code: public QueryChangesetsFilters byOpenSomeTimeBetween(Date createdBefore, Date closedAfter)
  	{
  		params.put("time", dateFormat.format(closedAfter) + "," + dateFormat.format(createdBefore));
  		return this;
  	}
docs: Filter by changesets that have at one time been open during the given time range
  
  @param closedAfter limit search to changesets that have been closed after this date
  @param createdBefore limit search to changesets that have been created before this date