
return destDate;
StringconvertDateFormatByRawOffset(DateFormat formatter, int rawOffset, long milliSecond)
convert Date Format By Raw Offset 
TimeZone destTZ = TimeZone.getDefault();
String[] timeZoneIds = TimeZone.getAvailableIDs(rawOffset);
if (timeZoneIds != null && timeZoneIds.length > 0) {
    destTZ = TimeZone.getTimeZone(timeZoneIds[0]);
    formatter.setTimeZone(destTZ);
} else {
    formatter.setTimeZone(destTZ);
return formatter.format(new Date(milliSecond));
StringconvertDateFromInDayFormat(String stringDate, String hhmmss)
Convert date from yyyy-MM-dd format or from yyyyMMdd format into yyyyMMdd'T'HHmmss format. 
if (stringDate == null || stringDate.length() == 0) {
    return "";
StringBuffer sb = null;
SimpleDateFormat formatter = new SimpleDateFormat(PATTERN_YYYY_MM_DD);
Date date;
try {
    formatter.setLenient(false);
...
StringconvertDateFromTo(String stringDate, String patternToUse, TimeZone timezoneIn, TimeZone timezoneOut)
Convert date from the input date format into specificated format. 
if (stringDate == null || stringDate.length() == 0) {
    return "";
String pattern = getDateFormat(stringDate);
SimpleDateFormat formatter = new SimpleDateFormat(pattern);
if (timezoneIn != null) {
    formatter.setTimeZone(timezoneIn);
formatter.setLenient(false);
Date date = formatter.parse(stringDate);
formatter.applyPattern(patternToUse);
if (timezoneOut != null) {
    formatter.setTimeZone(timezoneOut);
return formatter.format(date);
StringconvertDateStringToString(String dateString, String format)
convert Date String To String 
SimpleDateFormat sdf = new SimpleDateFormat(format);
Date date = null;
String dateStr = "";
try {
    date = sdf.parse(dateString);
    dateStr = convertDateToStringByFormat(date);
} catch (ParseException e) {
    e.printStackTrace();
...
StringconvertDateStringToString(String strDate, String currentFormat, String parseFormat)
convert Date String To String 
try {
    return convertDateToString(convertStringToDate(strDate, currentFormat), parseFormat);
} catch (Exception e) {
    e.printStackTrace();
    return null;
StringconvertDatetimeFormat(Date tar_date, String date_format)
convert Datetime Format 
SimpleDateFormat sdf = new SimpleDateFormat(date_format);
sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
String formated_date = sdf.format(tar_date);
char last_char = date_format.charAt(date_format.length() - 1);
if (last_char == 'Z') {
    formated_date = formated_date.substring(0, formated_date.length() - 2) + ':'
            + formated_date.substring(formated_date.length() - 2, formated_date.length());
return formated_date;
StringconvertIso8601FormatToArsTime(String timeString)
Converts a string in ISO8601 Format into the string corresponding to an Ars internal time representation 
Date date = iso8601DateTimeFormatter.parse(timeString);
int secondsSinceEpoch = (int) (date.getTime() / 1000);
return String.valueOf(secondsSinceEpoch);