June 25 (Reuters) - The S&P 500 hit all-time high at the open on Friday following robust earnings forecast from Nike, while weaker-than-expected inflation data eased worries about monetary policy tightening in the near term. The S&P 500 (.SPX) opened higher by 7.96 points, or 0.19%, at 4,274.45, while the Nasdaq Composite (.IXIC) gained 31.10 points, or 0.22%, to 14,400.81 at the opening bell. The Dow Jones Industrial Average (.DJI) rose 131.28 points, or 0.38%, at the open to 34,328.10. (Corrects to remove reference to Nasdaq hitting a record high in headline and paragraph 1) Reporting by Medha Singh in Bengaluru; Editing by Maju Samuel Our Standards: The Thomson Reuters Trust Principles.