The notes and tasks you make on your farm are automatically tagged to the Farm Year of the map that is open. However, you can easily edit them to change the years as required.
Web
Select the task or job that you would like to be tagged to a different year.
Click "Edit".
Using the drop down menu you can change the year as required. The note or task will then be shown on the map and activity list of that year.
Mobile
Select the task or job that you would like to be tagged to a different year.
Tap "Edit", which is to the right of the the year tag.
Select the year as required from the list. The note or task will then be shown on the map and activity list of the tagged year.