The main purpose of this legislation is to make standard time permanent across the United States, while allowing individual states the option to continue observing daylight saving time if they choose. This change aims to eliminate the biannual clock changes that occur when daylight saving time begins and ends, which many people find disruptive. Key provisions of the law include the repeal of the existing daylight saving time regulations and the establishment of a framework for states to opt into daylight saving time if they wish.