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Find the number of years, months, weeks, and days between dates. Click "Settings" to define holidays.

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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

Calculate your due date: How to find your baby's due date

Choose a calculation method Last periodConception dateI know my due date

First day of my last period

BabyCenter's Due Date Calculator

Use our pregnancy due date calculator by plugging in either the date of your last menstrual cycle or the date you know you conceived. The calculator will do the rest.

How is my due date calculated?

There are several ways your due date is determined. If you happen to know the day you conceived, you can count 38 weeks from that day to find your due date. (Human gestation takes about 38 weeks.)

But very few expectant moms know exactly when they conceived. Even if you only had sex once during your fertile period, you wouldn't conceive on that day unless you happen to be ovulating. Sperm can live for up to five days inside your fallopian tubes. So, it could be up to five days after you have sex that you release an egg (ovulate) and it gets fertilized by a waiting sperm. That's the day you conceive.

So, without knowing the day of conception, how does anyone determine a due date?

First day of your last period

The most common way to calculate your pregnancy due date is by counting 40 weeks from the first day of your last menstrual period (LMP). And that's how most healthcare providers do it.

If your menstrual cycle length is the average length (28-day cycle), your menstrual cycle probably started about two weeks before you conceived. This explains why pregnancies are said to last 40 weeks instead of 38 weeks.

This method doesn't take into account how long your menstrual cycle actually is or when you think you might have conceived. But generally speaking, women typically ovulate about two weeks after their menstrual cycle starts. And women are more likely to know when their last period started than the day they ovulated.

Conception date

If you do happen to know precisely when you conceived – say, if you were using an ovulation predictor kit or tracking your ovulation symptoms – you can calculate your pregnancy due date based on your conception date. Just choose that calculation method from the pulldown above and put in your date.

Note: Again, you don't necessarily conceive on the day you have sex.

IVF transfer date

If you conceived through IVF, you can calculate your due date using your IVF transfer date. If you had a Day 5 embryo transfer, count 261 days from your transfer date. If you had a Day 3 embryo transfer, count 263 days.

Can my due date change?

Your healthcare provider might revise your due date if your baby is measured during a first trimester ultrasound scan and found to be much bigger or smaller than expected for gestational age. This is more likely to happen if you have an irregular menstrual cycle length that makes it hard to pinpoint the date of conception.

Your healthcare provider will measure your baby during that ultrasound exam to figure out how far along your baby is and then provide you with a new due date.

What if I already know my due date?

If you already know your due date, you can use this calculator to see your pregnancy timeline. It will tell you when you'll hit various milestones, and when you may be due for prenatal tests and prenatal visits. You'll also find what your baby's sign and birthstone will probably be and which famous people were born on your due date.

How likely am I to give birth on my due date?

Of course, a due date calculation is always approximate, whether it's from our tool or from your doctor or midwife. Only 1 in 20 women delivers on their due date. You're just as likely to go into labor any day during the two weeks before or after.

Want more information about how the weeks, months, and trimesters of pregnancy are counted? See our pregnancy timing chart.

How soon can I take a pregnancy test?

With all this talk about pregnancy due dates, you may be wondering when you can take a pregnancy test. To ensure you get the most accurate reading, it's best to wait a few days after your missed period to take a pregnancy test.

At-home urine tests measure the amount of hCG (human Chorionic Gonadotropin) present in your body. If you take a pregnancy test before you miss your period, you may not get an accurate result, despite what some tests advertise.

If you're getting a blood test in your provider's office, you may get results sooner. These tests also measure the amount of hCG in your bloodstream, but they're more sensitive than at-home urine tests. Blood tests may be able to detect pregnancy six to eight days after ovulation.

Read more

• Your pregnancy, week by week
• Your first trimester pregnancy checklist
• Pregnancy Weight Gain Calculator
• Ovulation Calculator
• See all tools

Age by date of birth (date of marriage, ...)

Today

Important date
12345678910111213141516171819202122232425262728293031JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember

Use the calendar calculator to find out

1. how old the person is, what day of the week was on the date of his birth (date of birth should be indicated),
2. how much time has passed since Victory Day in the Great Patriotic War (should indicate 9May 1945),
3. how long the employee has (the date of employment should be indicated),
4. how many years Pugacheva and Galkin have been married (the date of their wedding should be indicated on December 23, 2011).

Age calculation is possible in months, weeks, days. If you need in hours, minutes or seconds, then let me know in the comments, I will finalize it.

Age calculation in months and years - Office

Twitter LinkedIn Facebook E-mail address nine0003

• Article
• 10/13/2022
• Reading takes 2 minutes

• Applies to:

  Access 2007, Access 2003, Access 2002

  nine0343

Optional: Programming experience, interaction and multi-user skills required.

This article applies to a Microsoft Office Access database (ACCDB and MDB) and a Microsoft Access project (APD).

Abstract

This article shows you how to create two functions that you can use to calculate the age of a person or object based on a specified date.

Note.

You can see a demonstration of the method used in this article in the sample Qrysmp00.exe file. nine0003

Creating functions

Enter or paste the following code into the module:

 '================================= ========================= ' General Declaration '=============================================== ========= Option Explicit '******************************************************* ************ ' FUNCTION NAME: Age() ' ' PURPOSE: ' Calculates age in years from a specified date to today's date. ' ' INPUT PARAMETERS: ' StartDate: The beginning date (for example, a birth date). ' ' RETURN 'Age in years. ' '******************************************************* ************ Function Age (varBirthDate As Variant) As Integer Dim varAge As Variant If IsNull(varBirthdate) then Age = 0: Exit Function varAge = DateDiff("yyyy", varBirthDate, Now) If Date < DateSerial(Year(Now), Month(varBirthDate), _ Day(varBirthDate)) Then varAge = varAge - 1 End If Age = CInt(varAge) end function '******************************************************* ************ ' FUNCTION NAME: AgeMonths() ' ' PURPOSE: ' Compliments the Age() function by calculating the number of months ' that have expired since the last month supplied by the specified date. ' If the specified date is a birthday, the function returns the number of ' months since the last birthday. ' ' INPUT PARAMETERS: ' StartDate: The beginning date (for example, a birthday). ' ' RETURN ' Months since the last birthday. '******************************************************* ************ Function AgeMonths(ByVal StartDate As String) As Integer Dim tAge As Double tAge = (DateDiff("m", StartDate, Now)) If (DatePart("d", StartDate) > DatePart("d", Now)) Then tAge = tAge - 1 End If If tAge < 0 Then tAge = tAge + 1 End If AgeMonths = CInt(tAge Mod 12) end function nine0363 
 Testing the Age() and AgeMonths() functions 
 
 To test the Age() and AgeMonths() functions, do the following. 
 
 Important! 
 
 The following describes how to change the date on the computer. Make sure you follow step 6 to reset the date to the current date. 
 
 
 
 Use the date and time tool in the control panel to record the current date, and then set the date to June 3, 2001. 
 
 
 
 Open a module or create a new one. nine0003 
 
 
 On the View menu, click Immediate Window. 
 
 
 
 Assume that a friend's date of birth is November 15, 1967, and today is June 3, 2001. Type the following line in the Immediate window and press ENTER: 
 
? Age("11/15/67") 
 
 Note that Microsoft Access responds with 33 (years). 
 
 
 
 Type the following line and press ENTER: 
 
? AgeMonths("11/15/67") 
 
 Note that Microsoft Access returns a value of 6, indicating that six months have passed since this person's last birthday. Your friend is 33 years and six months old. nine0003 
 
 
 Use the date and time tool in the control panel to reset the date to the current date specified in step 1. 
 
 
 
 Using the Age() and AgeMonths() functions 
 
 The following procedure explains how to mark old orders by placing an age value in a new control. 
 
 
 
 In the sample database Northwind. 
Learn more

		
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