Q) What is the correct way to say this Shabbat on Birchat Hachodesh, "Bayom Hashishi" or "Bayom Erev Shabbat Kodesh – Hava Alenu Letova"
A) Most recorded and printed luchos and guides mention "Bayom Hashishi" (Luach Davar Beito, Luach Meaggel Hashana – Minhagey S’kvere, et al.). However, Yerushatenu, an ample guide to Ashkenazi (German) minhagim quotes from Divrei Koheles, that the tradition of Kehilas Fulda was to announce; "Bayom Erev Shabbat Kodesh" (p. 131).
Most Rabbonim in this city answered that they say "Bayom Hashishi", a few, that maintain nusach s'fard (Chasidim), responded; "Bayom Erev Shabbat Kodesh".
Horav Shlomo Miller's Shlit"a opinion is to announce "Bayom Hashishi", as we normally say in Shir Shel Yom.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit"a
Important Numbers
