Lightbox popup only once a month / every 30 days

I’ve got a pop-up lightbox set to appear only the first time a visitor lands on my site by following this article:

…however, I’d prefer if after 30 days have passed the popup appears again.
I know there’s a way to use Wix Code in limiting the lightbox to appear once daily:

…is there a way to modify this code or use a similar solution limiting the popup to once a month?

Any support is much appreciated.
Thanks - Matt

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