Badge on Category

Hello,

I need to display the badge if product belongs to a certain category and changing the published day doesn’t work for me.

I’m trying to replace
if ( ( time() – ( 60 * 60 * 24 * $newness ) ) < $postdatestamp )
with
if ( is_category(‘category name’) )

but it doesn’t work. Can you please help?

https://www.ads-software.com/plugins/woocommerce-new-product-badge/