Java Utililty Methods Date ISO Parse

if (strDate == null) {
    return null;
} else {
    return parseDate(strDate, ISO_DATE);

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssz");
if (dateString.endsWith("Z")) {
    dateString = dateString.substring(0, dateString.length() - 1) + "GMT-00:00";
} else { 
    dateString = dateString.replaceFirst("-(\\d\\d)(\\d\\d)", "-$1:$2");
    int inset = 6;
    String s0 = dateString.substring(0, dateString.length() - inset);
    String s1 = dateString.substring(dateString.length() - inset, dateString.length());
...

try {
    return parseIso8601DateTime(datestr);
} catch (ParseException px) {
    return parseIso8601Date(datestr);

if (dateString == null)
    return (null);
if (!dateString.endsWith("Z")) {
    int lastColon = dateString.lastIndexOf(":");
    dateString = dateString.substring(0, lastColon) + dateString.substring(lastColon + 1);
return (ISO8601.parse(dateString));

SimpleDateFormat sdf = new SimpleDateFormat(iso8601TimeAndDatePattern);
try {
    return sdf.parse(dateString);
} catch (ParseException e) {
    e.printStackTrace();
return null;

SimpleDateFormat simpleDateFormat = new SimpleDateFormat(ISO8601_TS_FORMAT);
Date parsedDate = null;
try {
    parsedDate = simpleDateFormat.parse(dateString);
} catch (ParseException e) {
    throw new IllegalArgumentException(
            "Unable to parse " + dateString + " as ISO8601 datetime: " + e.getMessage(), e);
return parsedDate;

try {
    return new SimpleDateFormat(ISO_PATTERN).parse(asString);
} catch (final ParseException e) {
    throw new IllegalArgumentException(
            "Could not parse: " + asString + ", it does not match pattern: " + ISO_PATTERN, e);

return parseIsoDate(isoDateString, TimeZone.getDefault());

try {
    return getFormatter().parse(string);
} catch (final ParseException e) {
    throw new IllegalArgumentException("`" + string + "' is not a valid ISO date", e);

if (isBlank(date))
    return null;
try {
    SimpleDateFormat sdf = new SimpleDateFormat(ISO_DATE_FORMAT);
    return sdf.parse(date);
} catch (Exception e) {
return null;
...