To dream of a calendar represents your awareness of the passing of time or waiting for something. Noticing how long something takes. The dream may be a sign that you are waiting for a special event, appointment, or important date in the future.
Alternatively, a calendar may reflect your anxieties about the future or your feeling that time is running out in some area of your life.
Example: A woman dreamed of seeing her boyfriend pointing at a calendar. In real life her boyfriend was in jail and she was patiently waiting for him to get released.
Example 2: A few days after the 911 attacks on the WTC building a woman dreamed of being inside the WTC building and being unable to find to find out the date. In waking life she was watching the news every day and was nervous about any signals from the government that war was coming. Her wish to find and know the date reflected her wish to get closure about whether it not “it was time” for the government to go to war.