Conditional column valid to specific period of time

[MKPartner]

Hello, 

I need some help. I have below conditional colum. 

= Table.AddColumn(#"Rozwinięty element QR7", "QR7.shift.SQL", each if [QR7.shift] = "A" then "C" else if [QR7.shift] = "B" then "A" else if [QR7.shift] = "C" then "B" else [QR7.shift])

This code is valid for only until Year = 2023, Month = P03 & Week = WK09. Since Week 10 above code was fixed on SQL server. I don't need this anymore for further data but I need this code for past data.

Can you help me how to tweak his code to be valid only until week 09 2023 ? 

Thank you 

[wdx223_Daniel]

= Table.AddColumn(#"Rozwinięty element QR7", "QR7.shift.SQL", each if[Year]>=2023 and [Week]>="WK 09" then QR7.shift] else if [QR7.shift] = "A" then "C" else if [QR7.shift] = "B" then "A" else if [QR7.shift] = "C" then "B" else [QR7.shift])

[MKPartner · Accepted solution]

Again thanks for feedback. I have modified you code to below & it solved my issue: 

= Table.AddColumn(#"Rozwinięty element QR7", "QR7.shift.SQL", each if[WC_Date]>"2023P03WK09" then [QR7.shift] else if [QR7.shift] = "A" then "C" else if [QR7.shift] = "B" then "A" else if [QR7.shift] = "C" then "B" else [QR7.shift])

[MKPartner]

Thanks for feedack. I have copied & pasted your code & I have below error: