Java Utililty Methods Date ISO Parse

String pattern;
StringBuffer buffer = new StringBuffer(date);
switch (buffer.length()) {
case 4:
    pattern = "yyyy";
    break;
case 7:
    pattern = "yyyy-MM";
...

Date date;
try {
    date = ISO_DATETIME_FORMAT.parse(str);
    if (formatIsoDateTime(date).equals(str)) {
        return date;
} catch (ParseException e) {
try {
    date = ISO_DATE_FORMAT.parse(str);
    if (formatIsoDate(date).equals(str)) {
        return date;
} catch (ParseException e) {
return null;

SimpleDateFormat iso8601format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssX");
try {
    return iso8601format.parse(s);
} catch (Exception e) {
    return null; 

String tempDateValue = aDateString;
if (tempDateValue == null) {
    tempDateValue = "1970-01-01";
String tempTimeValue;
if (aTimeString == null) {
    tempTimeValue = "T00:00:00.000";
} else {
...

GregorianCalendar c = new GregorianCalendar();
c.setTime(isoDateFormatter.parse(str));
return c;

if (isoDateTime.length() == 0)
    return new Date(0L);
DateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
df.setTimeZone(TimeZone.getTimeZone("UTC"));
Date date = df.parse(isoDateTime);
return date;

float[] values = new float[7];
int index = 0;
if (duration.charAt(index) == '-') {
    values[0] = -1;
    index++;
} else {
    values[0] = 1;
if (duration.charAt(index) == 'P') {
    index++;
} else {
    throw new ParseException("missing 'P' designator at [" + index + "]", index);
char designator;
int offset;
int slot;
boolean time = false;
boolean pending = false;
String value = null;
while (index < duration.length()) {
    designator = duration.charAt(index);
    if (designator == 'T') {
        time = true;
        index++;
        continue;
    if (isDesignator(designator)) {
        if (!pending) {
            throw new ParseException("missing value at [" + index + "]", index);
        slot = getDesignatorSlot(designator, time);
        try {
            values[slot] = getDesignatorValue(designator, value);
        } catch (NumberFormatException e) {
            throw new ParseException("malformed value at [" + (index - value.length()) + "]",
                    (index - value.length()));
        pending = false;
        index++;
        continue;
    offset = getNumberOffset(duration, index);
    if (offset == index) {
        throw new ParseException("missing value at [" + index + "]", index);
    if (offset == duration.length()) {
        throw new ParseException("missing designator at [" + offset + "]", offset);
    value = duration.substring(index, offset);
    index = offset;
    pending = true;
return values;

return isoFormat.parse(time).getTime();

SimpleDateFormat f = new SimpleDateFormat(TIMESTAMP_FORMAT_ISO8601, Locale.US);
f.setTimeZone(TimeZone.getDefault());
return f.parse(timestamp);

if (date == null) {
    return false;
} else {
    try {
        parseIso8601Date(date);
        return true;
    } catch (ParseException e) {
        return false;
...