Definition · temporal data
Assertion time
Assertion time is a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction time. For assertion time, a useful definition states a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction, who owns it, and which decision it supports.
Also known as decision time, knowledge time, belief time
Why it matters
Understanding assertion time matters because leaders need a shared, source-backed meaning before they can compare results, explain performance, or decide what to do next. Where valid and transaction time cover what was true and when it was recorded, assertion time captures when the business decided to believe it—useful for tracking when an assumption or definition was adopted, separate from when the data arrived.
In practice
Operating example
Assertion time is useful when teams need a shared interpretation of a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction time. The definition should make source data, timing, ownership, and the decision it supports explicit.
Pluvo example
Where valid and transaction time cover what was true and when it was recorded, assertion time captures when the business decided to believe it—useful for tracking when an assumption or definition was adopted, separate from when the data arrived.
In practice, teams should define assertion time with a clear source, owner, time period, and decision before they use it in reporting, planning, or operating reviews.
Understanding assertion time matters because leaders need a shared, source-backed meaning before they can compare results, explain performance, or decide what to do next. Where valid and transaction time cover what was true and when it was recorded, assertion time captures when the business decided to believe it—useful for tracking when an assumption or definition was adopted, separate from when the data arrived.
A strong workflow for assertion time separates the definition from the action: first agree what the term means, then decide how it is measured, when it changes, and who is accountable for the next step.
Where valid and transaction time cover what was true and when it was recorded, assertion time captures when the business decided to believe it—useful for tracking when an assumption or definition was adopted, separate from when the data arrived.
FAQ
What is assertion time in temporal data?
Assertion time is a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction time. For assertion time, a useful definition states a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction, who owns it, and which decision it supports.
Is assertion time the same as decision time?
Teams use assertion time when they agree on the source data, time period, owner, and decision it supports. Here, it covers a proposed third temporal dimension recording when a fact was asserted or believed, distinct from valid and transaction time, so the term should be reviewed before it is used in reporting, planning, or operating decisions.