How many days are in each month?
Seven months have 31 days, four have 30, and February has 28, or 29 in a leap year. The next leap year is 2028.
On the calendar set by the Calendar (New Style) Act 1750.
| Month | Days | In a leap year |
|---|---|---|
| January | 31 | 31 |
| February | 28 | 29 |
| March | 31 | 31 |
| April | 30 | 30 |
| May | 31 | 31 |
| June | 30 | 30 |
| July | 31 | 31 |
| August | 31 | 31 |
| September | 30 | 30 |
| October | 31 | 31 |
| November | 30 | 30 |
| December | 31 | 31 |
30 or 31?
April, June, September, November have 30 days. January, March, May, July, August, October, December have 31.
An old rhyme helps: "Thirty days hath September, April, June and November. All the rest have thirty-one, except February alone." Or count on your knuckles: each knuckle is a 31-day month and each dip between them is a shorter one, starting with January on the first knuckle.
Is it a leap year?
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Not a leap year | 2026 does not divide by 4 | 365 days |
Where the figures come from
- A leap year comes every this many years: 4 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Hundredth years are common years, not leap years: 100 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Except every fourth hundredth year, which is a leap year: 400 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Days in a common year: 365 days. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.