get future / past time

[fukurou]

func getFutureInXMin(extra_minutes: Int) -> String {
          //  '''This method returns the date in x minutes'''
          
        if extra_minutes > 1440 {return "hmm"}
        let nowSum = getHoursAsInt()*60 + getMinutesAsInt()
        var dif = nowSum + extra_minutes
        if dif > 1440 {dif -= 1440}
        let minutes = dif % 60
        if minutes<10 {return "\(dif/60):0\(minutes)"}
        return "\(dif/60):\(minutes)"
        }

    func getPastInXMin(less_minutes: Int) -> String {
        if less_minutes > 1440 {return "hmm"}
        let nowSum = getHoursAsInt()*60 + getMinutesAsInt()
        var dif = nowSum - less_minutes
        if dif < 0 {dif = 1440 - dif}
        let minutes = dif % 60
        if minutes<10 {return "\(dif/60):0\(minutes)"}
        return "\(dif/60):\(minutes)"
    }