POWER BI

去年：year(today())-1，例如今年是2021年，那么year(today())-1 = 2020年。

创建相关的年初、末的参数：

I've created  (measures) for relative variable year start and end e.g.

This year

Var TY Start = Date(Year(Today()),01,31)

Var TY End = Date(Year(Today()),12,31)

Last Year

Var LY Start = Date(Year(Today())-1,01,31)

Var LY End = Date(Year(Today())-1,12,31)

Then I used the variables in the Calculate Measure:

LY Sales = Calculate(sum([sales]),

                                 Datesbetween(Dates[Calender],

                                 [Var LY Start], [Var LY End]

                                 ) 

So to go 2 years back I created more variables for start and end and -2 of the year etc. This is working for me. I know there are probably alot cleaner and smarter ways of doing this, but this was a quick fix for me to create a variable relative to todays date.

ref：Solved: Basic previous year measure - Microsoft Power BI Community

power query：今年2021年份获取 思路：

获取当天日期

DateTime.Date(DateTime.LocalNow())

获取今年年份：Date.Year(DateTime.Date(DateTime.LocalNow()))

ref：Date.Year - PowerQuery M | Microsoft Docs

自定义列custom column也会用到power query：思维导图