Updating Information Everyday

I'm making an app that displays three different numbers everyday. The number depends on the current date and two other integers given by the user. Each of the three numbers has their own label and everyday I want the label to change to display that days number. I've written each equation to calculate the number in its own function. (one function is used as an example below this). I've tried editing the AppDelegate in the "ApplicationDidEnterForeground" func to update the labels (function also shown below) but it did not work. Any help would be appreciated as this would be my first app. (My variables are named the same as parameters in the functions)

Equation to Calculate One of The Numbers

 // Intellectual Equation
func intellect(pi: Double, age: Double, daysSinceBday: Double) -> Int {
    let intellectEq = 50.00 * sin((2.00*pi/28)*((age)*365.25) + daysSinceBday) + 50.00
    print(intellectEq)
    let intellectualAsString = intellect(pi: pi, age: age, daysSinceBday: daysSinceBday)
    self.IntellectualLabel.text = "\(intellectualAsString)"
    return intellectualAsString
}

Function to Update Labels

  func getCurrentEquationData(pi: Double, age: Double, daysSinceBday: Double) {
        intellect(pi: pi, age: age, daysSinceBday: daysSinceBday)
}

In the AppDelegate, I called:

getCurrentEquationData(pi: pi, age: age, daysSinceBday: daysSinceBday)