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History of the Gregorian Calendar
The Gregorian calendar is the most prevalently used calendar today. Within this calendar, a standard year consists of 365 days with a leap day being introduced to the month of February during a leap year. The months of April, June, September, and November have 30 days, while the rest have 31 days except for February, which has 28 days in a standard year, and 29 in a leap year.
The Gregorian calendar is a reformed version of the Julian calendar, which was itself a modification of the ancient Roman calendar. The ancient Roman calendar was believed to be an observational lunar calendar, based on the cycles of the moon's phases. The Romans were then believed to have adopted a 10-month calendar with 304 days, leaving the remaining 50 or so days as an unorganized winter. This calendar allowed the summer and winter months to become completely misplaced, leading to the adoption of more accurate calendars.
The Republican calendar later used by Rome followed Greek calendars in its assumptions of 29.5 days in a lunar cycle, and 12.5 synodic months in a solar year, which align every fourth year upon the addition of the intercalary months of January and February. From this point, many attempts were made to align the Republican calendar with the solar year including the addition of an extra month to certain years to supplant the lack of days in a particular year.
In 46 BC, the calendar was further reformed by Julius Caesar, introducing an algorithm that removed the dependence of calendars from the observation of the new moon. In order to accomplish this, Caesar inserted an additional 10 days into the Republican calendar, making the total number of days in a year 365. He also added the intercalation of a leap day every fourth year, all in an attempt to further synchronize the Roman calendar with the solar year.
Despite all efforts, the Julian calendar still required further reform, since the calendar drifted with respect to the equinoxes and solstices by approximately 11 minutes per year. By 1582, this resulted in a difference of 10 days from what was expected. Pope Gregory XIII addressed this by essentially skipping 10 days in the date, making the day after October 4, 1582, October 15. An adjustment was also made to the algorithm of the Julian calendar that changed which century years would be considered leap years. Under the Gregorian calendar, century years not divisible by 400 would not be leap years.
These changes reduced the error from 1 day in 128 years, to 1 day in 3,030 years with respect to the current value of the mean solar year.
The adoption of the Gregorian calendar occurred slowly over a period of centuries, and despite many proposals to further reform the calendar, the Gregorian Calendar still prevails as the most commonly used dating system worldwide.
Holidays
A holiday is a day that, either by custom or by law, is set aside such that regular activities like going to work or school is suspended, or at least reduced. The term "holiday" can be interpreted differently, depending on the region. In the U.S., paid leave is typically referred to as "vacation," while national, religious, or cultural days off are referred to exclusively as "holiday." In some regions, however, such as the United Kingdom or former British colonies, the term holiday can also refer to paid leave.
Generally, holidays are meant to commemorate some event, person, or group of cultural or religious significance.
Although certain holidays, such as Christmas and New Year's Day, are widely celebrated worldwide, most countries have their own set of holidays that are specific to the country, and even the same holidays may be observed differently within countries: some may receive a full suspension of typical daily activities, while others may only get partial days off. Certain countries have holidays that essentially shut down almost all businesses. As an example, in Brazil, Carnaval do Brasil results in almost a full week in which only industrial production, retail establishments, or carnival-related businesses, function.
This calculator is mainly geared towards U.S. holidays, but holidays specific to a given country can be entered manually. Certain holidays can also be excluded. For a further level of specificity, federal holidays in the U.S. refer to holidays that have been recognized by the U.S. government; on these days, non-essential federal government offices are closed, and all federal employees receive paid leave.
This is not necessarily true in the private sector, however, and which federal holidays a private sector employee receives is largely dependent on the discretion of the company. In some cases, an employee who is required to work on a federal holiday may receive compensation in the form of holiday pay in addition to their regular wages.
Certain holidays such as New Year's Day are referred to as "fixed holidays," since they fall on the same date every year. Others, such as the birthday of Martin Luther King, Jr., don't have a fixed date, because they occur on a "floating Monday"; in this particular case, the holiday occurs on the third Monday of January. Another widely observed holiday in the U.S., Thanksgiving, occurs on a "floating Thursday," the fourth Thursday In November, hence the dates of these holidays vary by year. Below are two tables showing the dates of federal holidays in the U.S. for 2022 and 2023.
2022 U.S. Federal Holidays
2023 U.S. Federal Holidays
Age Calculator
Basic Calculator
Age Calculator
Month
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Day
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Year
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Date of Birth:
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Age on this date:
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Answer:
Age = 21 years
Born on: Tuesday December 5, 2000
Age on: Wednesday November 30, 2022
= 21 years 11 months 25 days
= 263 months 25 days
= 8,030 days
≈ 192,720 hours
≈ 11,563,200 minutes
≈ 693,792,000 seconds
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Calculator Use
Calculate the age of a person, place or thing. The age calculator calculates age given a date of birth in years, months and days. You can also use this calculator to find length of time between two dates.
The age calculator finds the age time span in years months and days, months and days, and in total days only.
How to Calculate Age
This age calculator uses 2 similar but slightly different methods to calculate age. One method is used to give age in years, months and days, and also months and days. The other method is used to very precisely calculate age in total days only.
When calculating age to the detailed level of days it's important to remember that not all months have the same number of days. Also, while a year has 365 days, a leap year has 366 days.
When you calculate age in terms that include years, this calculator provides the answer in common terms. For example, a teenager might say he is 15 years old rather than saying he's 12 normal years old plus 3 leap years old. This age calculator uses the same assumption -- although we know years may have different lengths, we generalize between regular years and leap years, and call them equal.
The same is true for months. If a baby is 7 months old, the parents would not say she is 4 months that are 31 days long, plus 2 months that are 30 days long, plus 1 month that is 28 days long. We typically generalize across months of different lengths, and count them all equal as general months.
The age calculator finds age in terms that are commonly used, calling all years equal and all months equal. When calculating days however, the calculator uses a function to find the precise number of days between dates.
If you wanted to know how many days you've been alive you need to account for extra days in leap years.
You also need to know the total number of months with 31 days, total months with 30 days, and total months with 28 days.
The age calculator uses a function that recognizes how many leap years are in a given time span. It also calculates the specific number of days in a partial year. For example, if you were born on March 5 and today is June 7, the calculator finds the exact number of days that occur between those dates.
Your age in total number of days is calculated as:
- Number of years, x, with 365 days = 365x plus
- Number of years, y, with 366 days = 366y plus
- Number of days in the remaining partial year
This calculator assumes the start date is day 0 and begins counting one full day after day 0. For example if you input the dates 03/15/2022 and 3/18/2022 into the calculator you will get a total age of 3 days. Day 1 is the 16th, day 2 is the 17th, and day 3 is the 18th. The 15th is not counted in the tally of days.
Date Formats
The age calculator allows you to input single digit months and days. You do not have to pad them with a leading zero. You must input the 4-digit year however.
US date formatting can use a forward slash, a period, or a dash:
- mm/dd/yyyy
- mm.dd.yyyy
- mm-dd-yyyy
European date formatting can use a forward slash, a period, or a dash:
- dd/mm/yyyy
- dd.mm.yyyy
- dd-mm-yyyy
International date formatting according to ISO 8601 use only a dash (-):
- yyyy-mm-dd
Today's date is based on Greenwich Mean Time (GMT).
Related Calculators: Date Difference, Date ± Days or Business Days Calculator.
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Speaking of preschool admissions, you will not be able to accept a child if you do not know his or her exact age.
Most preschools recommend that children between 2.5 and 3 years of age enter preschool. If you cannot calculate your child's age, you may end up passing the entry age limit and then your child will need to pass some tests to be admitted to a higher class. Likewise, when applying to a college or university, there is again an age limit, and if you are above or below this age limit, you are not eligible for admission. Knowing the exact age is very important, we know that the new generation knows their age, but most parents who do not remember well always forget the age of their children.
For people with poor memory we have developed a calculator called Exact Age Calculator. You can calculate your age any time you are confused about your exact age. This tool is handy because many people get confused the moment someone asks them what is your age? Now you do not need to calculate your age on your fingers and do not even need to ask how old I am, we provide you with a free birth age calculator.
You can use it anytime anywhere as long as you have internet access. Many older people know their year of birth, but they cannot calculate their age because they do not know a simple calculation. They need a tool that can quickly tell them how old they are currently. Determining the right age is important because your entire life is based on that documented age.
You will receive a national identity card when you turn 18. If you want to get a national identity card at 17, you are not eligible for one. Therefore, you must know how old you are in order to use all services at that age. Before you acquire nationality, you are prohibited from driving a car or a bicycle, because before the age of 18 they know that a person is not mature enough to perform these tasks effectively. In the modern world, there is a tendency to celebrate birthdays, so many people know how old they are. Calculators are not required, but this is for purpose when you get confused. It can also be used to calculate the age of other people.
Like those older people, your grandparents who do not know their exact age, but for travel or passport age is a requirement. You have to fill out a questionnaire and you have difficulty calculating the age. Just go to calculator-online.net and open the page of our online age calculator. Enter a year, month, and date of birth that they remember well and click the "Calculate" button to find out how old I was on that date. This will give you their age in no time and you can fill out their forms.
How old am I?
With our simplicity age calculator you solve the question of how old I am in minutes, hours, days, months and years. No doubt everyone is wondering how old I am. Well, in general, our birthday calculator is an amazing widget that helps you calculate your age and find out how many days have passed since your birth. If you want to calculate the age gap between you and your older brother, then you should use our easy age gap calculator!
Using the Age Calculator
Similarly, when you are looking for admission to an institute, university or college, you must fill out an application form.
It also requires your age and you forget your exact age at the time of filling. Instead of asking yourself how old I am or calculating by year of birth which will take you time, you can use our free websites to find out how old you are in seconds. You can quickly fill out the form now. online age calculator can help you feel embarrassed when someone asks you your age and you are like oh i forgot my age let me calculate Don't panic age calculator is here to help you know your exact age just by entering the date, month and year of birth. Many mothers often ask how old my child is, so our birthday calculator helps them calculate their child's age. The aforementioned date of birth calculator tells you your age and even shows how many minutes, hours, days, months and years you have lived!
Age is also crucial in medicine, as many diseases are common at a certain age, and many in childhood. Many people forget their age when they sit in front of the doctor and tell them that they are not at that age.
But the doctor knows well who does not say how old he is. Many diseases that often occur after age 40, including many cardiovascular diseases, such as heart attack, which rarely occurs at a young age under 30, are also very important from a medical point of view in calculating and determining the exact age of a doctor. Many medicines must be used at a certain age due to their effects and side effects. The importance of accurate age cannot be underestimated.
You must be of the age set by the company to get a job. Your age is listed on all your public records that you cannot write or enter the wrong age to get a job. If you tell them the wrong age, you may not get the job, or you may also have to pay a fine for lying about your age. Calculate your age with a simple tool, if you can't count on fingers, it will show you your exact age from your date of birth. This tool will be useful for many people when filling out forms when talking to someone when others ask about age. You can use this handy online actual age calculator tool whenever you want.
Using the age calculator
What is my age in years calculator is a common but useful calculator, because age is the period from birth to the present, means the length of time a person has lived. The correct age is important in almost all areas of life, from kindergarten to the office. Whatever happens between a person's life, age is a fundamental requirement to achieve anything. Age plays a vital role in every goal of your life as age limits are set in every department. Starting from birth, attending preschools, schools, colleges, universities, certain age limits for entry or admission are set for each level. Age limits are set because at a certain age people can practice this mind and body and study a course appropriate for that age. For example, preschoolers are 2.5 years or older below this age, the child cannot study or go to school. He/she has other activities below that 2.5 years.
Online Calculator Words:
Of course, the different questions about age mean how old I am, how old I am and much more! But it's really interesting to uncover the question of how old I am today.
Thus, our experts have provided a date of birth calculator that works as an age generator. It is also called birth date calculator. What's more, once you use the above birth calculator, you'll know about all its features.]
Other Languages: Age Calculator, حاسبة العمر, Calculateur D'âge, Calculadora De Idade, Calculadora De Edad, Yaş Hesaplama, 年齢計算, Ikälaskuri, Kalkulator Umur, Calcolo Età, Altersrechner, Leeftijd Berekenen, 나이 계산기, คํานวณอายุ
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Content
- Calculator of age by date of birth
- Classification of the age of the Academy of Pedagogical Sciences of the USSR
- The age of psychosocial development according to Ericon Erikon
- Periodization of age groups from WHO
Calculator of the age
Planetcalc 9000 9000 in the fields of the calculator on your own and it will instantly show the age in years and days. This online age calculator will help you calculate how old a person is by date of birth to the nearest minute, if you know what day and what time he was born.
Suitable for both parents to find out the age of the child: infants, preschoolers and older. Also, such an accurate calculation can be useful at a birthday party even for an adult, it would be interesting how many days, hours, minutes and seconds he lives and prepare, for example, a cake with an exact number by a certain time.
Of course, it is strange that someone does not remember his age, but sometimes in a dispute or just for fun, you can count the number of days and hours of life from birth!
Age classification by the Academy of Pedagogical Sciences of the USSR
In Russia, the age classification adopted at the symposium of the Academy of Pedagogical Sciences of the USSR in 1965 is still used.
Since none of the ministries and departments introduced a new periodization of age groups, we can use what we inherited from the USSR:
- The neonatal period is the first 4 weeks.
- Nursing period - 4 weeks to 1 year.
- Early childhood - 1-3 years.
- Preschool age - from 3 to 6-7 years old.
- Junior school age - from 6-7 to 10-12 years old.
- Adolescence - from 10-12 to 17-18 years old.
- Youth period:
- youth: 17-21 years old.
- girls: 16-20 years old.
- Mature age (1 period):
- men 21-35 years old.
- women aged 20-35.
- Mature age (2nd period):
- men 35-60 years old.
- women aged 35-55.
- Old age:
- men 60-75 years old.
- women aged 55-75.
- Old age — 75-90 years.
- Long-livers - 90 years or more.
Age of psychosocial development according to Erik Erikson
The German psychologist and psychoanalyst E. Erikson, known for his theory of the stages of psychosocial development, once identified 8 phases in the psychosocial development of a person. Each of these phases has an approximate correspondence to the age of a person:
- Infancy (from birth to 1 year).
