This weeks' (week's)

Writers often ask: should it be "week's" or "weeks'"? Use week's for possession by a single week; use weeks' for possession by more than one week.

Quick answer: use week's for one week, weeks' for multiple weeks

If something belongs to one week, write week's. If it belongs to multiple weeks, write weeks'.

This week's schedule = the schedule for one week.
Two weeks' notice = the notice covers two weeks (plural possessive).
Tip: words like this, next, or last usually point to a single week → week's. Numbers or plural spans (two, several) point to weeks'.

Core rule, quick tests and grammar specifics

Rule: add 's to singular nouns (week → week's). For regular plurals that already end in s, add only an apostrophe after the s (weeks → weeks').

Test 1: Ask whether one week or multiple weeks "own" the thing.
Test 2: Substitute "this week" vs "these weeks" or "for one week" vs "for several weeks" to see which reads naturally.
Test 3: If a numeral appears (two, three), you usually need the plural possessive: weeks'.

Spacing, punctuation and common micro-errors

No space before the apostrophe: write week's not week 's. Don't add an extra apostrophe (weeks''). The apostrophe stays inside the word; punctuation such as commas or periods follows the word.

Correct: Next week's meeting starts at 9 a.m.
Incorrect: Next week 's meeting will start at 9 a.m.
Correct plural possessive: We have two weeks' worth of notes.
Avoid double apostrophes: weeks'' or week''s.

Hyphenation and compound time phrases

Hyphens do not change the apostrophe rule. Use hyphens for compound modifiers before nouns: a two-week course, a week-long project. Avoid constructions like week's-long.

Before a noun: a two-week workshop (hyphenate).
After a noun: The workshop is two weeks long (no hyphen).
Prefer: week-long schedule or the week's schedule - not week's-long schedule.

Examples: common wrong/right pairs (general)

Read the wrong sentence, then the corrected version and reason.

Wrong: This weeks' assignment is due on Friday.
Right: This week's assignment is due on Friday.
Wrong: I'm looking forward to next weeks' vacation.
Right: I'm looking forward to next week's vacation.
Wrong: Please submit the report by this weeks' end.
Right: Please submit the report by this week's end.
Wrong: We need two week's worth of samples.
Right: We need two weeks' worth of samples.
Wrong: Our months' planning was interrupted.
Right: Our month's planning was interrupted. (If you mean one month.)
Wrong: The following weeks' sessions are busy.
Right: The following weeks' sessions are busy. (Correct only if you mean sessions across multiple weeks.)

Examples for work writing (emails, reports, scheduling)

At work, apostrophe mistakes can change deadlines or sound sloppy. These quick fixes keep messages clear.

Work - Wrong: This weeks' agenda: budget review and hiring. Work -
Right: This week's agenda: budget review and hiring.
Work - Wrong: We need three week's worth of data for the quarterly analysis. Work -
Right: We need three weeks' worth of data for the quarterly analysis.
Work - Wrong: Please give me next weeks' availability by EOD. Work -
Right: Please give me next week's availability by EOD.

Try your own sentence

Context usually makes the right answer clear. Test the full sentence with the substitution method before changing the apostrophe.

Examples for school and academic writing

Precise timelines avoid confusion for students and instructors.

School - Wrong: This weeks' homework must be uploaded by midnight. School -
Right: This week's homework must be uploaded by midnight.
School - Wrong: Students will have two week's to complete the group project. School -
Right: Students will have two weeks' to complete the group project.
School - Wrong: Refer to next weeks' lecture notes for the exam review. School -
Right: Refer to next week's lecture notes for the exam review.

Examples for casual messages and social writing

People often drop apostrophes informally, but applying the same rule keeps meaning clear.

Casual - Wrong: Who's bringing snacks for next weeks' party? Casual -
Right: Who's bringing snacks for next week's party?
Casual - Wrong: I've been sick for the last two week's and missed practice. Casual -
Right: I've been sick for the last two weeks and missed practice.
Casual - Wrong: This weeks' playlist is fire! Casual -
Right: This week's playlist is fire!

Rewrite help: diagnose and fix your sentence step by step

Use these steps when you see week's or weeks' and want a quick fix.

Step 1: Decide whether one week or multiple weeks own the thing. Look for this/next/last vs numbers.
Step 2: Substitute "this week" vs "these weeks" or "for one week" vs "for several weeks."
Step 3: If the possessive feels awkward, rephrase: "for the next two weeks," "during this week," or use an adjective: "a two-week course."

Rewrite:
Wrong: The following weeks' schedule is messy. → If you mean one upcoming week: The following week's schedule is messy. → If you mean two weeks: For the following two weeks, the schedule is messy.
Rewrite:
Wrong: We need three week's worth of samples. → Better: We need three weeks' worth of samples.
Rewrite:
Wrong: This weeks' agenda should be changed. → Better: Please update this week's agenda.

Memory trick and quick habit

Memory trick: If you can naturally say "this week" before the noun, use week's. If you'd say "these weeks" or you have a number, use weeks'.

"This week" → week's.
"Two weeks" → weeks'.
When in doubt, rephrase: "for the next two weeks" or "during this week" avoids apostrophe fuss.

Similar mistakes and brief grammar reminders

Apply the same singular/plural possessive test to days and months. Watch its vs it's: its is the possessive pronoun; it's is a contraction for it is or it has.

One month → month's; several months → months'.
One day → day's; several days → days'.
its (possessive pronoun) vs it's (contraction): The company changed its policy. It's clear now.

FAQ

Should I write this week's or this weeks'?

Write this week's. "This" points to a single week, so use the singular possessive.

Is next weeks correct without an apostrophe?

No. If you mean the single week after this one, write next week's. Use next weeks' only if the possession covers multiple upcoming weeks.

How do I write two weeks notice?

Correct: two weeks' notice (apostrophe after the s). In casual writing some drop the apostrophe, but the proper form is two weeks' notice.

Can I say "weeks worth" without an apostrophe?

No. Write two weeks' worth (plural possessive). For one week, write week's worth.

What about its vs it's and other apostrophes?

its is a possessive pronoun and never takes an apostrophe; it's is a contraction for it is or it has. Use the same singular/plural test for day/day's and month/month's.

Quick check before you send

When unsure, run the three-step test: identify singular vs plural, try the substitution ("this week" vs "these weeks"), or rephrase the sentence. A quick scan prevents repeated mistakes and sharpens emails, reports, and posts.