Calculating Dates
Feb 23, 2006
I have a table "main" with 2 colums (main_id,date_out). This table has a link to the table "refill". This table has 3 colums (refill_id, main_id, refill_date).
Example data:
TABLE MAIN
main_id - data_out
01 - 01/01/2006
TABLE REFILL
refill_id - main_id - refill_date
01 - 01 - 10/01/2006
02 - 01 - 16/01/2006
03 - 01 - 21/01/2006
When I make a simple selectquery with the fields main.date_out and refill.refill_date I become the the next result.
01/01/2006 - 10/01/2006
01/01/2006 - 16/01/2006
01/01/2006 - 21/01/2006
Now the problem.
I have to calculate the days between the main and refill dates
01/01/2006 - 10/01/2006 ( is the same as above)
10/01/2006 - 16/01/2006
16/01/2006 - 21/01/2006
suggestions????......thanks
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Sep 26, 2006
i'm trying to create a query which looks at the field dateEntered and then returns the previous sunday date of that week.
ex.
dateEntered returnedSundayDate
09/26/2006 09/24/2006
are there built in access functions to figure this out in a query?
please help.
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Jun 27, 2005
In access in one field I have one date and in another field I have another date. I want to calculate the number of years.,months and days elapsed between these two date. e.g. suppose in one field I have 30.06.2005 and in other 20.04.2004 then it should show 1 year 2 months and 10 days.
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Jan 13, 2006
Hello,
I'm trying to get a number of days between an employee's hire date and today's date. The employee is supposed to change levels every year until reaches 6 yrs. The sample employee hired on 11/13/2001 and today's date is 1/13/2006, so it should be only 4 yrs (level 04). I tried assigning the levels with this function DateDiff('d',[STEP TABLE].[Hire Date],Date()) AS [Total days] and also with this code below.
Switch([Total Days] Between 0 And 365,"Lvl 01",[Total Days] Between 366 And 730,"Lvl 02",[Total Days] Between 731 And 1095,"Lvl 03",[Total Days] Between 1096 And 1460,"Lvl 04",[Total Days] Between 1461 And 1825,"Lvl 05",[Total Days]>1825, "Lvl 06", [Total Days]=0,Null)
The function's results gives me 1522 days and according to my code the level is "05" (5 yrs). What am I doing wrong? Should I use a different function to calculate the days, so in this case would be 4 yrs and not 5?
Please help!
thanks,
Pablo:confused:
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Sep 11, 2013
i want to calculate a date
Code:
Dim enddate As Date
Dim startdate As Date
Dim running_time As Double
startdate = Me.startdate
running_time = Me.running_time
endate = stardate + running time
Me.enddate = enddate
The running time is in year.If i calcluate right now, the System things the running time is in days. How can i say that the running time is in years.
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Feb 22, 2006
I have attached a really simple db where in a query I'm trying to determine the elapsed time between A sent date and a received date. Can some tell me what I'm doing wrong? Thanks..
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Mar 15, 2006
I have a library system and i need to work out the number of days from the date the book was due and the current date. Could anyone help me.
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Dec 27, 2007
Calculating dates between TWO date ranges:
I've read alot of good things on here regarding the DateDiff function and some other things that have helped me out finding the difference between two dates within the same entry on a table. I have a question regarding finding the difference in days between two entries within the same table.
Example:
test table:
Date ID # Name
1/18/07 1234567 Smith
1/20/07 1234567 Smith
1/23/07 1234567 Smith
Is there a way to find the difference in days between the lowest and highest dates? I want to know how many days are between the first entry and the last entry? In this cae it would be five days. I can do it if the days are in the same entry with the datediff function, but having trouble finding it in this situation. Any pointers?
(Thanks for all the good information on this site, BTW. I've seen a few posts similar to this, but it didn't really answer my question)
Don
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Dec 9, 2005
I have a form with two date fields: "Initiation_date", and "Correction_date". There is a third field called "Duration". I would like to store the values of all three fields in the corresponding table. "Duration" (Long Integer) would be the number of days from "Initiation_Date" to "Correction_Date" if Correction date is there, or to Date() if Correction date is Null.
I can use an unbound text box to get "Duration_cal" using the following as a control source:
=IIf(IsNull([VCor_date]),DateDiff("d",[VInit_date],Date()),DateDiff("d",[VInit_date],[VCor_date]))
But I cannot get that value (No.of Days) in to the "Duration" field. The reason I want to have "Duration" stored as a number is that it is being used in a query for another calculation (total days used for selected records).
Is there a simple way to accomplish this?
Thanks
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Nov 18, 2011
I currently have a table that has patient ID (unique record (SSN)) and a date of visit field. The SSN may have numerous rows with different dates of visits. What I am trying to do is a DateDiff function that will retrieve records that are 48 hours apart or 2 days apart. We are tracking patients that return within 48 hours of a previous visit.
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May 26, 2005
I am tring to add a number of years to a dob. I'm doing this by adding my
date+years*365.26 I get a string of numbers. I then convert the number in
the next column to actual date again. I'm getting the correct date. I've tried unsuccesfully to use the dateadd function.Now I want my criteria on that column to allow me to return only date in a given to from period of my choosing. I want to determine the date range each time I run the query.
An example would be:
DOB age date I need to follow up
5/15/1935 + 75 = 5/15/2005
Then I request dates between 4/1/05 and 5/30/05 and this date is returned.
I've tried the between_and functions but nothing is returned. I'm guessing it's because the column is still a calculation and not a true date.
I've tried: Adding a column to my query to convert the number string back to
date format (criteria failed to return a result). Adding a second column
that ='s my converted number to date column (criteria failed to return a
result)
And I've tried the make table query and then run another query from the new table. I can't seemto make this happen. I think it's not recognizing my data as a date because it isn't returning any data.
Is ther an easier way to: Add a number of years to a date and have it return
a date and not the number string?
If not is there a better way to convert the string to a date?
Is there a way to get my criteria to recognize the date and return date
between my begin and end dates?
Thanks
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Oct 25, 2013
I have a list of client activity - client name, loan ID and loan date. I would like to create a new field that shows the number of days between one loan and the next. If I was doing it in excel, I would need to sort the data by client name and loan date and then calculate the number of days between the loan date of one loan and the loan date of the loan immediately prior to this.
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May 29, 2005
In my Query I have a Date Received field and a Date Approved field.
I would like to calculate the number of work days, which excludes weekends, between Date Received and Data Approved fields.
It would be more desirable to calculate the number of work days, excluding weekends and governmnet obsereved holidays.. but I don't know if that can be done... If not I can stick with the number of work days excluding weekends.
How would I go about doing this? I would need to add a new column to my query?
What would I put for the field and criteria? What kind of expression do I use?
Any help will be appreciated, thanks
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Mar 16, 2008
Any ideas on calculating future dates based on # of working hours. For example... If a task is suppossed to be completed in 32 business hours, when would that be? Considerations include standard working hours M-F, no working hours on weekend. I have to believe that someone has written this before and I don't need to reinvent the wheel. ANy help is much appreciated!
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Dec 14, 2013
I have a query that records a status update, and the date it was made by an employee etc. The table has a secondary key related to ... lets say a project table.
E.g.
Status Id; EmployeeID;ProjectsID;Status;Date
I want to calculate the average amount of days it takes for a status change occur.
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Jul 19, 2013
Find the difference between two dates is simple if you're simply looking for the number of days between them. However, if you're looking to express the difference in a bit more user-friendly way, you can use the following code to calculate the difference in years, months, and days. The code accounts for zero values, plurals and the Oxford comma. Further, it automatically sets the later of the two dates to the End date, so the dates can be used interchangeably.
Examples:
June 4, 2010, July 3, 2012 returns "2 Years and 29 Days"
June 4, 2010, July 5, 2011 returns "1 Year, 1 Month and 1 Day"
June 4, 2010, June 5, 2010 returns "1 Day"
Code:
Function DiffOfTwoDates(dtmDate1 As Date, dtmDate2 As Date) As String
' Written by Will Knapp, Freelance Access Developer, 2013
Dim dtmStart As Date, dtmEnd As Date
Dim strDiff As String ' Resulting String
Dim yDiff As Integer ' Year Difference
Dim mDiff As Integer ' Month Difference
Dim dDiff As Integer ' Day Difference
Dim CommaLoc As Integer
[code]....
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Jan 24, 2008
Hi, I am a longtime Excel user, and am now migrating some work to Access.
I have 2 fields dealing with dates in the format mm/dd/yyyy hh:mm, OPEN and CLOSE
I'd like to get the difference between the two in hours, but I have no idea how or where to do this in Access. I'm assuming it is put into the queries, but it would be easier if I could just put it in the table.
Here is an example
1/1/2008 1:00 1/2/2008 2:00
I want the result to be "25"
Thanks in advance!
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Feb 28, 2008
Hi everyone
I'm a very very new access user so many apologies in advance for when I have no idea what I"m talking about.
I'm working on creating a report that will display multiple expiration dates. Currently I have an employee database, not created by me, that has all of our employees professional licenses listed.
Prof license, auto license, liability, etc.
I want to create a report that will tell me what has already expired or will expire in the next 30 days.
I did use this
Between DateAdd("d",-30,Date()) and Date() and it is bringing back info up to 2009. which isn't what I need. I'm sure I'm doing something wrong here.
I want anything that has expired regardless of the date from today, before today, and 30 days from today but I don't care about anything more than 30 days from today's date.
I noticed that when I looked at the existing database that the fields are set as text fields. I tried to change them to dates and it gave me a "deleting 106" records error message. Yikes!
Any help would be appreciated. I don't really understand expressions and I don't understand if I'm supposed to put the actual date in parentheses or what. Please pardon my ignorance.
Many many thanks.
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Nov 8, 2012
I have just started using Access 2010. I need to calculate student's ages from their date of birth to today's date. I have a column set up for the date of birth but can't figure out how to get this figure.
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May 12, 2014
Any way to have a form with Dates as column headers to update a table where the dates are stored in rows???
The table set up is like this:
tblOpHdr
DiaryID (PK) - OpDate (Date)
tblOpDetail
DiaryID (FK) - CostCode - MachineNumber - MachineHours - etc
I'm just wondering if there's any way I can do this with a datasheet or a crosstab type setup?
It's Access 2010.
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Aug 28, 2013
I have built a query to calculate the expiry dates of training courses but I am trying to input a criteria so that only dates within 90 days of todays date show. I am using Date()<90 but it doesn't return the correct information. What the criteria should be for this?
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Apr 9, 2015
I have a table of records, which has within it two date fields (effectively, a 'start' and 'end' date for that particular record)
I now need to create a query to perform a calculation for each date between the 'start' date and the 'end' date
So the first step (as I see it anyway) is to try to create a query which will give me each date between the two reference dates, in the hope that I can then JOIN that onto another query to perform the necessary calculation for each of the returned dates.
Is there a way to do this?
So basically, if for a particular record, the 'start' date is 01-Apr-2015 and the 'end' date is 09-Apr-2015, can I produce a dataset of 9 records as follows :01-Apr-2015
02-Apr-2015
03-Apr-2015
04-Apr-2015
05-Apr-2015
06-Apr-2015
07-Apr-2015
08-Apr-2015
09-Apr-2015
(The *obvious* solution would be to create a separate table of dates, from which I could just SELECT DISTINCT <Date> Between #04/01/2015# And #04/09/2015# - but that seems like a dreadful waste of space, if that table is only required to generate the above? And it would have to cover all possible options; so it would either have to be massive, and contain every possible date - ever! - or maintained, adding new dates as necessary when they are required. Seems horribly inefficient!)
Is it possible to just select each date between the two reference dates? Or can you only query something which exists somewhere in a table?
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Sep 7, 2006
Hiya-
I have a database with 5000 entries, corresponding to about 10 entries for about 500 people. Each of the entries is dated, and I need to calculate the time intervals between each person's sequential entries in the table.
One way of doing this is to create another column that contains the date of the previous entry. I can then use DateDiff to subtract one date from the other and give me the difference in days.
This approach falls down if I then work with only a subset of the entries - I would have to re-enter the previous entry dates as the time intervals would have changed.
What I really need is a way of subtracting the date from the date in the cell directly above it. Will Access let me do this, or is there a better way?
Many thanks, Jules.
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Jul 8, 2014
I have two tables with dates. Between (!) every two following dates in table1, I want to know the number of dates in table2. How do I write an SQL query for this? The tables I have are up to a few hundred records in table 1 and a few thousand records in table2. So to prevent that this takes hours I need a fast query.
To explain the query I need, for example:
table1
01/01/2014
15/01/2014
17/01/2014
30/01/2014
table2
01/01/2014
02/01/2014
05/01/2014
17/01/2014
18/01/2014
20/01/2014
21/01/2014
25/01/2014
So the answer of the query would be 2,0,4.
Explanation:
Between 01/01/2014 and 15/01/2014 in table 1 there are 2 dates in table2 (01/01/2014 is not included between the dates)
Between 15/01/2014 and 17/01/2014 in table 1 there are 0 dates in table 2
Between 17/01/2014 and 30/01/2014 in table 1 there are 4 dates in table 2
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Nov 15, 2011
I have a master table which shows all transactions per record (person) over a financial year.
Each record person has a seperate package period over which their spend needs to be measured. Therefore although I have all their transactions for the year, I only want to sum their transactions between their given [start date] and [end date] which are in columns.
I need to be able to create a field which sums all expenditure per record between the start and end dates
Name Start Date End Date Invoice Date Amount
Matt 15/5/11 15/9/11 1/11/11 £100
Matt 15/5/11 15/9/11 7/7/11 £200
Matt 15/5/11 15/9/11 12/12/11 £200
In this case I would only want to sum 7/7/11 as this is between the start and end dates
I want to write something like sumif([Invoice Date] is between [start date] and [end date] - not sure where or how exactly
(The start date and end date will always be the same per person)
Is this possible in access?
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Nov 3, 2005
Hi,
Please bear with me here as it's a little involved.
I'm doing a staff profile website which includes a section where they can enter their annual/other leave details.
I decided to store their leave in two fields Start_Date | End_Date rather than each individual date that they took - the short and wide approach vs long and narrow.
This has left me needing to do a query that would return all the dates between the start and end dates inclusive.
Example:
StaffID---Start_Date---End_Date
---1-----12/12/2004--14/12/2004
Returns:
StaffID---Leave_Dates
--1-------12/12/2004
--1-------13/12/2004
--1-------14/12/2004
I appreciate i could do this using some script to loop through a recordset and build an array of dates but i wondered/hoped that it could be done using SQL.
As it is an asp page i can't use user defined functions in a VBA module in Access so the solution would need to be pure SQL.
Is this possible?
Any help v.much appreciated.
TS
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