[Tickets #13409] IMP dies on bad date headers

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Ticket URL: http://bugs.horde.org/ticket/13409
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  Ticket             | 13409
  Created By         | bra at fsn.hu
  Summary            | IMP dies on bad date headers
  Queue              | IMP
  Version            | 6.1.7
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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bra at fsn.hu (2014-07-31 14:59) wrote:

I have a user, converted from another mail application to Horde, who  
complains about not being able to read his mails.
When he tries to access some of them, he gets server communication error.

The following are in the logs:
Jul 31 16:47:26 wm Webmail: [imp] PHP ERROR: strftime() expects  
parameter 2 to be long, string given [pid 79051 on line 178 of  
"/usr/local/www/webmail/web/imp/lib/Message/Ui.php"]
Jul 31 16:47:26 wm Webmail: PHP Fatal error:  Call to a member  
function format() on a non-object in  
/usr/local/www/webmail/web/imp/lib/Message/Ui.php on line 181

Putting some debug syslogs around this code it seems  
$this->_envelope->date becomes an empty string when the date header is  
invalid.
Two examples from the user's folder:
Date: Tue, 22 Oct 2013 19:02:07 +0200 (GMT+02:00)
Date: Wed, 02 Jul 2014 05:18:27 UT

If I correct these headers to be RFC conform, the messages can be read.
Thunderbird and other clients can show these correctly.