Remove date filter context and apply another one

Hi PBICommunity 

I have a problem that i can't solve.

To illustrate the example, my model is composed of:

- a fact table : sales, dates, countries

- 2 dim tables : dates, countries

Dates from sales tables start at 1/1/2020

In the dataviz, I highlight sales amount and by country, using different timeframes (YTD, YoY, alltime...)  using DAX queries 

ex : SalesYTD = CALCULATE([sales] , DATESYTD( Dates[Date] ) )

So, alltime sales amount for every country are based on all dates, starting 1/1/2020

SalesAlltime = CALCULATE([sales] , ALL( Dates[Date] )

However, a single country needs to compute its sales from 1/1/2021, isolating existing sales prior to 1/1/2021.

The problem is when I calculate all time sales for a country , it take all dates row from date table.

How can I compute this "all function" for this specific country (all must return dates from 1/1/2021 to date only) ?

How could I use a date filter that would fit with all countries, including this specific country ?

Thank you !

Greg