Fastest way to get hour of java.util.date?

Question

When starting from ajava.util.date object: what is the best way getting the hour part as an integer regarding performance?

I have to iterat

Answer 1

In UTC:

int hour = (int)(date.getTime() % 86400000) / 3600000;

or

 long hour = (date.getTime() % 86400000) / 3600000;

Answer 2

Date dateInput = new Date();

since calendar starts at 01.01.1970, 01:00. you have to make further modifications to the code.using below approach avoids that so this will performs faster.

dateInput.toInstant().atZone(ZoneId.systemDefault()).getHour();