1st ever ODI hat-trick was taken on Sept 20, 1982
One Day International cricket's first ever hat-trick was taken by Pakistan's Jalal-ud-Din against Australia on September 20, 1982. Jalal-ud-Din dismissed Rod Marsh, Bruce Yardley and Geoff Lawson with the last three balls of his seventh over. Jalal-ud-Din's feat helped Pakistan win the match by 59 runs after restricting Australia to 170 for 9.