Calendar day
Okay, imagine you have a big paper with empty squares on it. Each square represents a day. When you wake up in the morning, you can put a little sticker on the square of that day.
So, one day would be Monday, another would be Tuesday, and so on. Those are the calendar days. When all the squares are filled with stickers, it means that a month has passed.
If you want to count how many days it takes to finish a task, you can count the days from the day you start until the day you finish, and that would be the number of calendar days it took you to complete it. It's like counting the number of squares you put a sticker on.
So, one day would be Monday, another would be Tuesday, and so on. Those are the calendar days. When all the squares are filled with stickers, it means that a month has passed.
If you want to count how many days it takes to finish a task, you can count the days from the day you start until the day you finish, and that would be the number of calendar days it took you to complete it. It's like counting the number of squares you put a sticker on.