Hi friends:<br/>I saw a sentence as below --<br/><br/><span style="color:rgb(255,0,0);">"The Online Privacy Protection Act, effective July 1, 2000, applies to the online collection of personal information from people under 18."</span><br/><br/>And I'm confused by the usage of the word<i><b> effective</b></i>; it looks like a <b>preposition</b> is missing!<br/>Am I right?<br/><br/>I consider that the correct usage should be either <span style="color:rgb(0,0,255);">"effective from July 1, 2000"</span> or <span style="color:rgb(0,0,255);">"effective on July 1, 2000"</span>.<br/><br/>Please advise, thank you!