7 months have 31 days, 4 have 30 and February has 28, or 29 in a leap year. A common year has 365 days and a leap year 366.
| Month | Days (2027) | Days in a leap year (2028) | Hours |
|---|---|---|---|
| January | 31 | 31 | 744 |
| February | 28 | 29 | 672 |
| March | 31 | 31 | 744 |
| April | 30 | 30 | 720 |
| May | 31 | 31 | 744 |
| June | 30 | 30 | 720 |
| July | 31 | 31 | 744 |
| August | 31 | 31 | 744 |
| September | 30 | 30 | 720 |
| October | 31 | 31 | 744 |
| November | 30 | 30 | 720 |
| December | 31 | 31 | 744 |
How it is computed
Month lengths follow the Gregorian calendar. A year is a leap year when it divides by 4, except century years, which must divide by 400: 2028 and 2000 are leap years, 2100 is not. Hours = days × 24.
FAQ
Is there an easy way to remember the month lengths?+
Count on your knuckles: each knuckle is a 31-day month and each gap between knuckles a shorter month, starting with January on the first knuckle.
When is the next leap year?+
2028. Leap years then fall every four years (2032, 2036…), and 2100 will not be one.