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Helper III
Helper III

Calculating age from a date and time

I'd be extreemly grateful if someone could help with this. I have a column containing date and time information. From this I need to create a new column which shows the age based on the date (in days).



I also have a seperate dataset with a start date and end date (date and time) which I need to calculate the days between the start and end.





Use "New Column" not "New Measure"

Lima - Peru

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Advocate I
Advocate I



another quick way to convert DOB to age:

  1. In Query Editor> select the column the contains DOB 
  2. Go to Date & Time Colmn section > Date> Select "Age"
  3. In Date & Time Colmn section > Duration > Select "Total Years"
  4. Highlight the transformed column, right click and select "Change Type"> Select "Whole Number"
  5. Rename the column

I had similar requirement of calculating age from DOB. 

This is the easiest way to implement.


Thank you!!

One issue with this method is that for anyone that is over 6 months into their "current" age, their age will be rounded up. E.g. 26.7 will be rounded up to 27.


The solution to this is before you convert the column to a whole number, instead right click on the column header and go to Transform -> Round -> Round Down.

Community Champion
Community Champion





To calculate the age in Days:


Age = DATEDIFF(Table1[DateTimeColumn],TODAY(),DAY)


to calculate the days between the start and end.


DaysBetween = DATEDIFF(Table1[StarDate],Table1[EndDate],DAY)

Lima - Peru


I used the Query Editor to "Insert a Custom Column" (Add Column tab).  I inserted the formula given here, but PowerBI doesn't seem to like the DATEDIFF function.  The system inserted the Table.AddColumn bit up to the DATEDIFF.

= Table.AddColumn(#"Removed Columns", "ItemAge", each DATEDIFF([FirstDetected],TODAY(),DAY))

 Advice welcome.

Thanks you...


I seem to have done something wrong (assuming it's me as a newbie):


21-04-2017 09-02-41.png



Use "New Column" not "New Measure"

Lima - Peru

Who wants an age in days? This is a silly solution!

Thank you for taking the time to help me, it's much appreciated.



My best guess is that you need to choose "New Column" first.

Specializing in Power Query Formula Language (M)

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