早日 (zǎo rì) is a formal, written adverb meaning 'soon, at an early date', used in wishes or plans (e.g., 早日康复 'speedy recovery'). It differs from 快 (kuài), which is more colloquial and general for 'soon'; and from 即将 (jí jiāng), which means 'about to' and implies immediate near-future. As a noun, 早日 means 'early days' (past), contrasting with 早期 (zǎo qī) 'early stage'.