[hafthor]

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

[bassman9000]

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.

[adamvoncorswant]

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'?

[lstamour]

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

[adamvoncorswant]

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