There is no standard/default functionality in JIRA to create JQL that shows you all issues with links.
To my knowledge, the closest you can get are the solutions mentioned in the accepted answer to this question (even four years later, those options are still valid). If you're on Cloud, the only option would be ScriptRunner's Enhanced Search.
Even then, it's not really possible to create JQL that says "show me issues that I linked together after this specific date." With the options above, you can search to see all issues that have links, but you can't specify the date they were linked.
Since that's the case, I would try out some of those add-on options. Like I said, I don't know that any of those options can get you exactly what you need, but those are the closest options that I know of. Otherwise, you'd probably need some custom coding, create your own add-on/report, etc.
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