You're seeing just the function call_crontab, go back to CandleClock module for more information.
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call_crontab(mfa, crontab, timezone \\ "Etc/UTC", opts \\ [])

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call_crontab(mf_args(), String.t(), String.t(), keyword()) ::
  {:ok, struct()} | {:error, any()}

Creates a timer that is executed according to the given crontab schema.

Returns the timer in an ok-tuple if successful.