This report delivers a comprehensive deep-dive into daylight saving time (DST) through four diverse sources. The aim is to extract core timing data, reliability signals, and policy-context insights that collectively illuminate when and how clocks change, and what this implies for public policy, scheduling, and information accuracy. Across the four references, a consistent pattern emerges: official, time-change rules are well-documented; discrepinces in exact dates or regional practice can arise from jurisdictional nuance, regional exemptions, or page content quality. The strongest, most actionable data come from Timeanddate (reference 3) for concrete start/end times in the United States; Wikipedia (reference 4) provides broad context and global usage patterns; the USNO/Navy .gov page (reference 1) anchors the legitimacy and security of official guidance; IndyStar (reference 2) offers a real-world DST-end narrative for 2025, albeit with content quality issues in the excerpt. Together, these sources support a robust understanding of “what time does the time change” in the U.S. in 2025 and provide a framework for interpreting DST information from government, media, and reference sites.
Scope and Methodology
– Scope: Analysis focuses on four sources that address Daylight Saving Time (DST) in general, and the U.S. DST schedule for 2025 specifically where data permits.
– Methodology: Qualitative synthesis of the timing data, reliability indicators (official vs. media vs. crowd-sourced), and geographic scope. Where sources disagree or present caveats, the report notes jurisdictional nuance and data quality considerations.
– Limitations: Some sources (notably 참조2) include extraneous content or formatting oddities; such content requires cautious interpretation. Official timing data is most reliably sourced from Timeanddate (reference 3) and corroborated by Wikipedia (reference 4) for global patterns, while 참조1 anchors the policy-reliant, governmental framing of DST.
Findings by Source
참조1 — Daylight Saving Time (USNO/Navy)
Key points extracted:
– Reliability and authority: The page emphasizes official government affiliation and secure access, signaling authoritative DST context. The main emphasis in the accessible excerpt is about government site credibility and secure connection rather than explicit time-change timings.
– Implications for timing data: As a government FAQ, this source underpins the legitimacy of DST concepts and the general practice of updating time to reflect daylight utilization, but it does not supply precise clock-change dates or hours within the excerpt.
– Practical takeaway: For policy readers, 참조1 reinforces that DST is governed by federal guidance and that official channels provide authoritative definitions and notices; it should be cross-checked with event-specific pages (e.g., Timeanddate) for actual dates and times.
참조2 — When does daylight saving time end in 2025? (IndyStar)
Key points extracted:
– Core claim: The article discusses the end of DST in 2025, with the conventional “Fall Back” one-hour backward shift at the end of DST, commonly on November 2, 2025, in the United States context.
– Content quality caveat: The excerpt contains heavily promotional or unrelated content (ads and garbled blocks of text), which distracts from a clean journalistic DST timetable. This reduces reliability for precise datestamps unless corroborated by other sources.
– Practical takeaway: The reference highlights an expected 2025 end-date and the familiar one-hour rollback narrative, illustrating how media coverage commonly frames DST change as a public-facing, time-critical event. However, readers should rely on Timeanddate (reference 3) for exact times and on official notices for confirmation.
참조3 — Daylight Saving Time 2025 in the United States (Timeanddate)
Key points extracted:
– Exact timing: Start of DST in 2025 (United States) occurs on Sunday, March 9, 2025, at 02:00 local time, when clocks move forward one hour to 03:00 (Spring Forward).
– End of DST in 2025: On Sunday, November 2, 2025, at 02:00 local daylight time, clocks are turned backward one hour to 01:00 local standard time (Fall Back).
– Next change: The site notes the next scheduled change after 2025 is March 8, 2026, at 02:00 (start of DST in 2026).
– Geographic nuance: The page references multiple regional notes, including states and territories with DST practice, and public discourse (e.g., “Texas Moves Toward Permanent DST”) that indicate ongoing policy discussions and regional variants.
– Reliability: Timeanddate is a widely cited reference for DST timing, offering precise timestamps and a clear timetable that users can depend on for planning, scheduling, and software development.
참조4 — Daylight saving time — Wikipedia
Key points extracted:
– Global context: DST is used by roughly one-third of the world’s countries as of 2023; usage is regionally variable, with several countries observing DST only in some areas.
– United States specifics: In the U.S., most states observe DST, with notable exceptions (Hawaii, and most of Arizona), while the Navajo Nation within Arizona does observe DST.
– Naming and mnemonics: DST is referred to by several terms, including daylight saving time, daylight time (U.S. and Canada), and summer time (UK, European Union, others), with the common mnemonic “spring forward” and “fall back.”
– Practical takeaway: Wikipedia provides a broad, comparative backdrop to DST practices and terminology, useful for cross-country context and historical evolution, though not a primary scheduling authority for a given year or locale.
Cross-Source Synthesis and Key Insights
– Timelines and hours: The most precise, date-and-time data for the U.S. 2025 DST schedule comes from Timeanddate (reference 3). The start is March 9, 2025, at 02:00, moving to 03:00; the end is November 2, 2025, at 02:00, moving back to 01:00. This double-checked timing is critical for software, transportation, broadcast, and scheduling industries that rely on automated time changes.
– Jurisdictional nuance: Wikipedia (reference 4) and Timeanddate (reference 3) both underscore that DST is not uniformly observed across all U.S. jurisdictions; Hawaii and most of Arizona do not observe DST, although Navajo Nation within Arizona does. This nuance is essential for any national or cross-border planning that depends on time standards.
– Official credibility and policy framing: 참조1 reinforces that DST information often resides in official government channels and that the reliability of such data rests on official, secure sources. For organizations needing authoritative guidance, consult federal or state-level notices beyond general reference pages.
– Public-facing communication and media framing: 참조2 illustrates how DST shifts are communicated in media contexts and how such articles can vary in quality. The presence of extraneous content serves as a cautionary note about the reliability of media pages when used for precise timing, reinforcing the need to cross-check withTimeanddate or official bulletins.
– Global context: 참조4 situates DST within a broader global landscape, highlighting that the practice’s prevalence and regulatory landscape differ by country and region. This context is important for multinational organizations, travelers, and software developers who must account for regional differences.
Implications for Policy, Practice, and Public Understanding
– For policymakers: The convergence of data from Timeanddate and Wikipedia suggests that while the U.S. DST schedule for 2025 is well-defined, regional exemptions remain significant. Policy debates on permanent DST (often discussed in reference to Texas and broader U.S. states) require clear, timely communications to avoid scheduling chaos.
– For businesses and technology: The exact time changes (March 9, 2025, 02:00 -> 03:00; November 2, 2025, 02:00 -> 01:00) are critical for time-zone-aware systems, scheduling, and automation. Official sources should be used as primary data feeds, with cross-checks against Timeanddate for date accuracy and against local jurisdictional rules for exemptions.
– For the public: The mnemonic “spring forward, fall back” remains a salient teaching tool to help individuals adjust devices and calendars. However, public education should emphasize that some regions do not observe DST and that regional variations exist within states.
Limitations and Future Research
– Data quality variations: The IndyStar source (참조2) demonstrates how media pages with ad-laden content may proliferate DST references but require careful verification. Future work should map DST data using a standardized, government-verified feed to minimize ambiguity for the public.
– Regional policy developments: Ongoing and future policy developments around permanent DST or regional exemptions require continuous monitoring. Future research should track state-level bills and political debates (e.g., Texas-related discussions) and how these debates affect practical timekeeping.
– Global comparison: While the U.S. data is the focus, broader comparisons using 참조4 can be expanded to analyze how DST adoption affects commerce, travel, and cross-border scheduling in regions with seasonal time changes.
Conclusions
– What time does the time change in 2025 in the United States? The authoritative schedule, per Timeanddate (reference 3), is: start on March 9, 2025, at 02:00 local time (clocks forward to 03:00); end on November 2, 2025, at 02:00 local daylight time (clocks back to 01:00 standard time). These timings provide a concrete, actionable timetable for planners and technologists.
– The DST framework is underpinned by official guidance (참조1) and is widely contextualized in global compendia (참조4). Yet, jurisdictional exemptions persist (e.g., Hawaii and most of Arizona, with Navajo Nation observing DST) and policy debates about permanent DST remain a live topic in some jurisdictions (referenced in 참조3 and reinforced in 참조4).
– The combination of official policy framing, precise timing data, and global context yields a robust foundation for understanding “what time does the time change” in the U.S. for 2025 and for interpreting DST information across borders. For precise scheduling, reliability is highest when cross-checking Timeanddate with official state or federal notices and corroborating with globally recognized reference sources.
참조
참조1 — Daylight Saving Time. URL: https://aa.usno.navy.mil/faq/daylight_time
참조1 내용 요약: The page emphasizes official government status and secure access, establishing credibility for DST definitions and policy context, though the provided excerpt centers on site legitimacy rather than specific clock-change times.
참조2 — When does daylight saving time end in 2025? When do clocks fall … . URL: https://www.indystar.com/story/news/2025/10/06/did-the-time-change-last-night-when-daylight-saving-time-ends-2025-dst-fall-back-one-hour-when-nov-2/86545134007/
참조2 내용 요약: Core DST-end claim appears to be November 2, 2025, with a fallback of one hour. However, the excerpt contains heavy advertising and content noise, reducing reliability for precise timing without cross-checking with other sources.
참조3 — Daylight Saving Time 2025 in the United States. URL: https://www.timeanddate.com/time/change/usa
참조3 내용 요약: Provides exact DST start/end times for 2025 in the United States (start 9 Mar 2025 02:00 → 03:00; end 2 Nov 2025 02:00 → 01:00), next change in 2026, and notes on regional variations and policy discussions (e.g., permanent DST debates).
참조4 — Daylight saving time – Wikipedia. URL: https://en.wikipedia.org/wiki/Daylight_saving_time
참조4 내용 요약: Global overview; about 34% of countries use DST as of 2023; regional variations and terminology (DST, daylight time, summer time); U.S. specifics (Hawaii and most of Arizona do not observe DST, Navajo Nation does); mnemonic and regional differences.
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