Are there tools out there to determine when a link linked to your site? I want to know when a link farm was done a site.

[StrategicEdgePartners]

In Webmaster Tools I discovered that a client of mine with signed up for or hired another company to get links.  The links are poor quality and from other countries, so it looks like a link farm was done.  I want to know when they links were linked to the site, and not sure how to find that information out.  Does anyone know how to find this out?

[EppieVojt]

Ahrefs and Majestic SEO both track historical link acquisition, though the reliability of this information isn't the greatest given that they're reporting when they found the link, not when it was actually created.  Obviously, Google has more resources to crawl the web and would find the link sooner than these services would.  Despite this problem, it should still be enough to give you a rough feel for when a large chunk of links were created.

[EppieVojt]

Ahrefs and Majestic SEO both track historical link acquisition, though the reliability of this information isn't the greatest given that they're reporting when they found the link, not when it was actually created.  Obviously, Google has more resources to crawl the web and would find the link sooner than these services would.  Despite this problem, it should still be enough to give you a rough feel for when a large chunk of links were created.

[firstconversion]

If you know the sites in question, look in your analytics refferal data for any traffic from them.