All 12 months have at least 28 days. However, February is the only month with exactly 28 days (except for leap years when February has 29 days).

Contents

### How many days have 28 days in a year?

If you talk about 28 days, every month of the year has atleast 28 days, however February is the only month which contains 28 days atmost in a normal years. Moreover, in a leap year it has 29 days.

## What months have 28 or 29 days?

The table below shows the months of the year used in English-speaking countries and many other parts of the world. The list shows the order of the months, starting from January (month 1). The abbreviations or short forms shown are the most common, but other abbreviations are possible, for example: Ja./Fe./Ma.

or J./F./M. The days column shows the number of days in the month. All months have 30 or 31 days, except for February which has 28 days (29 in a leap year). Every fourth year, the month of February has 29 days instead of 28. This year is called a “leap year” and the 29th day of February is a “leap day”.

A leap year has 366 days instead of the usual 365. Most years that can be cleanly divided by four are leap years.2016, 2020 and 2024, for example, are leap years.

month | short form | days | season | |
---|---|---|---|---|

1 | January | Jan. | 31 | winter |

2 | February | Feb. | 28/29 | |

3 | March | Mar. | 31 | spring |

4 | April | Apr. | 30 | |

5 | May | May | 31 | |

6 | June | Jun. | 30 | summer |

7 | July | Jul. | 31 | |

8 | August | Aug. | 31 | |

9 | September | Sep. | 30 | autumn |

10 | October | Oct. | 31 | |

11 | November | Nov. | 30 | |

12 | December | Dec. | 31 | winter |

The seasons are approximate and depend on latitude. Some parts of the world have only three seasons. The seasons shown here are for the North Temperate Zone (for example North America). In the southern hemisphere, the seasons are reversed. EnglishClub : Learn English : Vocabulary : Topic : Time : Months of the Year

### Which month has 28 days?

Why Are There Only 28 Days in February? © Tanusha/Fotolia Each month in the modern consists of at least 28 days. That number would be a nicely rounded 30 were it not for, While every month besides the second in the calendar contains at least 30 days, February falls short with 28 (and 29 on a leap year).

- So why is the most widely used calendar in the world so inconsistent in the lengths of its months? And why is February stuck with the fewest number of days? Blame it on Roman superstition.
- The Gregorian calendar’s oldest ancestor, the first Roman calendar, had a glaring difference in structure from its later variants: it consisted of 10 months rather than 12.

In order to fully sync the calendar with the lunar year, the Roman king added January and February to the original 10 months. The previous calendar had had 6 months of 30 days and 4 months of 31, for a total of 304 days. However, Numa wanted to avoid having even numbers in his calendar, as Roman superstition at the time held that even numbers were unlucky.

He subtracted a day from each of the 30-day months to make them 29. The lunar year consists of 355 days (354.367 to be exact, but calling it 354 would have made the whole year unlucky!), which meant that he now had 56 days left to work with. In the end, at least 1 month out of the 12 needed to contain an even number of days.

This is because of simple mathematical fact: the sum of any even amount (12 months) of odd numbers will always equal an even number—and he wanted the total to be odd. So Numa chose February, a month that would be host to Roman rituals honoring the dead, as the unlucky month to consist of 28 days.

### How many months have 28 days and 31 days?

How Many Have 28, 29, 30, or 31 Days? – The Gregorian calendar has 4 months that are 30 days long and 7 months that are 31 days long. February is the only month that is 28 days long in common years and 29 days long in leap years.

#### Why do some months have 31 30 29 or 28 days?

Professor Helen Parish answers the question of why February has the least number of days as part of the Curious Kids series by The Conversation that gives children the chance to have their questions about the world answered by experts. Why does February has the least number of days? Why does it not have 30 or 31 days like the rest of the eleven months? – Simi, aged 15, Mauritius The reason February is shorter than other months comes down to the history of how we measure and divide the year.

- We know that the Earth takes 365 days and just under six hours to go around the Sun,
- The division of those days into twelve months is a human invention to measure time.
- But it hasn’t always been divided that way.
- In the first surviving ancient Roman calendar, there were ten months.
- The calendar was shaped by the agricultural year, so began in spring with March and ended 304 days later in December.

There was no work to be done in the fields during the two months of winter, and the rest of days in the year were simply not counted in the calendar. In 731BC Numa Pompilius, the second king of Rome, decided to line the calendar up with the phases of the moon.

- There are 12 cycles of the moon each year, so the calendar was divided into twelve months.
- January and February were added and the new calendar year lasted 355 days.
- The Romans believed that even numbers were unlucky, so the length of the months in Pompilius’ calendar alternated between 29 or 31 days.

However, the length of the calendar year meant that the final month – February – was left with only 28. In Rome, February was linked with rituals of purification, or februum – giving it its name. During the festival of Lupercalia purification ceremonies took place to prepare buildings and people for the feasts and sacrifices of the festival.

- During the festival of Feralia food and gifts were brought to cemeteries, to honour the dead and keep them happy so they would not rise and haunt the living.
- However, a calendar year lasting 355 days created its own problems.
- Because the Earth takes longer than this to go round the Sun, as years went by the months and the seasons started to fall out of alignment.

So an extra month called Mercedonius was added to the calendar before the start of March. Mercedonius was not used every year. It was added whenever it was necessary to re-align the months and the seasons. It had either 27 or 28 days, creating a year that lasted for either 377 or 378 days.

### Which months has 29 days?

Gregorian calendar – An image showing which century years are leap years in the Gregorian calendar In the Gregorian calendar, the standard calendar in most of the world, almost every fourth year is a leap year. Each leap year, the month of February has 29 days instead of 28.

- Adding one extra day in the calendar every four years compensates for the fact that a period of 365 days is shorter than a tropical year by almost 6 hours.
- However, this correction is excessive and the Gregorian reform modified the Julian calendar’s scheme of leap years as follows: Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400.

For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. Whereas the Julian calendar year incorrectly summarized Earth’s tropical year as 365.25 days, the Gregorian calendar makes these exceptions to follow a calendar year of 365.2425 days.

- This more closely resembles a mean tropical year of 365.2422 days.
- Over a period of four centuries, the accumulated error of adding a leap day every four years amounts to about three extra days.
- The Gregorian calendar therefore omits three leap days every 400 years, which is the length of its leap cycle,

This is done by omitting February 29 in the three century years (multiples of 100) that are not multiples of 400. The years 2000 and 2400 are leap years, but not 1700, 1800, 1900, 2100, 2200 and 2300. By this rule, an entire leap cycle is 400 years which total 146,097 days, and the average number of days per year is 365 + 1 ⁄ 4 − 1 ⁄ 100 + 1 ⁄ 400 = 365 + 97 ⁄ 400 = 365.2425. This graph shows the variations in date and time of the June Solstice due to unequally spaced “leap day” rules. The Gregorian calendar was designed to keep the vernal equinox on or close to March 21, so that the date of Easter (celebrated on the Sunday after the ecclesiastical full moon that falls on or after March 21) remains close to the vernal equinox.

### Why are months 28 days?

Why does February have 28 days?

- Why is February such a short month, with just 28 days?
- If you want a super-quick answer to this, then – perhaps surprisingly – the fact that February has 28 days is based on nothing more scientific than Roman superstition.
- But you’d probably like a little more explanation than that, so let’s dive in

The Roman calendar divided the year based on lunar cycles. Credit: iStock

- Now that pretty much the entire world uses the Gregorian calendar, we tend to think of its division of the year into months as being somehow carved in stone, but that is far from the case.
- Before there was the Gregorian calendar, there was the Julian calendar – still used in Turkey until as recently as 1927 – and before that there was the Roman calendar.
- The latter originally divided the year from March to December into 10 months of either 29 or 31 days, based on, with the early part of the year simply left unnamed.
- No crops could be planted or harvested during this time, so it wasn’t considered important.
- Later, the Roman king Numa Pompilius added two ‘new’ months, January and February, to ensure that the calendar covered the full year.

Numa Pompilius Giving the Laws to the Romans, n.d. Possibly by Giovanni Battista Galestruzzi. Photo by Heritage Art/Heritage Images via Getty Images The reason there were always 29 or 31 days, never 30, was simply that the Romans considered even numbers unlucky.

- Unfortunately, 12 times (any odd number) is always an even number.
- To make the number of days on the calendar add up to 365 in a year, there would have to be one month with an even number.
- February was chosen to have 28 days as this was when the Romans honoured their dead.
- Presumably they figured you don’t get much unluckier than being dead, so what harm could it do? Later, Julius Caesar rearranged the calendar to reflect the ‘movements’ of the Sun rather than the lunar cycle, while his Julian calendar would itself be fine-tuned on the orders of Pope Gregory XIII in 1583 to give us the Gregorian calendar we know today.

But somehow, little old February with its unique 28-day length survived all these changes. Except in Leap Years, of course, when it becomes the lucky recipient of a whole extra day. When exactly those Leap Years happen, of course, is one of the key differences between the various calendars mentioned above – but that’s a story for another day : Why does February have 28 days?

#### Do all months have 30 or 31 days?

Answer and Explanation: Only four of our 12 months have exactly 30 days : April, June, September, and November. There are seven months with 31 days: January, March, May, July, August, October, and December. February is the oddball, with only 28 days, except in leap years when it has 29.

### Which months have 30 days?

Answer 1) There are 12 months in a year namely January, February, March, April, May, June, July, August, September, October, November, and December. Answer 2) There are 4 months in a year having 30 days namely April, June, September, and November. Answer 3) There are 7 months in a year having 31 days namely January, March, May, July, August, October, and December.

## Why does February have 29 days?

Nearly every four years, we add an extra day to the calendar in the form of February 29, also known as Leap Day. Put simply, these additional 24 hours are built into the calendar to ensure that it stays in line with the Earth’s movement around the Sun.

## Why does February have 28 days for kids?

Why does February has the least number of days? Why does it not have 30 or 31 days like the rest of the eleven months? – Simi, aged 15, Mauritius The reason February is shorter than other months comes down to the history of how we measure and divide the year.

We know that the Earth takes 365 days and just under six hours to go around the Sun, The division of those days into twelve months is a human invention to measure time. But it hasn’t always been divided that way. In the first surviving ancient Roman calendar, there were ten months. The calendar was shaped by the agricultural year, so began in spring with March and ended 304 days later in December.

There was no work to be done in the fields during the two months of winter, and the rest of days in the year were simply not counted in the calendar. Curious Kids is a series by The Conversation that gives children the chance to have their questions about the world answered by experts. If you have a question you’d like an expert to answer, send it to [email protected] and make sure you include the asker’s first name, age and town or city.

We won’t be able to answer every question, but we’ll do our very best. In 731BC Numa Pompilius, the second king of Rome, decided to line the calendar up with the phases of the moon. There are 12 cycles of the moon each year, so the calendar was divided into twelve months. January and February were added and the new calendar year lasted 355 days.

The Romans believed that even numbers were unlucky, so the length of the months in Pompilius’ calendar alternated between 29 or 31 days. However, the length of the calendar year meant that the final month – February – was left with only 28. In Rome, February was linked with rituals of purification, or februum – giving it its name.

- During the festival of Lupercalia purification ceremonies took place to prepare buildings and people for the feasts and sacrifices of the festival.
- During the festival of Feralia food and gifts were brought to cemeteries, to honour the dead and keep them happy so they would not rise and haunt the living.

However, a calendar year lasting 355 days created its own problems. Because the Earth takes longer than this to go round the Sun, as years went by the months and the seasons started to fall out of alignment. So an extra month called Mercedonius was added to the calendar before the start of March.

- Mercedonius was not used every year.
- It was added whenever it was necessary to re-align the months and the seasons.
- It had either 27 or 28 days, creating a year that lasted for either 377 or 378 days.
- But this had unfortunate consequences for February.
- Mercedonius started on 24th February, cutting four days from a month that was already the shortest in the calendar.

And although Mercedonius helped to link the months with the seasons, its use was unpredictable. People living far from Rome might not realise that the extra month had been added to the calendar.

### Why is February called February?

February is named after an ancient Roman festival of purification called Februa. John Samuel Agar (1773–1858), Februa in a shell, pulled by Pisces, represented by two fish. After Edward Francis Burney, from a series of the months.

## Why are there 28 31 days in a month?

Have You Ever Wondered. –

Why don’t all months have the same number of days? Where does the concept of the month come from? Which ancient civilization’s calendar is our current calendar based upon?

Today’s Wonder of the Day was inspired by Quinn. Quinn Wonders, ” Why is there certain amount of days in a month ” Thanks for WONDERing with us, Quinn! Do you know anyone who has a birthday on February 30? How about September 31? Maybe October 32 or November 31? No? Well, there’s a good reason for that and you’ve probably already guessed it: those aren’t even real days! If you check your calendar, you’ll notice that February only has 28 days (unless it’s a leap year ), September only has 30 days, October only has 31 days, and November only has 30 days.

What’s the deal with that? Have you ever WONDERed why all the months of the year don’t have the same number of days? To solve this mystery, we must dig deep into the history of our modern calendar, which is known as the Gregorian calendar, The Gregorian calendar was a modification of the Julian calendar, which itself was a modification of the ancient Roman calendar,

The ancient Romans, like ancient civilizations before them, based their concept of the month on the Moon, Unfortunately, the lunar cycle is approximately 29.5 days, which does not divide evenly into the 365.25 days that make up a year, As a result, the earliest ancient Roman calendars had months that were either 29 or 30 days.

To make things even more confusing, the ancient Romans borrowed from the ancient Greeks to develop the idea of a 10- month calendar that left approximately 60 days unaccounted for. For example, the ancient Romans started using a 10- month calendar in 738 B.C. that included the following months: Martius, Aprilis, Maius, Junius, Quintilis, Sextilis, September, October, November, and December.

The names Quintilis through December derived from the Latin words for five through ten. To account for the remaining 60 or so days, Januarius was added to the beginning of the year and Februarius to the end of the year during Numa’s reign around 700 B.C.

- The calendar stayed in that order until 452 B.C.
- When a small council of Romans, called the Decemvirs, moved February to follow January.
- Julius Caesar modified the Roman calendar in 46 B.C.
- To make each month have either 30 or 31 days, with the exception of Februarius, which had 29 days and gained an extra day every fourth year,

Quintilis was later renamed Julius in his honor. Likewise, Sextilis later became Augustus to honor Augustus Caesar. Augustus was also given an extra day (taken away from Februarius), so that Augustus and Julius would have an equal number of days. So the next time you’re curious about why a particular month has the number of days that it does, you can thank the Moon and the ancient Romans!

## Why do we have 12 months?

Why are there 12 months in the year? – Julius Caesar’s astronomers explained the need for 12 months in a year and the addition of a leap year to synchronize with the seasons. At the time, there were only ten months in the calendar, while there are just over 12 lunar cycles in a year,

### How old is 28 in days?

At 28 years old, you’ll be 10220 days old!

## Who decided February has 28 days?

Our modern calendar is loosely based on the ancient Romans’ calendars. In the 8th century BCE, the Romans used the Calendar of Romulus, a 10-month calendar that kicked the year off in March (with the spring equinox) and ended in December. January and February didn’t even exist.

- The second king of Rome, Numa Pompilius, decided to make the calendar more accurate by syncing it up with the actual lunar year —which is about 354 days long.
- Numa tacked on two months—January and February—after December to account for the new days.
- In around 45 B.C., Julius Caesar commissioned an expert to put aside the lunar origins of the Roman calendar and make it sun-based, like the Egyptian one,

Caesar added 10 days to the calendar year and an extra day in February every four years. The Gregorian calendar, our modern calendar, was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar, Watch these recommended TED-Ed Lessons: The Leap Year explained Every four years, we gain an extra calendar day.

But why? Neil deGrasse Tyson explains the science behind the leap year. What causes the phases of the moon? What causes the phases of the moon? The common incorrect answer is the shadow of the Earth. The phases of the moon are actually just a result of our perception of the moon’s half-illuminated surface.

When the moon does pass through Earth’s shadow the result is a lunar eclipse. This can be spectacular as the moon turns a deep shade of red. A glimpse of teenage life in ancient Rome Welcome to the world of Lucius Popidius Secundus, a 17-year old living in Rome in 73 AD.

- His life is a typical one of arranged marriages, coming-of-age festivals, and communal baths.
- Take a look at this exquisitely detailed lesson on life of a typical Roman teenager two thousand years ago.
- The great conspiracy against Julius Caesar On March 15th, 44 BCE, Roman dictator Julius Caesar was assassinated by a group of about 60 of his own senators.

Why did these self-titled Liberators want him dead? And why did Brutus, whose own life had been saved by Caesar, join in the plot? Kathryn Tempest investigates the personal and political assassination of Julius Caesar.

### Why don t we have 13 months of 28 days?

Why don’t months have 28 days to match up more closely to the lunar cycle? 13 months would make for 364 days. Actually the lunar cycle is about 29.5 days. Some calendars – including the Muslim calendar and the Jewish calendar – do indeed have months that match the lunar cycles.

## What country has 13 months in a year?

13-month calendar – The Ethiopian calendar has 13 months in a year, 12 of which have 30 days. The last month, called Pagume, has five days, and six days in a leap year. In contrast, the Gregorian calendar has days that can be less or more than 30 days in a month.

This means they are between seven and eight years behind the rest of us, with 2014 getting under way last September. AFP This is another difference you see – Ethiopians celebrate the beginning of a new year on 11 September, or 12 September if it is a leap year, the BBC has explained. So, the people of – officially at least – only celebrated the turn of the millennium on 11 September 2007.It also means that the country has many public holidays on different dates compared to other countries across the world because of this different calendar.

Modern-day Ethiopia still embraces its ancient calendar. However, travellers hardly experience any inconveniences because of the calendar difference. Most Ethiopians are aware of the Gregorian calendar and some even use both calendars interchangeably. It sounds confusing, but Ethiopians won’t care one bit.

#### Why February has 28 and 29 days?

It is said Romans believed that even numbers are unlucky. And that’s why each month had either 29 or 31 days. But to reach 355 days, one month had to be even. And thus, February was selected to be the month with 28 days.

### How do you know if February has 28 or 29 days?

Download Article Download Article Leap years are a way to ensure that our calendar is on track. There are roughly 365.24 days in a year, which means that we need to add 1 extra day once every 4 years, and a year with 1 extra day is known as a leap year. We need to do this to ensure that we don’t fall several hours behind each year.

- 1 Identify the year you want to check. Calculating leap years requires having a year that you want to check. Use a past year, the current year, or a future year as your starting point.
- For example, you could start by checking 1997 or 2012 if you want to look at a past year, or go with 2019 to check the current year, or select 2025 or 2028 to check a future year.

- 2 See if the number is evenly divisible by 4. Dividing the year by 4 will result in a whole number with no remainder if the number is evenly divisible. The number must be evenly divisible by 4! Otherwise, it is not a leap year.
- For example, dividing 1997 by 4 gives you 499.25, which is not a whole number because it ends with a decimal. Therefore, it is not a leap year.
- When you divide 2012 by 4, you get 503, which is a whole number. This means that 2012 is likely a leap year.

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- 3 Confirm the number isn’t evenly divisible by 100. If a year is evenly divisible by 4, but it is not evenly divisible 100, then it is a leap year. If a year is divisible by both 4 and 100, then it might not be a leap year, and you will have to perform 1 more calculation to check.
- For example, 2012 is evenly divisible by 4, but not 100 since it results in a decimal answer (20.12). This means that 2012 is definitely a leap year.
- 2000 is divisible by 4 and it is also evenly divisible by 100 since it leaves a result of 20. That means that 2000 might not be a leap year and you will have to divide it 1 more time.

- 4 Check if the number is evenly divisible by 400 to confirm a leap year. If a year is divisible by 100, but not 400, then it is not a leap year. If a year is divisible by both 100 and 400, then it is a leap year.
- For example, 1900 is evenly divisible by 100, but not 400 since it gives you a result of 4.75. This means that 1900 is not a leap year.
- On the other hand, 2000 is evenly divisible by 100 and 400, since it gives you a result of 5. That means that the year 2000 is a leap year.

Tip : If you don’t want to manually divide a number to check it, or if you are unsure of your results, use an online leap year calculator. This will do the calculations for you.

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- 1 Locate the year you want to know about in a calendar. Start by identifying the year that you want to check and then get out a physical calendar or open an online calendar to check that year. If you are using an online calendar, then you should be able to look back or ahead by at least a few years.
- For example, if you want to see if 2016 was a leap year, go back to that year’s calendar.
- If you want to check if 2021 is a leap year, go to that year online.

- 2 Turn to February and see if there is a 29th day. Leap years always result in 1 extra day that is placed at the end of February, since this is the shortest month in the year. Turn to that month in the calendar and check to see if there is a February 29th listed. If there is, then it is a leap year.
- If February only goes through the 28th, then it is not a leap year.

- 3 Expect another leap year in 4 years. Each year lasts about 365 days and slightly under 6 hours. That extra 6 hours adds up to an extra day over the course of 4 years, which is why leap years occur almost every 4 years. Count ahead 4 years from the last leap year to estimate when the next leap year will be.
- For example, since 2016 was a leap year, you could count ahead 4 years to 2020 as a way to predict the next leap year.

Tip : Keep in mind that sometimes there won’t be a leap year for 8 years since there is a little less than 6 extra hours each year—5 hours, 48 minutes, and 46 seconds to be exact. That is why it is helpful to do calculations instead of relying on a leap year every 4 years.

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### Is 4 weeks a month?

Number of Weeks in a Month All the months in the calendar have 4 complete weeks because every month has at least 28 days.

#### How many 30 days in a year?

So, there are 12 months in a year. – 2. The months having 30 days in a year are April, June, September, and November.

## How many in a year have 30 days?

Answer 1) There are 12 months in a year namely January, February, March, April, May, June, July, August, September, October, November, and December. Answer 2) There are 4 months in a year having 30 days namely April, June, September, and November. Answer 3) There are 7 months in a year having 31 days namely January, March, May, July, August, October, and December.

#### How many years have 366 days?

The Short Answer: It takes approximately 365.25 days for Earth to orbit the Sun — a solar year. We usually round the days in a calendar year to 365. To make up for the missing partial day, we add one day to our calendar approximately every four years. That is a leap year. In an ordinary year, if you were to count all the days in a calendar from January to December, you’d count 365 days. But approximately every four years, February has 29 days instead of 28. So, there are 366 days in the year. This is called a leap year. Credit: NASA/JPL-Caltech

### How many 31 days in a year?

Total number of months with 31 days are 7. Hence, there are 7 months in a year with 31 days.