Mondays or Monday’s or Mondays’? Here’s The Correct Possessive

Words that end in S can cause a bit of confusion. Many will be wondering whether or not to include the comma. And the word that I want to focus on today is Monday. Should we be saying “Mondays” or “Monday’s”?

Mondays or monday’s?

More than one Monday is “Mondays” but something that belongs to Monday is “Monday’s”. The apostrophe goes with possessives, but not with plurals. You can also say “Monday’s” as a shortening of “Monday is”.

This rule also applies for ALL other week days, in case you’ve searched for:

  • Tuesdays or tuesday’s
  • Wednesdays or wednesday’s
  • Thursdays or thursday’s
  • Fridays or friday’s
  • Saturdays or saturday’s
  • Sundays or sunday’s
Singular possessiveMonday’s
Plural possessiveMondays’
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Mondays or monday’s – 4 Examples

When used as a plural, you would say “Mondays”.

“I hate Mondays”.

When used as a contraction of “Monday is” you would say “Monday’s.”

“Monday’s rubbish.”

When used as a possessive, you would say “Monday’s.”

“Monday’s episode was rubbish”.

When using a plural and a possessive, you would say “Mondays'”

“Mondays’ episodes are always rubbish”.

I want to take a look at what the rules for apostrophes are, where “Monday” comes from, and why everyone hates it so much!

Rules of the apostrophe

Let’s start off by taking a look at what the rules of the apostrophe are. All of these can be applied to the word “Monday”.

The first use of the apostrophe is when contracting words. For example, instead of saying “I am”, I could just say “I’m”. Instead of saying “Monday is” I can just say “Monday’s”.

You can also use an apostrophe when talking about possessives. For example, “Monday’s episode was rubbish!”. This is to say that the episode which belongs to Monday wasn’t very good.

When showing possession with a word that has been pluralized, you add the apostrophe after the S.

So if there is a show that always shows bad episodes on Monday, I might say “Mondays’ episodes are always rubbish!”.

Origin of the word “Monday”

The days of the week have been with us for so long, most of us don’t think about what they mean, or where they come from.

The word “Monday” was changed from the Middle English “Monedai”. Which came from the Old English “Mondoeg”.

This literally meant “moon day” or “day of the moon”. We really do have a whole day named after that big round thing we see in the sky in the evening.

Monday + Sunday vs the other days

Monday and Sunday are different from the other days of the week. Most of them are named after ancient gods, whereas, Monday and Sunday are named after things in the sky.

Tuesday is named after Tiw, Norse god of war. Wednesday is named after Woden, Norse head god. Thursday’s named after Thor, Norse god is lightning. And Friday is named after Freya, Norse god of fertility.

Saturday is named after Saturn, but not the planet. Saturn was the Greek (not Norse) god of abundance. The planet was also named after him.

Interesting that the day of being lazy is named after the god of abundance.

Why don’t we say “Mondaies”?

Other words that end in Y have the Y replaced by IES when pluralized. For example, we would have one fry but two fries. One baby but two babies.

Not all words that end in Y become IES. Only some of them.

If the letter before the Y is a vowel, just add an S. Mondays, 50 greys.

But if the letter before the Y is a consonant, replace the Y with IES. Fries and babies.

Hopefully, that should make things a little clearer for you.

We do we hate Mondays?

If I were to ask you what your favourite day of the week is, I’m sure very few of you would say “Monday”. But why do we hate Mondays so much?

It’s probably because it’s the first day back to work after the weekend. You have spent the last two days, relaxing, having fun, and doing whatever you want. However, now, it’s time for you to put all of that behind you, and get back to work.

Even though Monday’s work is just as hard as any other workday, it feels worse because you’re not used to it yet. Garfield is likely responsible for popularizing the idea that Mondays are terrible.

Why is a week seven days?

One day is the amount of time it takes for the Earth to rotate once. One Month is how long it takes the moon to orbit the Earth once. And one year is how long it takes for the Earth to orbit the sun.

But where do the days of the week come from?

For that, we have the Babylonians to thank!

They loved looking up at the stars. Much like how we have a base 10 counting system, most of them used a base 60. This is what they used to create minutes and seconds. To the Babylonians, 7 was a mystical number, which is why one week consisted of 7 days.

It wasn’t until the Roman emperor Constantine that having a week of 7 days became a regular part of our lives.

Monday in other languages

Many languages name “Monday” after the moon. However, not every language follows this rule. Some languages have slightly different approaches.

Some cultures have named Monday something along the lines of “First day”. These include Russian, Belarusian, Shina, Sanskirt, and Urdu.

Other languages named it along the lines of “Second day” as to them, Sunday is the first day. These include Portuguese, Icelandic, Greek, Hebrew, and Arabic.

There are even a small number of languages who have called Monday “third day”. The only example of this I could find was Swahili.

One language which breaks all the rules is Meitei who’s word for Monday would translate as “King’s climb”, related to their creation myth.

Idioms with the word “Monday”

Here are some common idioms that use the word “Monday”.

  • Monday’s child- a beautiful child.
  • Monday Morning – a miserable morning.
  • Cyber Monday, Black Monday, Easter Monday.
  • Monday to Friday- the typical work week.


As you can see whether you should be using “Mondays” or “Monday’s” depends on the context in which you wish to use it.

If you’re talking about more than one Monday, just add an S “Mondays”. But if you’re talking about something that belongs to Monday, add an S and an apostrophe, “Monday’s”.

In our, and many other languages, Monday is the day of the moon. But some of the other languages have decided to take a slightly different route. Monday and Sunday are the only days not named after gods.

Now you know about the grammar and history of Monday, perhaps now you can learn not to hate it.

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