Combine date and time into a single NSDate in Swift 2.0

combineDateWithTime

    func combineDateWithTime(date: NSDate, time: NSDate) -> NSDate? {
        let calendar = NSCalendar.currentCalendar()
        
        let dateComponents = calendar.components([.Year, .Month, .Day], fromDate: date)
        let timeComponents = calendar.components([.Hour, .Minute, .Second], fromDate: time)

        let mergedComponments = NSDateComponents()
            mergedComponments.year = dateComponents.year
            mergedComponments.month = dateComponents.month
            mergedComponments.day = dateComponents.day
            mergedComponments.hour = timeComponents.hour
            mergedComponments.minute = timeComponents.minute
            mergedComponments.second = timeComponents.second
    
        return calendar.dateFromComponents(mergedComponments)
    }

After multiple year it still is a very nice solution. Thanks

Swift 5 version, typo fixed and without force unwrapping:

func combineDateWithTime(date: Date, time: Date) -> Date? {
        let calendar = NSCalendar.current
        
        let dateComponents = calendar.dateComponents([.year, .month, .day], from: date)
        let timeComponents = calendar.dateComponents([.hour, .minute, .second], from: time)
        
        var mergedComponents = DateComponents()
        mergedComponents.year = dateComponents.year
        mergedComponents.month = dateComponents.month
        mergedComponents.day = dateComponents.day
        mergedComponents.hour = timeComponents.hour
        mergedComponents.minute = timeComponents.minute
        mergedComponents.second = timeComponents.second
        
        return calendar.date(from: mergedComponents)
    }

Genius! Thanks so much, you saved so much time for all of us!