Get the soonest date from a list of dates

soonestDate

extension NSDate
{
    /**
        Checks if the date is in the past.
        
        :returns: If date is passed or not
    */
    func inPast() -> Bool
    {
        let now = NSDate()
        
        if self.laterDate(now) == now
        {
            return true
        }
        
        return false
    }
}

/**
    Returns the soonest date in a list of dates.
    
    :param: dates One or more NSDate objects.

    :returns: NSDate, which is the closest to now.
*/
func soonestDate(dates: NSDate...) -> NSDate
{
    var soonest: NSDate!
    
    for date in dates
    {
        if soonest != nil
        {
            soonest = date.earlierDate(soonest)
        }
        else
        {
            soonest = date
        }
    }
    
    return soonest
}

/**
    Returns the soonest date(s) in a list of dates.

    :param: dates One or more NSDate objects.

    :returns: NSDate(s), which is/are the closest to now.
*/
func soonestDates(dates: NSDate...) -> [NSDate]?
{
    var soonest: [NSDate]!
    
    for date in dates
    {
        if date.inPast()
        {
            continue
        }
        
        if soonest != nil
        {
            if (soonest.first!.isEqualToDate(date))
            {
                soonest.append(date)
            }
            else if (soonest.first!.earlierDate(date) == date)
            {
                soonest = [date]
            }
        }
        else if (!dates.first!.inPast())
        {
            soonest = [date]
        }
    }
    
    return soonest
}