I agree John. I find it helps to keep the distinction between Excel and Access in mind if I simply use DateDiff as the go to function in Access. Dividing by 365.25 gives a more accurate calculation of years but, of course, datediff takes care of that for you.
Glenn
From: MS_Access_Professionals@yahoogroups.com [mailto:MS_Access_Professionals@yahoogroups.com]
Sent: Wednesday, September 21, 2016 9:08 AM
To: MS_Access_Professionals@yahoogroups.com
Subject: Re: [MS_AccessPros] Age calculation
Glenn & Robin-
You CAN subtract one date from another in Access to get the number of days between the two, and you COULD divide the result by 365 to get a rough approximation of the number of years. But if you want to be exact, you have to adjust based on whether the current date is before or after the month and year of the birthday. Here's the expression from the website:
DateDiff("yyyy", [Bdate], Now())+ _
Int( Format(now(), "mmdd") < Format( [Bdate], "mmdd") )
That uses DateDiff you get the number of years between the birthdate and the current date, but it could be off by as much as one year. For example, if you subtract December 31, 2015 from January 1, 2016, you get one year. The second part of the expression takes care of that by adding the result of finding out whether the current month and year ("mmdd") is less than the month and year of the birth date. That's a boolean expression that will either return True (-1 when converted to an integer) or False (0). So, it SUBTRACTS one if the current month and day are less than the month and day of the birthdate. In my example above, "0101" is less than "1231", so the result is correctly adjusted.
John Viescas, Author
Effective SQL
SQL Queries for Mere Mortals
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications
(Paris, France)
On Sep 21, 2016, at 2:36 PM, 'Glenn Lloyd' argeedblu@gmail.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:
Robin,
If you work in both Excel and Access, working with date information can be confusing. As Duane has pointed out the Access Date() function returns the current date. Access does not have a Today() function. The Excel Date() function returns the serial number for the y,m,d arguments you send to the function. It is common in Excel to simply subtract one date from another. As John has pointed out, we use the Access DateDiff() function to perform that sort of operation.
Glenn
From: MS_Access_Professionals@yahoogroups.com [mailto:MS_Access_Professionals@yahoogroups.com]
Sent: Wednesday, September 21, 2016 5:14 AM
To: MS_Access_Professionals@yahoogroups.com
Subject: Re: [MS_AccessPros] Age calculation
Robin-
Use the DateDiff expression or the Age function on the page Duane pointed out. The CalcAge Sub uses additional arguments to return its calculations, so it won't work called from a query.
John Viescas, Author
Effective SQL
SQL Queries for Mere Mortals
Microsoft Access 2010 Inside Out
Microsoft Access 2007 Inside Out
Microsoft Access 2003 Inside Out
Building Microsoft Access Applications
(Paris, France)
On Sep 21, 2016, at 9:16 AM, Duane Hookom duanehookom@hotmail.com [MS_Access_Professionals] <MS_Access_Professionals@yahoogroups.com> wrote:
You've missed on basically all cylinders. You are close to getting the age in days, not years. Date() returns today's date. You should also make sure DOB always contains an actual date.
Most of us use a function of expression like http://access.mvps.org/access/datetime/date0001.htm
Regards,
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Posted by: "Glenn Lloyd" <argeedblu@gmail.com>
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