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At 23:55 PM EDT on May 20th, I ran misc/generateVisits.php. Looking in piwik_log_visit, the visits were generated for May 21st and May 22nd.
(daysToCompute is 1)
To override default behaviors of a visit a subclass of /core/Tracker/Visit.php has been created : /core/Tracker/Generator/Visit.php.
This extension allows a fake generated timestamp to be assigned to a visit. In order to do so, an overridden method has been created in /core/Tracker/Generator/Visit.php : 33
protected function getCurrentTimestamp()
self::$timestampToUse = max(@$this->visitorInfo['visit_last_action_time'],self::$timestampToUse);
self::$timestampToUse += mt_rand(4,1840);
In /core/Tracker/Visit.php : 226, 254, 290, 356, 427, 572, 773 and 804, the method getCurrentTimestamp() is called.
The method getCurrentTimestamp() of class /core/Tracker/Visit.php is supposed to be an accessor method and not a computational one. Each call of the overridden method getCurrentTimestamp() of class /core/Tracker/Generator/Visit.php computes a new timestamp instead of reusing the first generated one. Because of those unnecessary increments, the time goes too much ahead.
Proposal: Remove the time increment from getCurrentTimestamp() and add a generateTimestamp() method. I have attached a patch to solve this issue. I have decided to access this method from /core/Tracker/Generator/Tracker.php after the creation of the visit. It could be done in the constructor of /core/Tracker/Generator/Visit.php.
(In ) Fixes #1369 Thanks JulienM!