The Sunshine Protection Act of 2025 would lock the country into year‑round daylight saving time by changing the underlying federal statutes that define standard time. The bill rewrites time offsets in the Calder Act and alters the Uniform Time Act framework so that the U.S. no longer moves clocks twice a year.
That shift matters for anyone who builds schedules, runs time‑sensitive systems, or manages cross‑border operations: airlines, railroads, utilities, payroll and benefits systems, software platforms, and state regulators will need to reconcile new statutory time definitions with existing contracts, state laws, and international timekeeping. The law also gives states that previously exempted themselves an explicit choice about which statutory standard time to retain, creating the potential for a patchwork of local rules.
At a Glance
What It Does
The bill amends federal time statutes: it repeals the temporary-period provision in the Uniform Time Act, and it amends the Calder Act’s statutory hour offsets so that federal ‘standard time’ moves forward by one hour (effectively making current daylight saving time the new baseline). It also inserts a special rule letting states that had previously exempted themselves choose between the new federal baseline and the prior standard time for their jurisdictions.
Who It Affects
The change directly affects any entity that depends on federal statutory definitions of time: transportation carriers, telecommunications and cloud providers, financial markets, federal and state scheduling systems, and employers with multi‑state operations. States and territories that had opted out of DST are affected because the bill gives them an explicit method to preserve their prior clock settings.
Why It Matters
By altering statutory definitions rather than creating a temporary rule, the bill shifts the legal baseline for time across statutes and regulations. That creates immediate compliance work (code updates, contract review, regulatory filings) and raises coordination issues for interstate commerce and international scheduling where fixed UTC offsets are assumed.
More articles like this one.
A weekly email with all the latest developments on this topic.
What This Bill Actually Does
Legally, the bill does two things to make year‑round daylight saving time the default. First, it removes the statutory provision that treated daylight saving time as a temporary, seasonal regime; second, it changes the hour‑offset language in the 1918 Calder Act so that the federal ‘‘standard time’’ printed in statute advances by one hour.
Those textual edits mean that what Americans currently call daylight saving time becomes the new statutory baseline, unless a state otherwise opts out under the new language.
The bill’s drafting is surgical: it replaces specific hour values in the Calder Act table (for example, changing a listed ‘‘4 hours’’ offset to ‘‘3 hours’’ and so on) so every listed offset is shifted one hour forward. That approach avoids creating a separate new time zone label; instead, it redefines the existing statutory offsets to produce the same clock reading as today’s DST, but as ‘‘standard’’ time in the statute.For states that previously used the Uniform Time Act’s exemption to remain on standard time year‑round, the bill inserts a new subsection giving those states an express choice: they may adopt the rewritten Calder Act offsets (the new federal baseline) or retain the offsets that applied immediately before the bill’s enactment.
Practically, that means some states could keep permanent standard time while neighboring states switch to permanent DST, producing adjacent jurisdictions with different clock settings.The bill contains no separate enforcement mechanism, funding, or phase‑in schedule. Implementation therefore falls to existing federal agencies and to private actors who must update systems and contracts to reflect the new statutory baseline.
That practical vacuum is where most immediate costs and legal questions will emerge — from software vendors rewriting scheduled tasks to regulators updating guidance for time‑stamped records.
The Five Things You Need to Know
Section 2(a) repeals Section 3 of the Uniform Time Act of 1966 (15 U.S.C. 260a), removing the statute’s treatment of daylight saving time as a temporary seasonal period.
Section 2(b)(1) amends the 1918 Calder Act (15 U.S.C. 261) by substituting each listed hour offset with the next lower hour value (each statutory offset advances by one hour).
Section 2(b)(2) adds a new subsection allowing states or areas that had previously exempted themselves under the Uniform Time Act to choose either the rewritten Calder Act offsets or the offsets that applied the day before enactment.
The bill redesignates the existing subsection (b) of the Calder Act as subsection (c) and makes a conforming amendment to the Act’s second‑sentence phrasing to reflect the new state‑choice provision.
The text does not include an effective date, implementation timetable, funding for federal action, or express enforcement provisions — responsibility for operational changes falls to existing agencies, states, and private parties.
Section-by-Section Breakdown
Every bill we cover gets an analysis of its key sections.
Short title
Gives the Act its public name, the ‘‘Sunshine Protection Act of 2025.’' That label signals intent but carries no legal force — the operative changes appear in Section 2.
Repeal of the Uniform Time Act’s seasonal framework
This clause removes Section 3 of the Uniform Time Act, the statutory provision that currently governs when daylight saving time begins and ends each year. Repealing that provision eliminates the statutory mechanism that treated DST as a temporary adjustment rather than a permanent baseline — a prerequisite step for making DST the default in federal law.
Advancing the Calder Act offsets by one hour
The bill edits the Calder Act’s hour‑offset wording by systematically replacing each listed offset with the next lower number (for example, changing ‘‘4 hours’’ to ‘‘3 hours’’), which produces a one‑hour advance in statutory time across the listed zones. Because the drafters edited numerical offsets rather than creating new zone names, the result is that current DST clock readings become the statutory ‘‘standard time’’ in the federal code.
State exemption and choice for prior opt‑outs
Congress inserts a new subsection that explicitly permits States (or parts of States) that had previously exempted themselves under the Uniform Time Act to decide which statutory ‘‘standard time’’ to retain: either the newly rewritten Calder Act offset or the offset that applied the day before enactment. That preserves an opt‑out path for those jurisdictions but also institutionalizes the possibility of neighboring regions observing different permanent times.
Conforming and housekeeping edits
The bill redesignates an existing subsection and tweaks a sentence in the Calder Act to align with the new exemption text. These are mechanical changes intended to avoid internal contradictions in the statute once the main edits take effect.
This bill is one of many.
Codify tracks hundreds of bills on Government across all five countries.
Explore Government in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Retailers, restaurants, and evening entertainment operators — more evening daylight typically increases foot traffic and extends leisure‑hour commercial activity, which can raise revenues without changing operating hours.
- Outdoor recreation and tourism businesses — consistent additional evening light boosts value for parks, tours, and outdoor venues that schedule activities after work hours.
- Some transportation and logistics operators — stable, year‑round evening light can simplify evening operations and reduce seasonal schedule churn for local delivery and commuter services, lowering the administrative cost of twice‑annual schedule shifts.
Who Bears the Cost
- Airlines, railroads, and intercity carriers — carriers must reconcile timetables with foreign partners and face reprogramming costs for schedule systems and regulatory filings tied to statutory time definitions.
- Software vendors, cloud platforms, and firms operating scheduled processes — cron jobs, backups, financial settlements, and time‑stamp logic will require code changes and testing; failure to do so risks data corruption and transaction errors.
- State and local governments that must revise statutes and administrative rules — jurisdictions that choose differently from neighbors will face compliance, public‑information, and enforcement costs; agencies also shoulder unfunded workload for guidance and updates.
- Healthcare providers and school systems — earlier morning darkness (in many places) has implications for commutes, school start times, and circadian health that may translate into operational changes and stakeholder pushback.
Key Issues
The Core Tension
The bill resolves the practical problem of biannual clock changes in favor of more evening daylight, but in doing so it forces a trade‑off between economic and social benefits tied to evening hours and public‑health, safety, and interstate‑coordination costs that arise when the legal time baseline is altered without uniform political agreement.
The bill solves the policy question ‘‘make DST permanent’’ by altering statutory definitions rather than creating a parallel regime. That approach minimizes new labels but creates practical friction: shifting the legal baseline affects any statute, contract, or regulation that cites federal ‘‘standard time’’ or uses the current offsets.
Because the statute offers no implementation timetable, the immediate burden falls unevenly on private actors and state agencies to update systems and notice affected parties.
The state‑choice clause reduces legal friction for jurisdictions that already opted out, but it also institutionalizes a patchwork risk. Adjacent counties or states with different clock readings complicate traffic safety, school scheduling, and commerce.
International coordination is another gap: many cross‑border agreements and aviation slotting are negotiated against UTC offsets; a unilateral move to year‑round DST changes those assumptions without international harmonization. Finally, public‑health research on permanent DST versus permanent standard time is contested; Congress is deferring that trade‑off to statutory redefinition rather than addressing potential safety and circadian impacts directly.
Try it yourself.
Ask a question in plain English, or pick a topic below. Results in seconds.