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Java:

new java.text.SimpleDateFormat("YYYY-MM-dd").parse("2018-12-30") returns Sun Dec 31 2017

new java.text.SimpleDateFormat("YYYY-MM-dd").format(new java.util.Date("12/30/2018")) returns 2019-12-30

java.time from Java8 also affected.

java.time.format.DateTimeFormatter.ofPattern("YYYY-MM-dd").format(java.time.LocalDate.parse("2018-12-30")) returns 2019-12-30

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Javadoc uses yyyy for year since at least 1.5

https://docs.oracle.com/javase/1.5.0/docs/api/java/text/Simp...

I've never seen YYYY used in Java.

Isn't it fun that while we're all discussing 'yyyy' vs 'YYYY', it sees like we're missing out that what everyone actually should use most of the time is rather 'uuuu'?

uuuu appears to be Java-specific: https://stackoverflow.com/questions/41177442/uuuu-versus-yyy...

Yes, indeed so. That's why I answered in the java thread. Sorry for not making that clear.

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