MediaWiki: workaround for watchlist restricted to 7 days?

I'm running MediaWiki 1.13.2. When I go to my watchlist, I'm limited to only viewing the last 7 days (though MediaWiki should permit me to view the last 30 days). I've tried:

1. Clicking the all button
2. Changing the URL
3. Changing the settings under MY PREFERENCES->WATCHLIST. When I save (e开发者_运维问答.g. 30 days) it resets back to 7 days!
4. Googling for an answer...

Anyone heard of this bug before? Is there a workaround? I can't see a setting anywhere for this to be a maximum.

Update: the solution below only affects Recent Changes - anyone know how to change the watch list? (Specifically, under MY PREFERENCES the Recent Changes now shows a maximum of 91 days but the watch list still shows a maximum of 7 days.)

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Prior to 1.16 (current version at time of writing) the default was 7 days. To change this you need to add this line to LocalSettings.php:

$wgRCMaxAge = 13 * 7 * 24 * 3600;

This will give a new maximum of 13 weeks. (Change the "13" in the code above to specify a different number of weeks.)

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You shouldn't forget the ; at the end of the code ;-)

 $wgRCMaxAge = 13 * 7 * 24 * 3600;

And with my MW installation (1.15.4) this did not help.

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Not really a programming question. Not sure what could be going on, though you may have some luck updating to a newer version of Mediawiki. Version 1.13.2 is nearly 2 years old.

Changing the days parameter in the url should show the the changes those number of days. http://www.yourwikidomain.org/w/index.php?title=Special:Watchlist&days=10