Description of problem:
When I try to get list of active tasks which were activated since some specific date by calling method getActiveTasks(Date since) in SynchronizedTaskService, I get list of tasks which were created since that specific date and are now active.

It is caused by setting activation time to same time as is creation time. [1]

Version-Release number of selected component (if applicable):
6.1.0.ER6

How reproducible:
Start process with human task and start task. Call getActiveTasks(date) with date which is between time when task is created and when it is started.

Steps to Reproduce:
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Actual results:
getActiveTasks returns empty list

Expected results:
getActiveTasks should return list with task which was started after specified date

Additional info:

[1] https://github.com/droolsjbpm/jbpm/blob/master/jbpm-human-task/jbpm-human-task-jpa/src/main/java/org/jbpm/services/task/impl/model/TaskDataImpl.java#L388