Conversion from TimeInterval Type to mm:ss.ff String Type

For example, the number timeInterval=124.04521142 is
02:04.04 I'd like to have a String type value of
Perhaps because I don't understand the format very well, I can see that it's a bit redundant even though I'm a beginner...

letmin=timeInterval/60
letsec=Int(timeInterval.truncatingRemainder(dividingBy:60))

let timeIntervalInteger=Int(timeInterval)
letdecimal=timeInterval-Double (timeIntervalInteger)
    // subtract only integers from the entire timeInterval and take only the decimal

letdecimalInteger=Int(decimal*100)
    // To remove the decimal "0.", round off the decimal point by 100 times

let minSec = String (format: "%02d:%02d%", min, sec)
    // First, put in mm:ss format

let miliSec=String (format: "%02d", decimalInteger)
    // Set milliseconds to ff format

var str = minSec + "." + miliSec

print(str)

I think it's a very roundabout way to subtract an integer part from timeInterval, multiply it by 100 times, and then add "%02d in the format "....

timeInterval should be treated as an integer increasing by one every 0.01 seconds in the timer, but what I want to deal with is the current playback time (currentPlaybackTime) of the song being played. I'm pulling it out as a TimeInterval type, so I want it to be a small number ->mm:ss.ff.