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There is no universal daylight-saving rule for payment settlement batches. A batch scheduled by a region’s local business clock may shift in UTC when that region changes its clocks; one scheduled at a fixed UTC time will keep the same instant and appear at a different local hour. The provider’s cutoff rules determine what actually happens—and a cutoff, transmission, processing, settlement, and payout are not necessarily the same event.
Why daylight saving time can change a batch schedule
Daylight saving time changes the offset between a region’s civil clock and UTC. That creates two different ways to schedule a recurring batch:
- Local-wall-clock schedule: “Run every day at 2:00 a.m. in this market.” The intended local hour stays the same, but its corresponding UTC time changes when the region changes offset.
- UTC schedule: “Run at 07:00 UTC every day.” The instant stays fixed, but the batch appears at a different local hour after an offset change.
A named region such as America/New_York carries that region’s civil-time rules. A fixed offset such as UTC−5 does not: it cannot express when a region switches to another offset. The IANA time-zone database records regional histories and predicted future rules, which can change over time. See the IANA time-zone database theory and data documentation and RFC 3339’s timestamp guidance.
What happens to a local time that skips or repeats?
Spring forward: a local time may not exist
When clocks move forward, a range of local times is skipped. In New York on March 11, 2018, 2:30 a.m. did not occur. PostgreSQL’s documented behavior interprets that input using the pre-transition standard-time offset, then displays it as 3:30 a.m. after conversion. Another system may reject or normalize the input differently; that PostgreSQL example is an implementation rule, not a universal payment-processing policy.
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Fall back: a local time may occur twice
When clocks move back, a range of times repeats. New York’s 1:30 a.m. on November 4, 2018, occurred twice, corresponding to two different instants. PostgreSQL defaults to the standard-time interpretation in its example; an explicit daylight-time designation selects the other instant. A system that receives only “1:30 a.m.” without a region and offset cannot tell which occurrence was intended.
These examples come from the PostgreSQL documentation on invalid and ambiguous timestamps. The page is for PostgreSQL 12; its behavior should not be assumed to describe every processor, database, or scheduling system. RFC 3339 explains why an unqualified local timestamp is problematic for interoperability: “Unqualified local time zone will fail in approximately 23/24 of the globe.”
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Do not treat a cutoff as the settlement time
Payment operations can involve several separate moments: a transaction cutoff, batch transmission, provider processing, settlement, and funds arriving in an account. A provider’s use of “cutoff” does not by itself establish when funds will settle or become available. For example, Authorize.net describes automatic batching after its transaction cutoff, while SAP describes when held payment batches are transmitted and says projected settlement depends on provider processing.
| Provider or service | What its documentation says | Scope to keep in mind |
|---|---|---|
| Authorize.net | Captured transactions are automatically batched every 24 hours immediately after the Transaction Cut-Off Time; its default cutoff is 4:00 p.m. Pacific Time. | The cited support article covers Merchant Interface versions 1.0 and 2.0. The default should not be taken to mean every account has the same setting. Authorize.net Support, article 000001244, last modified September 29, 2026. |
| NAB Connect | Cutoffs are based on Melbourne and Sydney local time (AEDT/AEST) and change with those zones. | For certain listed services, NAB says that from Monday, October 5, 2026, cutoffs are one hour earlier for customers in the Northern Territory, Queensland, and Western Australia. This is a service- and jurisdiction-specific example. NAB Connect daylight-saving and public-holiday guidance. |
| Federal Reserve FedACH | The schedule distinguishes transmission deadlines, target distribution, and settlement schedule. Listed same-day-eligible items have current-day settlement windows at 1:00 p.m., 5:00 p.m., and 6:00 p.m. Eastern Time. | The schedule is stated to be effective September 12, 2022; confirm the current schedule before relying on it operationally. FedACH Processing Schedule. |
| Federal Reserve Fedwire Funds Service and National Settlement Service | Official operating schedules use Eastern Time and include windows that open on the preceding calendar day. | A window’s opening calendar date and the service’s business date may differ. Operating hours. |
| SAP Business Network | Held batches are sent after the daily cutoff. Batches submitted after cutoff may transmit after the following day’s cutoff; projected settlement depends on transmission date and payment-provider processing time. | Guide version 2605 applies to customers who have not migrated to the SAP BTP experience. SAP Payment Batch Transmission Rules. |
| Oracle NetSuite | Its documentation lists cutoffs in Eastern Time; ACH or check payments submitted and authorized after cutoff are processed at 5:00 a.m. the next business day. | The documentation describes NetSuite’s processing rules, not a universal bank settlement time. Oracle Payment Batch Cut-Off Times Overview. |
How to verify your own batch schedule
- Identify the event you are checking. Look for whether the published time refers to transaction cutoff, batch submission, transmission, processing, settlement, or payout. Do not infer one event’s time from another.
- Confirm the account, product, and documentation version. Check whether the provider’s rule applies to your account configuration, payment rail, product edition, and current interface or guide version.
- Write down the time zone precisely. Prefer a named region and the relevant date over an unqualified label such as “Eastern” or a fixed offset. If a timestamp is being passed between systems, include its offset, as RFC 3339 recommends.
- Check upcoming transition dates and local holidays. Regional clock rules and bank calendars can affect different services in different ways. Verify the provider’s current schedule for the jurisdiction and service you use.
- Test both ambiguous-time cases if you control the scheduler. Confirm what happens when a scheduled local time falls inside the spring gap and when it occurs twice in autumn. Record whether the software rejects the time, shifts it, or selects one of the two offsets.
- Confirm completion using the provider’s event record. Use the batch, transmission, processing, or settlement status that corresponds to the outcome you need; a scheduled cutoff alone does not confirm settlement or fund availability.
There is no industry-wide DST settlement-failure rate established by the cited sources. Their times are operating examples, not evidence of how often daylight-saving changes cause failures.
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