Is Tomorrow Sunday?

Ever found yourself wishing you could tell the future? While we're not fortune-tellers, we can certainly help you with today's question: Is tomorrow Sunday? Let's delve into the world of days of the week and see how we can help you predict the future, at least until Saturday.

a young child is holding his hair in front of him with the words turn up on it
a young child is holding his hair in front of him with the words turn up on it

The answer to 'Is tomorrow Sunday?' is indeed a yes, if today is Saturday. However, since we don't have a crystal ball, let's explore how we can calculate this directly from any given day, shall we?

Flyer Design
Flyer Design

Understanding Days of the Week

First, let's understand the sequence of days in a week. It starts with Sunday and typically goes: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday. Notice how Sunday is the first day and Saturday is the last?

a lawn chair sitting in the grass with a cartoon dog on it's back
a lawn chair sitting in the grass with a cartoon dog on it's back

This might seem obvious, but it's a key point that helps us calculate whether tomorrow is Sunday.

The Simple Formula

Sunday is important!
Sunday is important!

Here's a simple formula to tell if tomorrow is Sunday. Let's say today is 'Day X'.

Day X + 1 = Day X+1%

  • If Day X+1% is Sunday, then tomorrow is indeed Sunday.
  • If not, then tomorrow is not Sunday.
a black and white poster with the words sunday night wait what? it's monday tomorrow
a black and white poster with the words sunday night wait what? it's monday tomorrow

The Modulo Operator

Now, let's make it more interesting with a concept called 'modulo'. In simple terms, 'modulo' gives you the remainder when one number is divided by another. For instance, 10 modulo 3 equals 1. In our case, we're interested in the modulo of our day number by 7.

The formula now looks like this:

a cat with its mouth open and the words oh no it's monday tomorrow
a cat with its mouth open and the words oh no it's monday tomorrow

Day X + 1 modulo 7

  • If the result is 0 (which it will be on a Saturday), then tomorrow is Sunday.
  • If not, then tomorrow is not Sunday, and you can calculate the day by referencing our initial list of days.
a worksheet with the words tomorrow is sunday in black and white, which are also
a worksheet with the words tomorrow is sunday in black and white, which are also
the words tomorrow will be written in black on a multicolored background with squares
the words tomorrow will be written in black on a multicolored background with squares
the words, see you sunday at church are shown in front of an image of trees
the words, see you sunday at church are shown in front of an image of trees
Sunday Memes, Pictures and Images for Funny Fundays!!
Sunday Memes, Pictures and Images for Funny Fundays!!
a person holding up a sign that says see you at church tomorrow in the sky
a person holding up a sign that says see you at church tomorrow in the sky
Good Friday to Resurrection Sunday
Good Friday to Resurrection Sunday
the words we wait to see you tomorrow are in front of an image of people raising their hands
the words we wait to see you tomorrow are in front of an image of people raising their hands
a sign that says, sunday? yes we are open
a sign that says, sunday? yes we are open
a gray cat peeking over the top of a blue blanket with its eyes wide open
a gray cat peeking over the top of a blue blanket with its eyes wide open
20 Sunday Night Memes That Sum Up The Weekend Ending
20 Sunday Night Memes That Sum Up The Weekend Ending

Calculating Day X

But what if you don't know today's day (Day X)? No worries, you can calculate that too. Since the sequence of days repeats every week, you just need to know the date and the day of the week it falls on.

For instance, if today is the 15th of the month and it's a Tuesday, then:

Day Modulo Result
Monday 1
Tuesday 2
Wednesday 3
Thursday 4
Friday 5
Saturday 6
Sunday 0

Given today is the 15th and a Tuesday, we calculate Day X as follows:

Day X = (15 - 1) modulo 7 = 7 modulo 7 = 0

Thus, today is Sunday, and tomorrow is indeed Monday.

So, there you have it. No more vague 'yes' or 'no' answers, you're now well-equipped to calculate whether tomorrow is Sunday or not, any day of the year. Happy planning!

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