Emacs 21.1 w2k: format-time-string %b is different than in 20.7

[Jari Aalto+mail.emacs]

I was suprised to see my dired.el listing ragged in Emacs 21.1 and
I traced the cause to the ls-lisp.el, which in function
`ls-lisp-format-time' uses  `format-time-string'. Here are two set
of test, both in the same w2k Pro

Emacs 20.7

    (format-time-string "%b %e %H:%M" (current-time))
    "Jan  5 12:55"
    ====

    C-h f  format-time-string:       
    %b and %h are the locale's abbreviated month name, %B the full name.

Emacs 21.1

    (format-time-string "%b %e %H:%M" (current-time))
    "tammi  5 12:56"
    ======

    C-h f format-time-string:
    %b and %h are the locale's abbreviated month name, %B the full name.

My current locale in W2k "Regional Options" is "Finnish", because
it is the only way to use keyboard correctly.

But I do not want to see the month names in "finnish", because they
are not abbreviated to 3 letters (like in output above).

Is there any way to force Emacs use different locale settings and
have format-time-string display Months and other time related
names in english?

Jari