Lintian tag information: invalid-date-in-debian-changelog (type: error)

Description (from lintian-explain-tags)

The date format in the latest changelog entry file appears to be invalid.

Dates should use the following format (compatible and with the same
semantics of RFC 2822 and RFC 5322):

day-of-week, dd month yyyy hh:mm:ss +zzzz

To avoid problems like this, consider using a tool like dch(1) or date(1)
to generate the date. Example:

$ date -R -ud '2013-11-05 23:59:59'
Tue, 05 Nov 2013 23:59:59 +0000

Please refer to Debian changelog: debian/changelog (Section 4.4) in the
Debian Policy Manual for details.

Visibility: error
Show-Always: no
Check: debian/changelog

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