Create a biweekly/fortnighly column

[Anon29]

Hi all, I am having trouble trying to create a biweekly/fortnightly column for a date slicer that resets itself back to "Fortnight 1". 

I want it to work similar to how the weeknum works, and it resets the fortnight back to first fortnight number after "Fortnight 26". 

Any help would be appreciated

[amitchandak]

@Anon29 , Create week start date

Week Start date = 'Date'[Date]+-1*WEEKDAY('Date'[Date],2)+1
Week End date = 'Date'[Date]+ 7-1*WEEKDAY('Date'[Date],2)

Year Week Start date =

var _date = date([year]),1,1)

return

_date +-1*WEEKDAY(_date ,2)+1 

Bi Week number =

quotient(datediff([Year Week Start date], [Week Start date], day),14) + 1

Bi Week Start Date=

[Year Week Start date] * 14 ([Bi Week number]-1)

For this vs last follow rank as week

Power BI — Week on Week and WTD
https://medium.com/@amitchandak.1978/power-bi-wtd-questions-time-intelligence-4-5-98c30fab69d3
https://community.powerbi.com/t5/Community-Blog/Week-Is-Not-So-Weak-WTD-Last-WTD-and-This-Week-vs-La...
https://www.youtube.com/watch?v=pnAesWxYgJ8

[Anon29]

Thanks for your help @amitchandak but this variable keeps giving me an error saying incorrect syntax.

var _date = date([year]),1,1)