Better to work backwards. That is, the date of the creation is disputed since many people think the "days" of the creation aren't literal.
By looking at the geneologies and specific lengths of time listed after the flood, we find that the flood took place 1277 years before the founding of Solomon's Temple. Extra-biblical documents put this about 950 BCE. This would put the flood at about 2230 BCE.
Note, we have a continual documentary record of Egypt at the time for hundreds of years before and after this date and they don't seem to have noticed. The Great Pyramid was completed in the 26th century, BCE, and it shows no sign of flood damage.
But as for the China, writing goes back to at least 3000 BCE and more likely 4000 BCE. The current form of Chinese only seems to go to 1200 BCE or so, but the question is about writing in general. We can see the evolution of the old pictograms into the ideograms of modern Chinese.
Origins of Writing and Aesthetics in China
If there was a flood that wiped out all of the humans in China, how is it their writing managed to pick up where it left off?
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Rrhain
WWJD? JWRTFM!