I have a precise date for the earliest Xinjing (T 251), an inscription with a colophon dated 13 March 661.
I know the earliest literary reference to the Damingzhoujing is in the Kaiyuan Catalogue, dated 730. But when is the first dated physical evidence of the Damingzhoujing?
I need to be able to cite this, so please supply a reliable source and no speculations.