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Posts: 10
Registered: ‎01-02-2019
Accepted Solution

Creating a custom Week Number variable in a date table

Hi all. I need to create a Week Number column in a date table, but the WEEKNUM function doesn't produce quite the right results.

 

For the purposes of this variable, weeks start on Sunday. The part where it gets tricky is around the end/beginning of a year.

 

If the last Sunday of the year falls on December 29, 30, or 31, then I need the following set of 7 days (including the last Sunday in December) to be assigned a week number of 1. If the last Sunday of December falls on December 25, 26, 27, or 28 I need the following set of 7 days (including the last Sunday of December) to be assigned to week 52 or 53 or 54 or whatever is appropiate that year. The end result is that fo some years, there will be some dates in December assigned to week 1, and in other years there will be some days in January that are assigned to week 52 or 53 or 54.

 

Here are a couple examples of what the output should be:

 

Day

Date

Week Number

Saturday

12/29/2018

52

Sunday

12/30/2018

1

Monday

12/31/2018

1

Tuesday

1/1/2019

1

Wednesday

1/2/2019

1

Thursday

1/3/2019

1

Friday

1/4/2019

1

Saturday

1/5/2019

1

Sunday

1/6/2019

2

 

 

Day

Date

Week Number

Saturday

12/26/2015

52

Sunday

12/27/2015

53

Monday

12/28/2015

53

Tuesday

12/29/2015

53

Wednesday

12/30/2015

53

Thursday

12/31/2015

53

Friday

1/1/2016

53

Saturday

1/2/2016

53

Sunday

1/3/2016

1

 

 

I appreciate any help!


Accepted Solutions
Super User
Posts: 746
Registered: ‎09-16-2018

Re: Creating a custom Week Number variable in a date table

try adding a calculated column with this formula

 

=WEEKNUM( [Date] + 1, 21 )


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All Replies
Super User
Posts: 746
Registered: ‎09-16-2018

Re: Creating a custom Week Number variable in a date table

try adding a calculated column with this formula

 

=WEEKNUM( [Date] + 1, 21 )


Did I answer your question? Mark my post as a solution!


Proud to be a Datanaut!

Frequent Visitor
Posts: 10
Registered: ‎01-02-2019

Re: Creating a custom Week Number variable in a date table

Wow, that was remarkably simple! Thanks so much!