I'm not sure what year, but how the sword progression went:
Straight blades, then when horses were introduced, the warriors (samurai didn't exist as yet) who used horses wore the Tachi (an overly curved sword designed to be able to draw from a seated horseback position, and wore blade down).
Then when the samurai came about and swords were used more in duels of honor/street fights rather than full scale wars, the blades became a little straighter and that is what the katana is called. The katana became straighter, little shorter (because it didn't have to be so curved), and was worn blade up; in accordance with what we know today as their katana is their soul. I do not believe this mindset existed before the samurai. Atleast not as we know it. Ofcourse a warrior would value their sword.....to lose their sword/weapon meant they probably lost their life too.
Search Nobunaga Oda and Warring States period in japan for better dates. Tokugawa Shogunate was from 16??-1887? That's when the Samurai solidified they new status. After 1887?, that was the Meiji Restoration and the wearing of swords in public was outlawed. *to help get rid of the samurai*
As for your question.....are you asking when the first katana was made, or the first japanese sword? Because as I have stated, the katana were not the first japanese swords.