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

DateconvertDateToUTC(Date date)
Returns a new Date converted to UTC 
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int gmtMillisecondOffset = (calendar.get(Calendar.ZONE_OFFSET) + calendar.get(Calendar.DST_OFFSET));
calendar.add(Calendar.MILLISECOND, -gmtMillisecondOffset);
return calendar.getTime();
doubleconvertDateToWindowsTime(Date javaDate)
converts a java date to a windows time object (is this timezone safe?) 
if (javaDate == null) {
    throw new IllegalArgumentException("cannot convert null to windows time");
return convertMillisecondsToWindowsTime(javaDate.getTime());
longconvertDateValueToMillis(TimeZone tz, long dateValue)
Convert an encoded date value to millis, using the supplied timezone. 
return getMillis(tz, yearFromDateValue(dateValue), monthFromDateValue(dateValue),
        dayFromDateValue(dateValue), 0, 0, 0, 0);
DateconvertDoubleTimeToDate(Number d)
convert Double Time To Date 
if (d == null) {
    return null;
int m;
if (d.doubleValue() < 0) {
    m = (int) (((long) (d.doubleValue() * DAY_MILLIS - 0.5)) % DAY_MILLIS);
} else {
    m = (int) (((long) (d.doubleValue() * DAY_MILLIS + 0.5)) % DAY_MILLIS);
...
CalendarconvertFromFileman(String date)
convert From Fileman 
return date == null ? null
        : new GregorianCalendar(Integer.parseInt(date.substring(0, 3)) + 1700,
                Integer.parseInt(date.substring(3, 5)) - 1, 
                Integer.parseInt(date.substring(5, 7)));
StringconvertInputDateToString(Date inputDate)
convert input date to String 
String strDate = "";
Calendar c = Calendar.getInstance();
if (inputDate.equals(null)) {
    inputDate = new Date();
c.setTime(inputDate);
strDate = c.get(Calendar.DATE) + "/" + (c.get(Calendar.MONTH) + 1) + "/" + c.get(Calendar.YEAR);
return strDate;
...
DateconvertInt2Date(int date)
convert Int Date 
Long x = Long.valueOf(date) * 1000;
Calendar c = Calendar.getInstance();
c.setTimeInMillis(x);
return c.getTime();
DateconvertIntToDate(final int iDate)
Converts an integer time in the form of YYYYMMDD to the proper Date 
if (iDate == 0) {
    return null;
calendar.clear();
int year = iDate / 10000;
if (year > 1700) {
    int tmp = (iDate - (year * 10000));
    int month = tmp / 100;
...
DateconvertIntToDate(final int iDate, final StringBuilder verbatimDate)
Converts an integer time in the form of YYYYMMDD to the proper Date 
calendar.clear();
int year = iDate / 20000;
if (year > 1600) {
    int tmp = (iDate - (year * 20000));
    int month = tmp / 100;
    int day = (tmp - (month * 100));
    if (month == 0 || day == 0) {
        verbatimDate.setLength(0);
...
DateconvertLocalDateToUTCDate(Date localDate)
convert Local Date To UTC Date 
Calendar cal = Calendar.getInstance();
int tzOffset = cal.get(Calendar.ZONE_OFFSET);
TimeZone tz = cal.getTimeZone();
if (tz.inDaylightTime(localDate)) {
    tzOffset += cal.get(Calendar.DST_OFFSET);
Date UTCDate = new Date();
UTCDate.setTime(localDate.getTime() - tzOffset);
...