January 2027 has 31 days. The first day of the month is Friday (2027-01-01) and the last day is Sunday (2027-01-31).
How many days in each month?
| Month | Days (common) | Days (leap year) | Mnemonic |
|---|---|---|---|
| January | 31 | 31 | "Thirty days..." |
| February | 28 | 29 | ...except February alone |
| March | 31 | 31 | "Thirty days..." |
| April | 30 | 30 | April, June, Sept, Nov |
| May | 31 | 31 | "Thirty days..." |
| June | 30 | 30 | April, June, Sept, Nov |
| July | 31 | 31 | "Thirty days..." |
| August | 31 | 31 | "Thirty days..." |
| September | 30 | 30 | April, June, Sept, Nov |
| October | 31 | 31 | "Thirty days..." |
| November | 30 | 30 | April, June, Sept, Nov |
| December | 31 | 31 | "Thirty days..." |
| Total | 365 | 366 | — |
💡 Did you know? The Gregorian calendar's leap year rules correct for the fact that Earth's orbit is 365.2425 days (not exactly 365). Without leap years, our calendar would drift about 1 day every 4 years, or 25 days per century.
Frequently Asked Questions
January 2027 has 31 days. It starts on a Friday and ends on a Sunday.
No, 2026 is not a leap year. 2026 ÷ 4 = 506.5, so it's not divisible by 4. The next leap years are 2028, 2032, and 2036. A century year (e.g. 2100) is only a leap year if divisible by 400 — so 2000 was leap, 2100 will not be.
February 2026 has 28 days (2026 is not a leap year). February 2028 will have 29 days because 2028 is a leap year.
April, June, September, and November each have 30 days. The mnemonic: "30 days hath September, April, June, and November. All the rest have 31, except for February alone (28 or 29 in leap years)."
January, March, May, July, August, October, and December each have 31 days. That's 7 months with 31 days.
Use the knuckle mnemonic: make a fist, count the knuckles and valleys. Knuckle months (31 days): Jan, Feb(skip), Mar, Apr(skip), May, Jun(skip), Jul, Aug, Sep(skip), Oct, Nov(skip), Dec. The 31-day months are on the knuckles.
Leap years are divisible by 4, except centuries (divisible by 100) which must also be divisible by 400. Examples: 2000 leap, 1900 not leap, 2024 leap, 2026 not leap.
In the Roman calendar, February was the last month of the year and had 28 days. When Julius Caesar reformed the calendar in 46 BCE, he added days to other months but kept February at 28. The leap day was added to February in 1582 by Pope Gregory XIII's reform.