Github user Jaskey commented on the issue:
https://github.com/apache/incubator-rocketmq/pull/69
From java doc, 0 of `HOUR` is representing noon or midnight.
So this problem exists if we call the method after 12:am, the HOUR will
becomes 12 RATHER than 0, which may result in problems.
Good catch and nice job.
FYI:
you could try with different system clock, which will give you different
result.
Calendar cal = Calendar.getInstance();
cal.set(Calendar.DAY_OF_MONTH, 1);
cal.set(Calendar.HOUR, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MILLISECOND, 0);
System.out.println(new Date(cal.getTimeInMillis()));
System.out.println(cal.get(Calendar.AM_PM));
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