Calculating YTD values with Variable End Fiscal Year date each year

Calvin69 , seem like you have a custom calendar like - https://amitchandak.medium.com/cheat-sheet-power-bi-4-4-4-and-4-4-5-calendar-786f76da7d92

Then you need year start date and day of year

Day of Year =datediff([Year Start date] , [Date],Day) +1

YTD= CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Year Rank]=max('Date'[Year Rank]) && 'Date'[Day of Year] <= Max('Date'[Day of Year]) ))
LYTD = CALCULATE(sum('Table'[Qty]), FILTER(ALL('Date'),'Date'[Year Rank]=max('Date'[Year Rank])-1 && 'Date'[Day of Year] <= Max('Date'[Day of Year])))

Time Intelligence, DATESMTD, DATESQTD, DATESYTD, Week On Week, Week Till Date, Custom Period on Period,
Custom Period till date: https://youtu.be/aU2aKbnHuWs&t=145s

DAX Calendar - Standard Calendar, Non-Standard Calendar, 4-4-4 Calendar
https://www.youtube.com/watch?v=IsfCMzjKTQ0&t=145s