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This article delves into precise methods for converting NSTimeInterval (time intervals) to hours, minutes, seconds, and milliseconds in Swift programming. By analyzing common error cases, it explains how to correctly extract the millisecond component and provides solutions based on floating-point remainder calculations. The article also introduces extension implementations in Swift 4, demonstrating how to encapsulate functionality for better code reusability. Additionally, it compares the pros and cons of different approaches, helping developers choose suitable methods based on practical needs.