Questions about the Heroes 4 map editor.

Dear experts, I am new to mapmaking and I really hope for your help. I want to write a script so that after two days, let's say, after a hero captures a castle, a specific message appears. I create a calendar event in the map properties for the first day. I set a numerical variable called "castle" in it. Then, in the standard events of this castle - capture - I assign the value of the current day to the "castle" variable. Then, again in the map properties, in the repeating events, I create a conditional action. If the current day is equal to "castle" + 2, then show a message. But nothing happens. I am waiting for an answer. Thank you in advance.