Britain did not convert to the Gregorian calendar until 1751, when 11 days had to be added to their dates to get the Gregorian dates. In 1639 they were 10 days behind the Gregorian calendar.
Re: Klein Tools Or Greenlee. Both Klein and Greenlee are TOP quality tools with a niche market. They have a few common tools (such as rabis and ratchet cutters) and either is worth buying over pretty much anything else. They are not really direct competitors. I prefer Knipex for most hand tools except linemans.
I work for Stanley Mechanics Tools, specifically with the Proto Industrial brand. I personally do not think that MAC, MatCo, or Snap-On branded tools are worth the extra markup since they use the same forgings and manufacturing processes that make Husky and Kobalt and pre-1994 Craftsman.