I found the origin Resolved date is the same as created date. It would be update if developer change the status to resolved. It seems work fine. But if QA member reopen this issue, the resolved date would not be update even if the issue's status would be changed to resolved after developer fixed it. So I have some trouble in searching an issue list which dev team fixed today.
Resolved date is set when you set or change the resolution. It will be cleared when you clear your resolution (i.e. in a postfunction). See also:
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