Currency can be tricky. Depending on the topic and the research goal, copyright date may or may not be an adequate indicator of currency. Consider the natural flow of information from the time that events happen to the time which they are published as general knowledge:
Breaking news, occuring within days and sometimes minutes of an event offers immediately information. That information can provide valuable insight into personal experience and specific details. In many ways breaking news functions as a primary source of information.
On the other hand, the farther the source is from an event, geographically or chronologically, the greater the opportunity for analysis.
Documentaries, scholarly journals, and books, with months and sometimes years of research behind them, provide more complete but less current information.
Everyday individuals of various levels of expertise publish new information and new interpretations of information. At the same time, libraries, museums, and other organizations are digitizing existing information and making it available online. The open nature of publishing information to the web makes resources located here fall anywhere within the continuum of currency (and credibility).