If you’re asking “when does daylight savings time start?” or “when does daylight savings end?”, here are the key 2025 dates, states opting out, and the latest on whether daylight savings time will end permanently. We also explain how DST can impact your sleep, energy use, and even your budget.
Most U.S. states “spring forward” and “fall back.” Arizona (except Navajo Nation) and Hawaii do not observe daylight saving time.
Several states have passed legislation to adopt permanent daylight saving or standard time, pending federal approval. We summarize the latest policy status and proposals.
Federal efforts like the Sunshine Protection Act have sought permanent DST nationwide. We outline the pros and cons, health and energy research, and what would need to change.