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From: Cecil Westerhof <dummy@dummy.nl>
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Subject: Re: How to get hours from hh:mm
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Alexis Roda wrote:
> Something like this could be helpful:
> 
> (defun time100(time)
>    (let ((timelist (split-string time ":")))
>      (+ (string-to-number (car timelist))
>         (/ (string-to-number (cadr timelist))
>            60.0))))

I tried this:

(defun getMinutes(time)
  (interactive "sDuration: ")
  (let ((timelist (split-string time ":")))
    (+ 
      (string-to-number (car timelist))
      (/ 
        (string-to-number (cadr timelist))
        60.0
      )
    )
  )
)

When I dan give M-x getMinutes and on the prompt give: 00:18, I get:
        Symbol's function definition is void: let