Convert seconds to compound duration

I may be wrong but I thought the point of these challenges was to implement such functions. But answering your question, I would create a zero NaiveDateTime and add seconds using the add function from this module.

Edit: In fact you can use Time and Time.add

The idea of exercise is not to make a compound date. That is merely a necessary step to make the exercise, like knowing how to add to numbers in order to calculate integrals in math.

So I was hoping I could skip this with a native function and actually focus on the core of the exercise itself.

I haven’t found a native implementation of this. But I had to do the same for my website just now.

I think you can accomplish the behavior by using rem and div.

hours = div seconds, 3600
minutes = div seconds, 60
seconds = rem seconds, 60

I haven’t comprehensively tested this to make sure there are no edge cases, but I think it should work

If you take 3661 seconds, that’s 1 hour, 1 minute, 1 second.

But div seconds, 60 is equal to 61.

I would write :

  def seconds_to_hours_minutes_seconds(seconds) do
    { div(seconds, 3600), rem(seconds, 3600) |> div(60),  rem(seconds, 3600) |> rem(60)}
  end

Also, I don’t think you can use NaiveDateTime easily, because you will soon get days, months and years. And if you use Time, it won’t work for durations above 24h, as you will get back to 0.