<a href="http://in.reuters.com/article/2012/06/08/entertainment-us-japan-music-akb-idINBRE85702L20120608"><a href='http://in.reuters.com/article/2012/06/08/entertainment-us-japan-music-akb-idINBRE85702L20120608' target='_blank' rel='nofollow'>http://in.reuters.com/article/2012/06/08/entertainment-us-japan-music-akb-idINBRE85702L20120608</a> </a><br/><b>The song, which retailed at 1,600 yen ($20), sold more than a million copies <span style="background-color:#ff9900;">in its first day</span>.</b><br/><br/>Is it wrong to say "<b>on</b> its first day" instead of <span style="background-color:#ff9900;">in its first day</span>?