diff --git a/db/migrate/20231229143820_rename_at_on_exercises.rb b/db/migrate/20231229143820_rename_at_on_exercises.rb
new file mode 100644
index 0000000..80dd427
--- /dev/null
+++ b/db/migrate/20231229143820_rename_at_on_exercises.rb
@@ -0,0 +1,6 @@
+class RenameAtOnExercises < ActiveRecord::Migration[7.1]
+  def change
+    remove_column :exercises, :at
+    add_column :exercises, :occurred_at, :datetime
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index b34f8d4..ade4abf 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2023_12_29_143648) do
+ActiveRecord::Schema[7.1].define(version: 2023_12_29_143820) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -87,11 +87,11 @@ ActiveRecord::Schema[7.1].define(version: 2023_12_29_143648) do
 
   create_table "exercises", force: :cascade do |t|
     t.bigint "exercise_type_id", null: false
-    t.time "at"
     t.float "amount", null: false
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.bigint "diary_entry_id", null: false
+    t.datetime "occurred_at"
     t.index ["diary_entry_id"], name: "index_exercises_on_diary_entry_id"
     t.index ["exercise_type_id"], name: "index_exercises_on_exercise_type_id"
   end
diff --git a/test/fixtures/exercises.yml b/test/fixtures/exercises.yml
index 185768a..0dd2a2e 100644
--- a/test/fixtures/exercises.yml
+++ b/test/fixtures/exercises.yml
@@ -1,11 +1,11 @@
 one:
   exercise_type: running
-  at: 2023-12-29 11:41:45
+  occurred_at: 2023-12-29 11:41:45
   amount: 5
   diary_entry: one
 
 two:
   exercise_type: cycling
-  at: 2023-12-29 11:41:45
+  occurred_at: 2023-12-29 11:41:45
   amount: 10.5
   diary_entry: two