The "Brahmanda Purana" is one of the oldest Puranas. Estimates for the composition of its earliest core vary widely. The early 20th-century Indian scholar Dikshitar dated the Brahmanda to 4th-century BCE. Most later scholarship places this text to be from centuries later, in the 4th- to 6th-century BCE. The text is generally assumed, states Ludo Rocher, to have achieved its current structure about 1000 CE.