diff --git a/.changeset/daring-cats-snooze.md b/.changeset/daring-cats-snooze.md
new file mode 100644
index 000000000..8e51e92d7
--- /dev/null
+++ b/.changeset/daring-cats-snooze.md
@@ -0,0 +1,5 @@
+---
+type: Fixed
+pr: 0
+---
+**`last_activity` now shows your local calendar day** — the clock seam derived the date by slicing a UTC instant, so in negative-UTC-offset zones during UTC's early evening the date-only `last_activity` field jumped a day ahead of the operator's actual date (and of `last_updated`'s local date). Operator-facing date fields now use a host-local calendar day while internal/cosmetic stamps stay UTC. (#2136)