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The problem seems to be when a 1-digit day is used in the
<pubDate> tag

e.g. Thu, 3 March 2005 21:30:07 +0000

In this case, the current timestamp is used.

When a 2-digit day is used in the <pubDate> tag

e.g. Thu, 10 March 2005 21:30:07 +0000

the date of publication is correctly used.