'How to convert LIST of dates to single CronExpression?

Since I applied for internship I have to resolve this task: I need to create a method that turns list of dates to single CronExpression. Only Java code (no outside frameworks). Just like this :

Input:

    "2022-01-25 T 08:00:00"
    "2022-01-25 T 08:30:00"
    "2022-01-25 T 09:00:00"
    "2022-01-25 T 09:30:00"
    "2022-01-26 T 08:00:00"
    "2022-01-26 T 08:30:00"
    "2022-01-26 T 09:00:00"
    "2022-01-26 T 09:30:00"

Output:
    "0 0/30 8-9 * * *"

I have 2 questions:

  1. Is there any general (commonly used) way to do that? Or it is not typical task and I have to create that method from the zero?

  2. Can you explain me a logic of how I need to do that? Mainly I don't understand how to convert SEVERAL dates to one CronExpression.

javaspringcron


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