diff --git a/app/assets/javascripts/admin/addon/mixins/period-computation.js b/app/assets/javascripts/admin/addon/mixins/period-computation.js
deleted file mode 100644
index 8e3fb622ea8..00000000000
--- a/app/assets/javascripts/admin/addon/mixins/period-computation.js
+++ /dev/null
@@ -1,71 +0,0 @@
-import { computed } from "@ember/object";
-import Mixin from "@ember/object/mixin";
-import DiscourseURL from "discourse/lib/url";
-import deprecated from "discourse-common/lib/deprecated";
-
-export default Mixin.create({
-  queryParams: ["period"],
-  period: "monthly",
-
-  init() {
-    this._super(...arguments);
-
-    deprecated(
-      "PeriodComputation mixin is deprecated. Use AdminDashboardTabController instead.",
-      {
-        id: "discourse.period-mixin",
-        since: "3.2.0.beta5-dev",
-      }
-    );
-    this.availablePeriods = ["yearly", "quarterly", "monthly", "weekly"];
-  },
-
-  startDate: computed("period", {
-    get() {
-      const period = this.period;
-      const fullDay = moment().locale("en").utc().endOf("day");
-
-      switch (period) {
-        case "yearly":
-          return fullDay.subtract(1, "year").startOf("day");
-        case "quarterly":
-          return fullDay.subtract(3, "month").startOf("day");
-        case "weekly":
-          return fullDay.subtract(6, "days").startOf("day");
-        case "monthly":
-          return fullDay.subtract(1, "month").startOf("day");
-        default:
-          return fullDay.subtract(1, "month").startOf("day");
-      }
-    },
-
-    set(period) {
-      return period;
-    },
-  }),
-
-  get lastWeek() {
-    return moment().locale("en").utc().endOf("day").subtract(1, "week");
-  },
-
-  get lastMonth() {
-    return moment().locale("en").utc().startOf("day").subtract(1, "month");
-  },
-
-  get endDate() {
-    return moment().locale("en").utc().endOf("day");
-  },
-  set endDate(value) {
-    /* noop */
-  },
-
-  get today() {
-    return moment().locale("en").utc().endOf("day");
-  },
-
-  actions: {
-    changePeriod(period) {
-      DiscourseURL.routeTo(this._reportsForPeriodURL(period));
-    },
-  },
-});