Hmmm. We definitely recognize the anniversary dates here in the US as August 6th and August 9th. With the International Date Line being where it is:

http://aa.usno.navy.mil/faq/docs/international_date.html

Japan is one day ahead of us at that time.

>I'm not sure about that, memorial ceromonies are held on the 6th & 9th August in Hiroshima & Nagasaki :
>
>http://www.gensuikin.org/english/photo.html
>
>Survivors account :
>
>http://www.csi.ad.jp/school/project/nagatuka/a-bomb1.html