Prevent invalid date from getting converted into date of next month in jdk6?

Question

Consider the snippet:

String dateStr = "Mon Jan 32 00:00:00 IST 2015";    // 32 Jan 2015

DateFormat formatter = new SimpleDateFormat("E MMM dd HH:mm:ss Z yyyy");
DateFormat ddMMyyyy = new SimpleDateFormat("dd.MM.yyyy");
System.out.println(ddMMyyyy.format(formatter.parse(dateStr)));

gives me the output as

01.02.2015     //   Ist February 2015

I wish to prevent this to make the user aware on the UI that is an invalid date?
Any suggestions?

possible duplicate of [How to sanity check a date in java](http://stackoverflow.com/questions/226910/how-to-sanity-check-a-date-in-java) — Jens, Jun 01 '15 at 13:22
@Jens: The main problem is that how will I get dd.MM.yyyy format with Calendar class and then do the stuff with setLenient method. — Farhan Shirgill Ansari, Jun 01 '15 at 13:23
Where possible avoid the java `Date` classes. Use http://www.joda.org/joda-time/ for Java 7 and older, and Java Time in Java 8. — Thirler, Jun 01 '15 at 13:23

TimoStaudinger · Accepted Answer · 2015-06-01T13:29:33.690

3

The option setLenient() of your SimpleDateFormat is what you are looking for.

After you set isLenient to false, it will only accept correctly formatted dates anymore, and throw a ParseException in other cases.

String dateStr = "Mon Jan 32 00:00:00 IST 2015";    // 32 Jan 2015

DateFormat formatter = new SimpleDateFormat("E MMM dd HH:mm:ss Z yyyy");
formatter.setLenient(false);
DateFormat ddMMyyyy = new SimpleDateFormat("dd.MM.yyyy");
try {
    System.out.println(ddMMyyyy.format(formatter.parse(dateStr)));
} catch (ParseException e) {
    // Your date is invalid
}

edited Jun 01 '15 at 13:29

answered Jun 01 '15 at 13:24

TimoStaudinger

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2

Should that be `setLenient(false)` to be strict – Brett Walker Jun 01 '15 at 13:25
@TimoSta: No, this didn't solved the problem. I am still getting the same answer. – Farhan Shirgill Ansari Jun 01 '15 at 13:26
@BrettWalker Correct, it should be false – TimoStaudinger Jun 01 '15 at 13:27
@ShirgillAnsari Have a look at my edit. It should be set to false instead of true as Brett Walker pointed out. – TimoStaudinger Jun 01 '15 at 13:27
@TimoSta: Did you try with String dateStr = "Mon Jan 30 00:00:00 IST 2015"; In this case, it must not fail, but an unparseable exception is thrown. – Farhan Shirgill Ansari Jun 01 '15 at 13:32
@TimoSta: It's fine TimoSta. Jan 30 is not Monday. How can I be so stupid this evening? – Farhan Shirgill Ansari Jun 01 '15 at 13:38

score 2 · Answer 2 · answered Jun 01 '15 at 13:25

2

You can use DateFormat.setLenient(boolean) to (from the Javadoc) with strict parsing, inputs must match this object's format.

DateFormat ddMMyyyy = new SimpleDateFormat("dd.MM.yyyy");
ddMMyyyy.setLenient(false);

answered Jun 01 '15 at 13:25

Elliott Frisch

191,680
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score 1 · Answer 3 · answered Jun 01 '15 at 13:26

1

Set the date formatter not to be lenient...

DateFormat formatter = new SimpleDateFormat("E MMM dd HH:mm:ss Z yyyy");
formatter.setLenient(false);

answered Jun 01 '15 at 13:26

Phil Anderson

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Prevent invalid date from getting converted into date of next month in jdk6?

3 Answers3