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MS Access Days of the week

Posted on 2013-12-31
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Last Modified: 2013-12-31
I need to find all the dates in the last 6 weeks which fell on a Tuesday.  I've gone round and round so far, I can find which day a date is, but can't get the logic right to find all Tuesdays.  Thanx in advance.
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Question by:NoGurru
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Boyd (HiTechCoach) Trimmell, Microsoft Access MVP earned 500 total points
ID: 39749341
Since you want all the data last 6 weeks I assume that means you need a query. And you want to filter the data to having data on Tuesday.

When you say the last 6 weeks I assume that means this week and the previous 5 weeks.
In my experience, the last 6 weeks (current week included) and the past six weeks (prior to  the current week)  are not the same.


To get the last full six weeks you will need to calculate the first day of the week for the date 5 weeks from today using:

dateadd("ww",-5,Date) - WeekDay(dateadd("ww",-5,Date)) + 1 ) 

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For the current data of 12/31/2014 then:
? dateadd("ww",-5,Date) - WeekDay(dateadd("ww",-5,Date)) + 1
11/24/2013 

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If you ran it on Friday 1/3/2014 is will still work:
? dateadd("ww",-5,#1/3/2014#) - WeekDay(dateadd("ww",-5,#1/3/2014#)) + 1
11/24/2013 

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Now that you can select all the data within the range you add an additional where criteria to select only Tuesdays/ with:


AND (Weekday([Your Date])=3)

Putting it all together, here is a query using the orders table in the Northwind database

SELECT Orders.[Order ID], Orders.[Order Date], Weekday([Order Date]) AS DOW
FROM Orders
WHERE (((Orders.[Order Date]) Between (DateAdd("ww",-5,Date) - WeekDay(DateAdd("ww",-5,Date)) + 1 ) AND ((Weekday([Order Date]))=3));

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It returns  all the order where the data is in the past 6 full weeks from the current date and the date is a Tuesday.
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Author Closing Comment

by:NoGurru
ID: 39749362
Thank you for the fast feedback.
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