Apostrophes are used in time expressions. For example:
- 1 year's insurance
- 2 days' leave
- a week's pay
Apostrophes in Time Expressions (Temporal Expressions)Apostrophes are used in time expressions (e.g., three years' experience, two days' pay, one day's time). These are also known as temporal expressions.
In a temporal expression, the apostrophe is positioned before the s for single units of time and after for multiple units of time. For example:
These are both correct.
This is wrong. It should be 3 months' mobile insurance.
This is wrong. It should be 4 years' free credit.
DO NOT USE APOSTROPHES FOR ALL TIME EXPRESSIONS – ONLY WHEN THEY COULD REPLACE THE WORD OF
The following do not have any apostrophes in them:
(This is nonsense. It's wrong.)
IT'S NOT ALL ABOUT TIME
The vast majority of these expressions are time expressions, but some relate to value and distance too:
The apostrophe error with plurals
Apostrophes replace letters
Apostrophes to show the plural of abbreviations
Apostrophes show possession