I found the solution by myself
=TEXT(DATEFIELDNAME;"mmmm")
SharePoint online needs ; instead ,
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Hello,
I need a calculated filed that show extended month from another date field.
When I put the formula in SPO, I get the error :
Sorry, something went wrong
The formula contains a syntax error or is not supported.
Formula; =TEXT(DATEFIELDNAME,"mmmm")
THANK YOU
I found the solution by myself
=TEXT(DATEFIELDNAME;"mmmm")
SharePoint online needs ; instead ,