How to pass a data type to google sheet?

[calcioscacchi]

That's not the problem, i'm afraid moment node will return always a string.

But i solve with the other idea: get the number of the week frm the date. I set the moment node to return date in WW format, then i change the string into a number looking at this discussion

String to number

The Node-RED Function node uses JavaScript. A quick google search for how to do that will reveal lots of answers, for example: Nick