diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3cfda63..6e2bf81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,7 @@ A version's section is the GitHub release's notes. Each line is one change: what
 to do about it, and a link to the guide with the detail. [CONTRIBUTING.md](CONTRIBUTING.md#changelog)
 has the rules.
 
-## [10.4.0]
+## [10.4.0] — 2026-10-26
 
 Some calls answer differently: [Changed answers in 10.4.0](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/docs/migration.md#changed-answers-in-1040).
 
diff --git a/src/CodoMetis.ValueRanges.EFCore.PostgreSQL.NodaTime/CHANGELOG.md b/src/CodoMetis.ValueRanges.EFCore.PostgreSQL.NodaTime/CHANGELOG.md
index 0f35129..a2addf6 100644
--- a/src/CodoMetis.ValueRanges.EFCore.PostgreSQL.NodaTime/CHANGELOG.md
+++ b/src/CodoMetis.ValueRanges.EFCore.PostgreSQL.NodaTime/CHANGELOG.md
@@ -3,7 +3,7 @@
 The changes that affect the NodaTime EF Core package. The [root changelog](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/CHANGELOG.md)
 covers all four packages, which share one version number and release together.
 
-## [10.4.0]
+## [10.4.0] — 2026-10-26
 
 Some calls answer differently: [Changed answers in 10.4.0](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/docs/migration.md#changed-answers-in-1040).
 
diff --git a/src/CodoMetis.ValueRanges.EFCore.PostgreSQL/CHANGELOG.md b/src/CodoMetis.ValueRanges.EFCore.PostgreSQL/CHANGELOG.md
index 2b403e7..1b8d0d8 100644
--- a/src/CodoMetis.ValueRanges.EFCore.PostgreSQL/CHANGELOG.md
+++ b/src/CodoMetis.ValueRanges.EFCore.PostgreSQL/CHANGELOG.md
@@ -3,7 +3,7 @@
 The changes that affect the EF Core (Npgsql) package. The [root changelog](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/CHANGELOG.md)
 covers all four packages, which share one version number and release together.
 
-## [10.4.0]
+## [10.4.0] — 2026-10-26
 
 Some calls answer differently: [Changed answers in 10.4.0](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/docs/migration.md#changed-answers-in-1040).
 
diff --git a/src/CodoMetis.ValueRanges.NodaTime/CHANGELOG.md b/src/CodoMetis.ValueRanges.NodaTime/CHANGELOG.md
index 4aacc21..f5f919b 100644
--- a/src/CodoMetis.ValueRanges.NodaTime/CHANGELOG.md
+++ b/src/CodoMetis.ValueRanges.NodaTime/CHANGELOG.md
@@ -3,7 +3,7 @@
 The changes that affect the NodaTime package. The [root changelog](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/CHANGELOG.md)
 covers all four packages, which share one version number and release together.
 
-## [10.4.0]
+## [10.4.0] — 2026-10-26
 
 No change in this package.
 
diff --git a/src/CodoMetis.ValueRanges/CHANGELOG.md b/src/CodoMetis.ValueRanges/CHANGELOG.md
index cc599f3..40d57d3 100644
--- a/src/CodoMetis.ValueRanges/CHANGELOG.md
+++ b/src/CodoMetis.ValueRanges/CHANGELOG.md
@@ -3,7 +3,7 @@
 The changes that affect the core package. The [root changelog](https://github.com/CaffeinatedCoder/CodoMetis.ValueRanges/blob/main/CHANGELOG.md)
 covers all four packages, which share one version number and release together.
 
-## [10.4.0]
+## [10.4.0] — 2026-10-26
 
 No change in this package.