Calculating the day of the week

Have you ever wondered how our parents or teachers know which day it is just by looking at a calendar? Well, they use a special trick called calculating the day of the week. It helps them figure out what day it was, what day it is and what day it will be.

To do this, we need to break down the number of days into a group of seven days. We call these seven days a week! And we give them special names: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.

Let's start by counting the number of days between two dates. For example, if we want to know how many days are there between 1st January and 15th January, we count 15 days. Next, we divide 15 by 7 (the number of days in a week) to see how many "full" weeks are in there, and we get two.

Now we take the remaining days (15 - 7 x 2 = 1) and start counting from the initial day (in this case, 1st January). We count that one remaining day, and we know that it will be Tuesday. Why? because the 1st of January is a Monday, and one day after Monday is Tuesday. So, 15th January is a Tuesday.

We can also use this method to calculate the day of the week for any past, present, or future date. But we must always remember to adjust the year by adding or subtracting one year if it's a leap year (with an extra day in February) between the two dates.

In summary, calculating the day of the week is like counting the number of weeks from the starting date, finding the remaining days, and then counting the days from that date to determine the day of the week. It takes practice, but even a five-year-old can use this trick to figure out what day it is.