ExtraView maintains an accurate record of the date that each issue is closed. This is achieved by inserting the current system timestamp into the issue, when the issue is moved to the closed state. The closed state is defined by the behavior setting named STATUS_CLOSED_NAME. Its default value is CLOSED, but the administrator may change this. The value should only be changed during the implementation of a new system, as once data accumulates in a system, you will lose the historic references to when issues were closed, if you change this setting.
However, your workflow may (or may not) allow closed issues to be re-opened. The rules for setting the DATE_CLOSED date in the database are as follows:
Note: The field named DATE_LAST_STATUS_CHANGE always is initially set to the date that the issue is first created, and subsequently is only modified if the status changes value.