I follewed the discussion about the Date values and at the same
    time I noticed that the 'user option restricted to only formats
    known to `format-time-string' function. The following patch will
    extend the variable gnus-article-time-format to accept a function
    symbol as well, so that user can have complete control over
    generated Date: field.

    In my case I prefer seeing the both lapsed time (without seconds) and
    the ISO date in the same field, like this after hitting W t s

	Date: 1 hour, 45 minutes -- 1998-02-09 12:08 Mon EET

    The patch makes this possible. (I have signed and returned 
    the Gnus disclaimer)

    Cheers!
    jari