Calendar Tool
Select the year with arrows and click on a month to see the number of days and calendar view. Today's date is highlighted in green.
📅 Regular year — 365 days
March 2026
Number of Days in Months
| Month | Days | Note |
|---|---|---|
| January | 31 | First month of the year |
| February | 28 / 29 | 29 days in leap year |
| March | 31 | Vernal equinox (~20.3.) |
| April | 30 | |
| May | 31 | May Day 1.5. |
| June | 30 | Midsummer, summer solstice |
| July | 31 | Warmest month of the year |
| August | 31 | End of summer vacations |
| September | 30 | Autumnal equinox (~22.9.) |
| October | 31 | |
| November | 30 | All Saints' Day |
| December | 31 | Christmas, winter solstice |
How many days are in January?
January has 31 days. January is the first month of the year and often the coldest. New Year's Day and Epiphany (6.1.) are common holidays.
How many days are in February?
February has 28 days or 29 days in a leap year. February is the shortest month of the year. Valentine's Day is celebrated on February 14.
How many days are in March?
March has 31 days. The vernal equinox falls around March 20, when night and day are equal length.
How many days are in April?
April has 30 days. Easter often falls in April. Nature awakens and temperatures rise.
How many days are in May?
May has 31 days. May Day (1.5.) and Mother's Day are the most significant holidays in May.
How many days are in June?
June has 30 days. Midsummer and summer solstice (~21.6.) bring the longest day of the year.
How many days are in July?
July has 31 days. July is typically the warmest month in the Northern Hemisphere and a popular vacation month.
How many days are in August?
August has 31 days. August marks the return to work and the start of schools for many.
How many days are in September?
September has 30 days. The autumnal equinox falls around September 22. Foliage begins in the Northern Hemisphere.
How many days are in October?
October has 31 days. Daylight saving time ends on the last Sunday of October.
How many days are in November?
November has 30 days. All Saints' Day and Father's Day are holidays in November.
How many days are in December?
December has 31 days. Independence Day (6.12.), Christmas, and New Year's Eve end the year.
Leap Year Rules
A leap year occurs every fourth year, but there are exceptions to the rule:
- If the year is divisible by 4 → leap year
- If the year is divisible by 100 → not a leap year
- If the year is divisible by 400 → leap year anyway
For example, the year 2000 was a leap year (divisible by 400), but 1900 was not. The next exception is the year 2100.
Mnemonic: Knuckle Method
An easy way to remember the lengths of months is to use the knuckles on the back of your hand:
- 🤜 Knuckle = 31 days: Jan, Mar, May, Jul, Aug, Oct, Dec
- 👇 Valley = 30 days (or 28/29): Feb, Apr, Jun, Sep, Nov
Note that July and August are both 31 days — this is because August was named after Emperor Augustus, and it could not be shorter than July (Julius Caesar).
Gregorian Calendar
Our current calendar was introduced in 1582 by Pope Gregory XIII. It replaced the Julian calendar, whose simpler leap year rule led to a shift in time over centuries. The Gregorian calendar was adopted in many countries in the 18th century.
Try also the summer vacation calculator or Christmas calculator for date calculations!
Sources
- Timeanddate.com: Leap Year Rules