Converting time

Write a program that converts a number of seconds into days, hours, minutes, and seconds. The output of your program must have the layout as in the following examples:

>>> %Run 
    Enter a number of seconds: 184
    The equivalent duration is 0:00:03:04.
>>> %Run 
    Enter a number of seconds: 6756456
    The equivalent duration is 78:04:47:36.
>>> %Run 
    Enter a number of seconds: -2
    Only positive values

To test your program, think about the inputs you want to use for the test cases and check the output by using the following converter:

https://www.convert-me.com/en/convert/time/second/second-to-dhms.html

In this way we are using another program to test the output of our program. The other program tells us what the expected results are, to compare them with the actual results of the program we are testing. In testing it is called an oracle.

The term oracle derives from the Latin oraculum that means the answer of a divinity to the questions that are posed to them. In testing, the question we ask is: what are the expected outputs of this program? A test oracle can be an existing system, a user manual, the exercise description, or the specialist knowledge of the programmer, but it should not be the code.

We invite the student to test their program more and compare their
outcomes with a parallel oracle that they can find on the web.
Moreover, we explain the terminology oracle.