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Anonymous
Not applicable

## Create date range column for weeks in DAX

So I have a list of dates (from Monday, December 10, 2018 onwards) in a table. It's a table originally created in the Data View, so is not a query and cannot be edited in the Query Editor.

I want to assign each of these dates to calendar weeks starting on Monday, and have a calculated column that displays the first date in the week and the last date in the week, e.g.:

 Monday, December 10, 2018 10/12/2018-16/12/2018 Tuesday, December 11, 2018 10/12/2018-16/12/2018 Wednesday. December 12, 2018 10/12/2018-16/12/2018 Thursday, December 13, 2018 10/12/2018-16/12/2018 Friday, December 14, 2018 10/12/2018-16/12/2018 Saturday, December 15, 2018 10/12/2018-16/12/2018 Sunday, December 16, 2018 10/12/2018-16/12/2018 Monday, December 17, 2018 17/12/2018-23/12/2018 Tuesday, December 18, 2018 17/12/2018-23/12/2018

Any ideas on how I could write a formula to achieve this?

1 ACCEPTED SOLUTION
Community Support

@Anonymous,

You may try DAX like pattern below(maybe some mistakes but hope it can guide you):

Result =
VAR seperator =
FIND ( "-", SUBSTITUTE ( Table1[Date], "-", "," ) )
VAR weekday =
LEFT ( Table1[Date], seperator - 1 )
VAR _date =
RIGHT ( Table1[Date], LEN ( Table1[Date] ) - seperator )
RETURN
SWITCH (
weekday,
"Monday", CONCATENATE ( _date, CONCATENATE ( "~", _date + 6 ) ),
"Tuesday", CONCATENATE ( _date - 1, CONCATENATE ( "~", _date + 5 ) ),
"Wednesday", CONCATENATE ( _date - 2, CONCATENATE ( "~", _date + 4 ) ),
"Thursday", CONCATENATE ( _date - 3, CONCATENATE ( "~", _date + 3 ) ),
"Friday", CONCATENATE ( _date - 4, CONCATENATE ( "~", _date + 2 ) ),
"Saturday", CONCATENATE ( _date - 5, CONCATENATE ( "~", _date + 1 ) ),
"Sunday", CONCATENATE ( _date - 6, CONCATENATE ( "~", _date ) )
)

Community Support Team _ Jimmy Tao

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

4 REPLIES 4
New Member

Hello, this is very useful, but what if you year does not begin with Monday ? For instance 2023 starts on a Sunday. Thus, with this formula we have Week 1 = 12/26/22 - 1/1/2023 and 1/2/2023 - 1/8/2023. How could we manage this case please?

Community Support

@Anonymous,

You may try DAX like pattern below(maybe some mistakes but hope it can guide you):

Result =
VAR seperator =
FIND ( "-", SUBSTITUTE ( Table1[Date], "-", "," ) )
VAR weekday =
LEFT ( Table1[Date], seperator - 1 )
VAR _date =
RIGHT ( Table1[Date], LEN ( Table1[Date] ) - seperator )
RETURN
SWITCH (
weekday,
"Monday", CONCATENATE ( _date, CONCATENATE ( "~", _date + 6 ) ),
"Tuesday", CONCATENATE ( _date - 1, CONCATENATE ( "~", _date + 5 ) ),
"Wednesday", CONCATENATE ( _date - 2, CONCATENATE ( "~", _date + 4 ) ),
"Thursday", CONCATENATE ( _date - 3, CONCATENATE ( "~", _date + 3 ) ),
"Friday", CONCATENATE ( _date - 4, CONCATENATE ( "~", _date + 2 ) ),
"Saturday", CONCATENATE ( _date - 5, CONCATENATE ( "~", _date + 1 ) ),
"Sunday", CONCATENATE ( _date - 6, CONCATENATE ( "~", _date ) )
)

Community Support Team _ Jimmy Tao

If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Anonymous
Not applicable

Hi Jimmy,

This worked for me great, slightly tweaked as follows:

Calendar Week Date Range =
VAR separator =
FIND("-",SUBSTITUTE(FORMAT('6 Date Table'[Date],"Long Date"),", ","-"))
VAR weekday =
LEFT(FORMAT('6 Date Table'[Date],"Long Date"), separator - 1)
VAR _date =
RIGHT(FORMAT('6 Date Table'[Date],"Long Date"),LEN(FORMAT('6 Date Table'[Date],"Long Date")) - separator)
RETURN
SWITCH (
weekday,
"Monday",CONCATENATE(FORMAT(_date + 0,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 6,"dd/mm/yyyy"))),
"Tuesday",CONCATENATE(FORMAT( _date - 1,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 5,"dd/mm/yyyy"))),
"Wednesday",CONCATENATE(FORMAT(_date - 2,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 4,"dd/mm/yyyy"))),
"Thursday",CONCATENATE(FORMAT(_date - 3,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 3,"dd/mm/yyyy"))),
"Friday",CONCATENATE(FORMAT(_date - 4,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 2,"dd/mm/yyyy"))),
"Saturday",CONCATENATE(FORMAT(_date - 5,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 1,"dd/mm/yyyy"))),
"Sunday",CONCATENATE(FORMAT(_date - 6,"dd/mm/yyyy"),CONCATENATE("-",FORMAT(_date + 0,"dd/mm/yyyy")))
)

This was a great learning exercise for me! Thanks so much for your help!

New Member

This was a great thread and helped me preparing a report I was looking forward to, but I just wanted to know if there is a way we can only keep the date range from Monday till Friday, please suggest. Thank you!

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