SimpleDateFormat convert date incorrect return value when hour is 12 [duplicate]

Answer 1

That happens because you are using SimpleDateFormat which is by default lenient. If you turn leniency off by setting setLenient(false):

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss.SSSZ", Locale.getDefault());
dateFormat.setLenient(false);

You will get an exception saying:

java.text.ParseException: Unparseable date: "2017-07-19T13:43:42.000+0000"

The root cause here is that you are submitting 13 for hours which requires HH pattern instead of hh. Because of leniency your code silently fixes the date instead of throwing an exception.

H Hour in day (0-23)

h Hour in am/pm (1-12)

Answer 2

Aside from the fact you shouldn't be using Date or SimpleDateFormat any more, your error is because you are using hh instead of HH

h -> Hour in am/pm (1-12)

H -> Hour in day (0-23)

Consider using LocalDateTime in your case.