Methodology
Every date on Dayvessa is assigned one of five verification statuses behind the scenes. We only publish dates when their source, scope, and verification status are clear enough to present responsibly.
– Verified — confirmed against an official source and considered current and reliable for publication.
– Provisional — published by an official authority but explicitly still subject to change. This is most common with school terms or future calendar information released several years in advance. Provisional dates are clearly labelled on the relevant page rather than presented as final.
– Pending — data exists but has not yet completed Dayvessa’s verification and publication process.
– Unavailable — the relevant authority has not yet published the information, or the information cannot currently be confirmed from an authoritative source.
– Archived — historical data retained for reference and no longer treated as current.
We never invent, estimate, or extrapolate a date simply to fill a gap.
If an authority has not yet published a future public holiday, regional closure, school term, or other calendar date, Dayvessa will say that the information is not yet available rather than guess.
Where dates come from
Dayvessa follows a clear source hierarchy.
For school terms and school holidays, we prioritise official state and territory education departments.
For public holidays, we prioritise official state and territory government websites, gazettes, and the relevant public-holiday authorities.
We also use Fair Work Ombudsman and Australian Government sources where they are relevant to national rules or cross-checking.
Official calendars, government PDFs, legislation, and other authoritative publications may also be used when appropriate.
Reputable secondary sources may occasionally be used for cross-checking, but never as the primary source when an official source is available.
The source behind each Dayvessa dataset is recorded and traceable. You can see an overview of the authorities we rely on on our Sources page.
How we handle regional, sector-specific and part-day holidays
Not every public holiday applies to an entire state or territory.
Some dates apply only to a particular region, municipality, industry, sector, or part of a day. Dayvessa records these distinctions separately so that a local or sector-specific holiday is not presented as a statewide day off.
Where a holiday is part-day only, we keep the relevant time information rather than treating it as a full-day public holiday.
These distinctions are also taken into account by Dayvessa’s planning tools, including the Business Days Calculator, Long Weekends pages, Calendar, and Annual Leave Optimiser.
How corrections happen
Every change to calendar data on Dayvessa is logged.
When a verified dataset needs to be corrected, it does not simply remain marked as verified. The affected dataset is moved back into review, the correction is checked against its source, the data is audited again, and only then can it return to verified status.
This means a correction follows the same controlled process as newly imported data rather than being silently edited in place.
Dayvessa does not currently offer a public “report an issue” form. If you notice a date that appears incorrect, the relevant official government source should always be treated as authoritative while the Dayvessa data is reviewed.
Our principle
If Dayvessa and an official government source ever disagree, the official government source takes precedence.
Our goal is not to replace official information, but to make verified dates easier to understand, compare, and use for practical planning.