cancel
Showing results for
Did you mean:
Highlighted

## Possible Tip/Trick: Dynamic Date Dimension Table

I'm going to share the dynamic date dimension table I built, hopefully it is useful to someone!  I named it DateTable for this tutorial, and my fact table FactTable.

The table is built using the following formula:

DateTable = CALENDAR (MINX('FactTable', [Created Date]), NOW())

Basically, it looks for the oldest date you have for the column [created date], and builds a sequential date range until the time of refresh - so it always has calendar information for all data points in the set.

Date = This is built when you create the table

Year = YEAR([Date])

MonthofYear = MONTH([Date])

QuarterofYear = ROUNDUP (MONTH([Date])/3,0)

OrdinalDate = DATEDIFF([Year]&",1,1",[Date],DAY)+1

DayofWeek = WEEKDAY([Date],2)

ISOWeekofYear = IF ((([OrdinalDate] - [DayofWeek] + 10)/7) >= 53, 1, TRUNC(([OrdinalDate] - [DayofWeek] + 10)/7))

DayofMonth = DAY([Date])

Month = FORMAT([Date], "MMM") & " " & [Year])

Quarter = "Q" & [Quarter] & " " & [Year]

Week Ending = [Date] + (7- [DayofWeek])

Day = Format([Date],"DDDD")

With both the numeric and text values, you can use "Sort by" to properly order them in visuals.  If you want your week numbers to start on a Sunday instead of Monday, change the "1" to a "2" in ISOWeekofYear column - however ISO Standard is a Monday Start.

I'm still pretty new to PowerBI, but I'll help if I can!  If you have suggestions or modifications, I'd love to hear them.

EDIT:  I changed how the week number is calculated, so I can use ISO Week Numbers.  This also helped fix the "week Ending column, which broke when spanning multiple years that included a leap year.  Let me know if you find any problems!

EDIT2:  MS just released the timeline slicer for PowerBI.  That probably, mostly makes this table useless.  Read more here: http://blogs.msdn.com/b/powerbi/archive/2015/11/03/visual-awesomeness-unlocked-the-timeline-slicer.a...

39 REPLIES 39
Highlighted
Resolver II

Hi

Thanks for this

What would you do if you wanted more than one calendar. Say an Invoice Date plus an Order Date Calendar

Would you need two new tables or could one be set up (called  DateTable) and filter by date type in the measure somehow?

Is this possible

Thanks

EDIT. To do the above

Highlighted
Memorable Member

@ALeef Great Job..Only needs a SWITCH for the month names and set...

@RJ You can create a second Calendar or use the same with inactive relantionship & USERELANTIONSHIP.

Konstantinos Ioannou
Highlighted

@konstantinos : Why would you use a switch and type in all the names, rather than use the format function?  Is it a perfromance difference?

@RJ :  Check out http://community.powerbi.com/t5/Desktop/Transitive-Relationships/m-p/8563#U8563 .  It's an interesting concept, and apparently having inactive relationships is fine - the software is still smart enough to filter right through.  It wasn't exactly what I ended up using, but that's because I wasn't using a slicer, I wanted a clustered column chart.

Highlighted
Memorable Member

@ALeef Apologies..SWITCH is slower of course. To be honest I wasn't aware that FORMAT can return months and days due to always importing Date Table..

Thanks, always learning..

Konstantinos Ioannou
Highlighted
Resolver II

BTW I always use today() not now()

Does it make any difference?

Highlighted

TODAY() only returns a day, and sets the time to 12:00am.  For this instance, I don't think it matters, but I use timestamps regularly, so that is what I'm in the habit of.

Good question!

Highlighted
Regular Visitor

I am new to PowerBI and I don't understand how to actually create this table.

I tried creating a New Source -> Blank Query and inserting your query, but that doesn't seem to work.

Could you please add some more detailed steps on how to add it to the queries, for newbies like me? 🙂

Highlighted
Memorable Member

@bernitorres You can create/import tables with 2 ways. One is importing with "Get Data" and the other is through DAX data modelling.

You need to go to the data model view and in the ribbon go to modeling tab & select "New Table". thus using DAX language.

The "Get data" uses M language which is used only for importing data to data model.

Keep in mind that you need to already have import some data in order to see the :Modelling" tab..

Konstantinos Ioannou
Highlighted

@konstantinos has it right.  I made it using the New Table option on the ribbon.

Announcements

#### Power Platform Community Conference

Check out the on demand sessions that are available now!

#### Microsoft Power Platform Communities

Check out the Winners!

#### Create an end-to-end data and analytics solution

Learn how Power BI works with the latest Azure data and analytics innovations at the digital event with Microsoft CEO Satya Nadella.

Top Solution Authors
Top Kudoed Authors