Groupby Year for a date field in excel table

[Satyajit]

Hi, I am new PowerApps. I need your help. I want to build a chart to show number of associates joined on each year. In excel table, I have date of join field. I am using following query, but it is not giving me desire result (in fact showing some error - The GroupBy is having invalid argument. Expecting number, but having text value). Can you please help me by pointing out where I am doing wrong?

AddColumns(
    GroupBy(
        hctable,
        Year(DateValue(Date_of_Join_Org)),
        "joindate"
    ),
    "Countofassociates",
    CountRows(joindate)
)

Here, hctable is the table name, Date_of_Join_Org is the field having various dates in mm/dd/yyyy format.

[rebeccas]

Try this: 

For your Gallery Items:

GroupBy(AddColumns(hctable, "Year", Year(Date_of_Join_Org)),"Year","GrpByYear")

Then in your gallery you can have a label that is : ThisItem.Year (if you want)

From there you can refer it it...example:

Label = CountIf(hctable, Year(Date_of_Join_Org)=ThisItem.Year)

I use sharepoint so it does not need the DateValue() part, not sure if you do for excel.

[Satyajit]

Thank you Rebecca. I could implement this using the gallery. However, not able to bring that as Pie Chart (or any other chart form). Further help will be appreciated.

[rebeccas · Accepted solution]

When I want the data to show in a chart I put it in a collection and then set that collection for the items of the chart. 

Screens OnVisible:

ClearCollect(CollYearCount,

AddColumns(GroupBy(AddColumns(hctable, "Year", Year(Date_of_Join_Org)),"Year","GrpByYear")

,"CountYear",CountRows(GrpByYear)))

So you put that on the screens OnVisible (then click to another screen and back so it is created) and then you can put in your chart and set the Items of it to CollYearCount. 

[Satyajit]

Thanks for the help. It really worked