You are able to add holidays to your TM3 diary. For example, Christmas day, Boxing day and Easter etc.
You add these via the Diary section under TM3 settings.
Scroll down the page and you will see a Holiday Dates section.
To add a new holiday you simply click 'Add Holiday Date.' This brings up the screen below.
The next step would be for you to click on the calendar icon at the top right and this will pop up a calendar. It is at this point that you choose your holiday date, click ok and then click 'Add'.
The new holiday date we added now appears in our list.
The image below shows what the diary looks like on the date of the holiday.