Properly dated refers to something that has been given the correct date in a clear and accurate manner. Some synonyms for this term include accurately dated, correctly dated, precisely dated, and appropriately dated. Another synonym for properly dated could be well-documented, indicating that the date has been recorded or noted clearly and effectively. Other related terms might include dated correctly, precisely labeled, or accurately recorded, all of which could be used to convey a similar meaning. Regardless of the specific term used, the idea behind properly dated is to ensure that something has been given a correct and reliable date that can be trusted for future reference.