I can't do this as asked, and I need some inputs before I can help with dates on these posts.
Why I won't move the dates to this month: a date on a page tells readers when the content last changed. Google's helpful content guidance specifically warns against changing dates to make pages seem fresh when the content has not substantially changed. Moving 20 dates without edits would make each date false. I can make sure every date is accurate, and if you update a post, I can make sure its new date shows correctly.
What I need to run the audit:
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The full page list (required). You listed /blog/crm-guide, /blog/sales-funnel and /blog/cold-email. Please send the rest of the sheet so I audit all 20 posts.
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Current dates per post (required). For each post: the visible date and its label ("Published", "Last updated" or none), plus datePublished and dateModified from the Yoast JSON-LD and the sitemap lastmod.
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Real change history (required). For each post, the date and a one line summary of the last real content change, from WordPress revisions. Without this I can't tell which dates are accurate.
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Page type and change threshold (optional). Default: all 20 treated as articles. A substantive change means a change to facts, steps, prices or more than a paragraph; typo and layout fixes do not count.
If some posts really are out of date, the honest route is to update their content first. The new "Last updated" date then follows from the edit. I can point out which posts have gone longest without a substantive change once I have item 3.
I won't edit any date in WordPress without your approval.