Xú Zhěng 徐整 (fl. mid-3rd century), zì Wéncāo 文操, a SūnWú 孫吳 court historian and chronologist. Native of Yùzhāng 豫章. His exact lifedates are not preserved; he is conventionally dated to the reign of Sūn Quán 孫權 (r. 222–252). The Suí shū jīngjí zhì lists three works under his name: Sānwǔ lìjì 三五歷紀 in 2 juàn, Chánglì 長曆 (also Xú Zhěng chánglì) in 1 juàn, and a separate Wǔyùn lìnián jì 五運歷年紀. All three are lost as freestanding texts but survive in extensive fragments preserved in the Táng–Sòng leishu, especially Tàipíng yùlǎn 太平御覽 and Lǐ Fǎng’s Tàipíng guǎngjì 太平廣記.
He is principally remembered as the earliest preserved source for the Pángǔ 盤古 creation myth: the celebrated account in which Heaven and Earth in primordial chaos resemble a chicken’s egg, with Pángǔ growing inside for eighteen thousand years until the pure-and-light (yáng 陽) rises to form the sky and the impure-and-heavy (yīn 陰) settles to form the earth — every day the sky rising by one zhàng 丈, the earth thickening by one zhàng, and Pángǔ himself growing one zhàng taller — first appears in his Sānwǔ lìjì. The cosmogony is not attested in any pre-Hàn text and likely entered the Chinese mythological repertoire through Indian-Buddhist contact in the early Three Kingdoms period; Xú Zhěng’s Yáng-zhōu-region southern-Wú milieu, with its early-Buddhist circulation, is a plausible vector. The Chánglì (KR3f0060 in the Kanripo corpus) is a related cosmographic-and-chronological compilation extending the cosmogonic narrative into the chronology of the Three Sovereigns (三皇) and Five Emperors (五帝).
He has no CBDB id (CBDB coverage of Three Kingdoms scholars is patchy; the entries 30390 and 309921 for 徐整 in the current dump are a Southern Liang and a Ming homonym respectively, neither matching our Wú-period figure).