If you care about your WordPress sites SEO do NOT use the Archive Widgets (Calendar and Archives) or any theme/plugin custom Archive widgets.
If you currently have Dated Archive widgets on a sidebar go to “Appearance” > “Widgets”, find the relevant archive widgets and remove them.
While you are editing your widgets, seriously consider removing the Meta Widget as well, it’s a waste of link benefit to link to your WordPress Login Page: see Alternative Ways to Login to WordPress.
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