It is also advisable for you to re-read the content on your pages every few months. This may help to spot typing or grammatical errors. It also gives you a little time away from the information and you will more readily notice if something is missing from the page or needs to be removed from the page. When those dates arrive, remove the expired information or add the new information as expected. If the new information is still not available, revise the date given and mark that date on your calendar as well.
Some people prefer to schedule regular update periods.
For example, your department may decide that the web site will only be updated once a month. Even if information changes after the last update, that information is not posted on the web until the next scheduled update. This may help a department better schedule staff time for working on web updates. You should gauge this for your own web site. Some pages may have more time-critical information for which it is vitally important to get the word out as soon as possible.