gistfile1.swift

func addSectionToTimeline(sectionInfo: OverviewSectionInfo, dateFormat: String, inout dates: [String], inout keyDate: String) {
        let dateFormat = "MMM d"
        let dateString = sectionInfo.entity.displayDate.dateString(dateFormat)
        
        if (dateString != keyDate) {
            keyDate = dateString
            dates.append(dateString)
        }
        
        if (sectionInfo.isOpen) {
            for activity in sectionInfo.activities {
                let activityDate = activity.displayStartDate!.dateString(dateFormat)
                if (activityDate != keyDate) {
                    if (sectionInfo.isOpen) {
                        keyDate = activityDate
                        self.timeline[activity.primaryKey] = [activityDate]
                    } else {
                        dates.append(activityDate)
                    }
                }
            }
        }
}