The article explores calendar anomalies in the Malaysian stock market, focusing on patterns before, during, and after the Asian financial crisis. It finds evidence of negative Monday returns post-crisis but no January effect or monthly seasonality. This suggests long-term investors could benefit from a buy-and-hold strategy, while short-term investors may find opportunities in misaligned prices due to varying market volatility. Understanding the day-of-the-week effect can help investors manage risk. The study also questions previous research that assumed symmetrical market reactions, highlighting the importance of considering asymmetrical reactions in analyzing calendar anomalies.