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From: Marc Mientki <mientki@nonet.com>
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Subject: Re: help create function alias
Date: Mon, 20 Sep 2010 12:57:01 +0200
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Am 20.09.2010 12:43, schrieb Adam:
> (defun id ()
>     "insert date"
>     (interactive "P")
>     (insert-date t))
>

There two errors:

1. You say (interactive "P") but not provide argument to id.
When you use "P", then you must write:
(defun if (arg) ...

or

(defun if (&optional arg) ...

But actualy you don't need "P" in your example. So you can write:

(defun id ()
    "insert date"
    (interactive)
    (insert-date t))

2. Function insert-date is not defined, at least not in my emacs.

HTH
Marc