Combine date and time into a single NSDate in Swift 3

combineDateAndTime.swift

//function to combine date and time from two different date objects.

func combineDateandTime(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 mergedComponments = DateComponents()
    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.date(from: mergedComponments)
}