- AbstractProcessInstanceDurationGroupByStartDateCommand returns system default compliant date histogram buckets instead of UTC buckets
- no explicit UTC usage in any dateHistrogram related tests
- use default timezone also when creating histogram buckets not only when formatting the result (to avoid +1 hour workarounds when formatting expected dates in tests)
Right now, we have several tests where we set the time zone to UTC, which does not makes sense and is hard to understand, e.g.:
considering we do that in ProcessInstanceDuration* related tests but for instance not in tests for CountProcessInstanceFrequency*.