Getting wrong month when using SimpleDateFormat.parse

Question

In my programm there is a very strange problem. Here you can see String birthday and Log to check it:

birthday = String.valueOf(birthYear) + "-" + String.valueOf(birthMonth) + "-" + String.valueOf(birthDay);
Log.i(TAG, "Birthday: " + birthday)

Then I put it to SimpleDateFormat and check it with the Log:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");

Date birthDate = sdf.parse(birthday);
Log.i(TAG, "Birth date  : " + birthDate);

And then in Logcat I have:

I/App﹕ Birthday: 1999-10-15
I/App﹕ Birth date: Fri Jan 15 00:10:00 GMT+04:00 1999

So as you see in the date it is Jan, but in the String it is 10 so date should look like:

Fri Nov 15 00:10:00 GMT+04:00 1999

Where is my mistake?

P.S I think my question is somehow connected with Getting wrong data when using SimpleDateFormat.parse()

Answer 1

Use:

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Use MM for month, mm for minutes as stated by documentation...

If you want to print a Date in a specific format, you should use:

 sdf.format(birthday)

or another SimpleDateFormat if you want to pring it in a different format...

Answer 2

I faced the same issue and I found the error now. We should use MM for month, mm for minutes and dd for day. Using DD changed my date to wrong month, so I used dd for day and so final format I used is yyyy-MM-dd.