Hi @Pauline Wasselin 

Translated to English:

Need to display week number

Hello community,

I would like to convert a date into a week number...

Do you have a solution ?

Hi @Pauline Wasselin 

Translating a date to a week can depend on how you determine the weeks. (e.g. which day of the week a week starts on and when at the start of a year a week starts)

Often that requires a Code step: https://zapier.com/apps/code/help

Options for using Formatter > Date & Time > Format

https://help.zapier.com/hc/en-us/articles/8496257974029-Modify-date-and-time-formats-in-Zaps#h_01HF6R8YN0MDP5JX7E4ZRPT2QS

Hi Troy

Thanks so much