diff --git a/assets/javascripts/discourse/api-initializers/discourse-group-timezones.gjs b/assets/javascripts/discourse/api-initializers/discourse-group-timezones.gjs
new file mode 100644
index 00000000..e07a8320
--- /dev/null
+++ b/assets/javascripts/discourse/api-initializers/discourse-group-timezones.gjs
@@ -0,0 +1,35 @@
+import { apiInitializer } from "discourse/lib/api";
+import GroupTimezones from "../components/group-timezones";
+
+const GroupTimezonesShim = <template>
+  <GroupTimezones
+    @members={{@data.members}}
+    @group={{@data.group}}
+    @size={{@data.size}}
+  />
+</template>;
+
+export default apiInitializer((api) => {
+  api.decorateCookedElement((element, helper) => {
+    element.querySelectorAll(".group-timezones").forEach((el) => {
+      const post = helper.getModel();
+
+      if (!post) {
+        return;
+      }
+
+      const group = el.dataset.group;
+      if (!group) {
+        throw new Error(
+          "Group timezone element is missing 'data-group' attribute"
+        );
+      }
+
+      helper.renderGlimmer(el, GroupTimezonesShim, {
+        group,
+        members: (post.group_timezones || {})[group] || [],
+        size: el.dataset.size || "medium",
+      });
+    });
+  });
+});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones.js b/assets/javascripts/discourse/components/group-timezones/index.gjs
similarity index 57%
rename from assets/javascripts/discourse/widgets/discourse-group-timezones.js
rename to assets/javascripts/discourse/components/group-timezones/index.gjs
index 49f7ae23..98d8e75b 100644
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones.js
+++ b/assets/javascripts/discourse/components/group-timezones/index.gjs
@@ -1,38 +1,27 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-import roundTime from "../lib/round-time";
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { fn } from "@ember/helper";
+import { on } from "@ember/modifier";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import { eq } from "truth-helpers";
+import { i18n } from "discourse-i18n";
+import roundTime from "../../lib/round-time";
+import NewDay from "./new-day";
+import TimeTraveller from "./time-traveller";
+import Timezone from "./timezone";
 
-export default createWidget("discourse-group-timezones", {
-  tagName: "div.group-timezones",
+export default class GroupTimezones extends Component {
+  @service siteSettings;
 
-  buildKey: (attrs) => `group-timezones-${attrs.id}`,
+  @tracked filter = "";
+  @tracked localTimeOffset = 0;
 
-  buildClasses(attrs) {
-    return attrs.size;
-  },
-
-  buildAttributes(attrs) {
-    return {
-      id: attrs.id,
-    };
-  },
-
-  defaultState() {
-    return {
-      localTimeOffset: 0,
-    };
-  },
-
-  onChangeCurrentUserTimeOffset(offset) {
-    this.state.localTimeOffset = offset;
-  },
-
-  transform(attrs, state) {
-    const members = attrs.members || [];
+  get groupedTimezones() {
     let groupedTimezones = [];
 
-    members.filterBy("timezone").forEach((member) => {
-      if (this._shouldAddMemberToGroup(this.state.filter, member)) {
+    this.args.members.filterBy("timezone").forEach((member) => {
+      if (this.#shouldAddMemberToGroup(this.filter, member)) {
         const timezone = member.timezone;
         const identifier = parseInt(moment.tz(timezone).format("YYYYMDHm"), 10);
         let groupedTimezone = groupedTimezones.findBy("identifier", identifier);
@@ -40,18 +29,18 @@ export default createWidget("discourse-group-timezones", {
         if (groupedTimezone) {
           groupedTimezone.members.push(member);
         } else {
-          const now = this._roundMoment(moment.tz(timezone));
-          const workingDays = this._workingDays();
+          const now = this.#roundMoment(moment.tz(timezone));
+          const workingDays = this.#workingDays();
           const offset = moment.tz(moment.utc(), timezone).utcOffset();
 
           groupedTimezone = {
             identifier,
             offset,
             type: "discourse-group-timezone",
-            nowWithOffset: now.add(state.localTimeOffset, "minutes"),
-            closeToWorkingHours: this._closeToWorkingHours(now, workingDays),
-            inWorkingHours: this._inWorkingHours(now, workingDays),
-            utcOffset: this._utcOffset(offset),
+            nowWithOffset: now.add(this.localTimeOffset, "minutes"),
+            closeToWorkingHours: this.#closeToWorkingHours(now, workingDays),
+            inWorkingHours: this.#inWorkingHours(now, workingDays),
+            utcOffset: this.#utcOffset(offset),
             members: [member],
           };
           groupedTimezones.push(groupedTimezone);
@@ -84,36 +73,10 @@ export default createWidget("discourse-group-timezones", {
       });
     }
 
-    return { groupedTimezones };
-  },
+    return groupedTimezones;
+  }
 
-  onChangeFilter(filter) {
-    this.state.filter = filter && filter.length ? filter : null;
-  },
-
-  template: hbs`
-    {{attach
-      widget="discourse-group-timezones-header"
-      attrs=(hash
-        id=attrs.id
-        group=attrs.group
-        localTimeOffset=state.localTimeOffset
-      )
-    }}
-    <div class="group-timezones-body">
-      {{#each transformed.groupedTimezones as |groupedTimezone|}}
-        {{attach
-          widget=groupedTimezone.type
-          attrs=(hash
-            usersOnHoliday=attrs.usersOnHoliday
-            groupedTimezone=groupedTimezone
-          )
-        }}
-      {{/each}}
-    </div>
-  `,
-
-  _shouldAddMemberToGroup(filter, member) {
+  #shouldAddMemberToGroup(filter, member) {
     if (filter) {
       filter = filter.toLowerCase();
       if (
@@ -127,17 +90,17 @@ export default createWidget("discourse-group-timezones", {
     }
 
     return false;
-  },
+  }
 
-  _roundMoment(date) {
-    if (this.state.localTimeOffset) {
+  #roundMoment(date) {
+    if (this.localTimeOffset) {
       date = roundTime(date);
     }
 
     return date;
-  },
+  }
 
-  _closeToWorkingHours(moment, workingDays) {
+  #closeToWorkingHours(moment, workingDays) {
     const hours = moment.hours();
     const startHour = this.siteSettings.working_day_start_hour;
     const endHour = this.siteSettings.working_day_end_hour;
@@ -148,18 +111,18 @@ export default createWidget("discourse-group-timezones", {
         (hours <= Math.min(endHour + extension, 23) && hours >= endHour)) &&
       workingDays.includes(moment.isoWeekday())
     );
-  },
+  }
 
-  _inWorkingHours(moment, workingDays) {
+  #inWorkingHours(moment, workingDays) {
     const hours = moment.hours();
     return (
       hours > this.siteSettings.working_day_start_hour &&
       hours < this.siteSettings.working_day_end_hour &&
       workingDays.includes(moment.isoWeekday())
     );
-  },
+  }
 
-  _utcOffset(offset) {
+  #utcOffset(offset) {
     const sign = Math.sign(offset) === 1 ? "+" : "-";
     offset = Math.abs(offset);
     let hours = Math.floor(offset / 60).toString();
@@ -170,9 +133,9 @@ export default createWidget("discourse-group-timezones", {
       /:00$/,
       ""
     )}`.replace(/-0/, "&nbsp;");
-  },
+  }
 
-  _workingDays() {
+  #workingDays() {
     const enMoment = moment().locale("en");
     const getIsoWeekday = (day) =>
       enMoment.localeData()._weekdays.indexOf(day) || 7;
@@ -180,5 +143,40 @@ export default createWidget("discourse-group-timezones", {
       .split("|")
       .filter(Boolean)
       .map((x) => getIsoWeekday(x));
-  },
-});
+  }
+
+  @action
+  handleFilterChange(event) {
+    this.filter = event.target.value;
+  }
+
+  <template>
+    <div class="group-timezones-header">
+      <TimeTraveller
+        @localTimeOffset={{this.localTimeOffset}}
+        @setOffset={{fn (mut this.localTimeOffset)}}
+      />
+      <span class="title">
+        {{i18n "group_timezones.group_availability" group=@group}}
+      </span>
+      <input
+        type="text"
+        placeholder={{i18n "group_timezones.search"}}
+        class="group-timezones-filter"
+        {{on "input" this.handleFilterChange}}
+      />
+    </div>
+    <div class="group-timezones-body">
+      {{#each this.groupedTimezones key="identifier" as |groupedTimezone|}}
+        {{#if (eq groupedTimezone.type "discourse-group-timezone-new-day")}}
+          <NewDay
+            @beforeDate={{groupedTimezone.beforeDate}}
+            @afterDate={{groupedTimezone.afterDate}}
+          />
+        {{else}}
+          <Timezone @groupedTimezone={{groupedTimezone}} />
+        {{/if}}
+      {{/each}}
+    </div>
+  </template>
+}
diff --git a/assets/javascripts/discourse/components/group-timezones/new-day.gjs b/assets/javascripts/discourse/components/group-timezones/new-day.gjs
new file mode 100644
index 00000000..121c7cb9
--- /dev/null
+++ b/assets/javascripts/discourse/components/group-timezones/new-day.gjs
@@ -0,0 +1,16 @@
+import icon from "discourse/helpers/d-icon";
+
+const NewDay = <template>
+  <div class="group-timezone-new-day">
+    <span class="before">
+      {{icon "chevron-left"}}
+      {{@beforeDate}}
+    </span>
+    <span class="after">
+      {{@afterDate}}
+      {{icon "chevron-right"}}
+    </span>
+  </div>
+</template>;
+
+export default NewDay;
diff --git a/assets/javascripts/discourse/components/group-timezones/time-traveller.gjs b/assets/javascripts/discourse/components/group-timezones/time-traveller.gjs
new file mode 100644
index 00000000..c6f07176
--- /dev/null
+++ b/assets/javascripts/discourse/components/group-timezones/time-traveller.gjs
@@ -0,0 +1,58 @@
+import Component from "@glimmer/component";
+import { on } from "@ember/modifier";
+import { action } from "@ember/object";
+import { not } from "truth-helpers";
+import DButton from "discourse/components/d-button";
+import roundTime from "../../lib/round-time";
+
+export default class TimeTraveller extends Component {
+  get localTimeWithOffset() {
+    let date = moment().add(this.args.localTimeOffset, "minutes");
+
+    if (this.args.localTimeOffset) {
+      date = roundTime(date);
+    }
+
+    return date.format("HH:mm");
+  }
+
+  @action
+  reset() {
+    this.args.setOffset(0);
+  }
+
+  @action
+  sliderMoved(event) {
+    const value = parseInt(event.target.value, 10);
+    const offset = value * 15;
+    this.args.setOffset(offset);
+  }
+
+  <template>
+    <div class="group-timezones-time-traveler">
+      <span class="time">
+        {{this.localTimeWithOffset}}
+      </span>
+
+      <span class="discourse-group-timezones-slider-wrapper">
+        <input
+          class="group-timezones-slider"
+          {{on "input" this.sliderMoved}}
+          step="1"
+          value="0"
+          type="range"
+          min="-48"
+          max="48"
+        />
+      </span>
+
+      <div class="group-timezones-reset">
+        <DButton
+          disabled={{not @localTimeOffset}}
+          @action={{this.reset}}
+          @icon="arrow-rotate-left"
+        />
+      </div>
+    </div>
+  </template>
+}
diff --git a/assets/javascripts/discourse/components/group-timezones/timezone.gjs b/assets/javascripts/discourse/components/group-timezones/timezone.gjs
new file mode 100644
index 00000000..2e1f854a
--- /dev/null
+++ b/assets/javascripts/discourse/components/group-timezones/timezone.gjs
@@ -0,0 +1,44 @@
+import Component from "@glimmer/component";
+import UserAvatar from "discourse/components/user-avatar";
+import concatClass from "discourse/helpers/concat-class";
+
+export default class GroupTimezone extends Component {
+  get formattedTime() {
+    return this.args.groupedTimezone.nowWithOffset.format("LT");
+  }
+
+  <template>
+    <div
+      class={{concatClass
+        "group-timezone"
+        (if @groupedTimezone.closeToWorkingHours "close-to-working-hours")
+        (if @groupedTimezone.inWorkingHours "in-working-hours")
+      }}
+    >
+      <div class="info">
+        <span class="time">
+          {{this.formattedTime}}
+        </span>
+        <span class="offset" title="UTC offset">
+          {{@groupedTimezone.utcOffset}}
+        </span>
+      </div>
+      <ul class="group-timezones-members">
+        {{#each @groupedTimezone.members key="username" as |member|}}
+          <li
+            class={{concatClass
+              "group-timezones-member"
+              (if member.on_holiday "on-holiday" "not-on-holiday")
+            }}
+          >
+            <UserAvatar
+              @user={{member}}
+              @size="small"
+              class="group-timezones-member-avatar"
+            />
+          </li>
+        {{/each}}
+      </ul>
+    </div>
+  </template>
+}
diff --git a/assets/javascripts/discourse/initializers/discourse-group-timezones.js b/assets/javascripts/discourse/initializers/discourse-group-timezones.js
deleted file mode 100644
index 1d5f4d26..00000000
--- a/assets/javascripts/discourse/initializers/discourse-group-timezones.js
+++ /dev/null
@@ -1,72 +0,0 @@
-import $ from "jquery";
-import { getRegister } from "discourse/lib/get-owner";
-import { withPluginApi } from "discourse/lib/plugin-api";
-import WidgetGlue from "discourse/widgets/glue";
-
-export default {
-  name: "discourse-group-timezones",
-
-  initialize() {
-    withPluginApi("0.8.7", (api) => {
-      let _glued = [];
-
-      function cleanUp() {
-        _glued.forEach((g) => g.cleanUp());
-        _glued = [];
-      }
-
-      function _attachWidget(container, options) {
-        const glue = new WidgetGlue(
-          "discourse-group-timezones",
-          getRegister(api),
-          options
-        );
-        glue.appendTo(container);
-        _glued.push(glue);
-      }
-
-      function _attachGroupTimezones($elem, post) {
-        const $groupTimezones = $(".group-timezones", $elem);
-
-        if (!$groupTimezones.length) {
-          return;
-        }
-
-        $groupTimezones.each((idx, groupTimezone) => {
-          const group = groupTimezone.getAttribute("data-group");
-          if (!group) {
-            throw "[group] attribute is necessary when using timezones.";
-          }
-
-          const members = (post.get("group_timezones") || {})[group] || [];
-
-          _attachWidget(groupTimezone, {
-            id: `${post.id}-${idx}`,
-            members,
-            group,
-            usersOnHoliday:
-              api.container.lookup("service:site").users_on_holiday || [],
-            size: groupTimezone.getAttribute("data-size") || "medium",
-          });
-        });
-      }
-
-      function _attachPostWithGroupTimezones($elem, helper) {
-        if (helper) {
-          const post = helper.getModel();
-
-          if (post) {
-            api.preventCloak(post.id);
-            _attachGroupTimezones($elem, post);
-          }
-        }
-      }
-
-      api.decorateCooked(_attachPostWithGroupTimezones, {
-        id: "discourse-group-timezones",
-      });
-
-      api.cleanupStream(cleanUp);
-    });
-  },
-};
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezone-new-day.js b/assets/javascripts/discourse/widgets/discourse-group-timezone-new-day.js
deleted file mode 100644
index fdf5e95f..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezone-new-day.js
+++ /dev/null
@@ -1,17 +0,0 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-
-export default createWidget("discourse-group-timezone-new-day", {
-  tagName: "div.group-timezone-new-day",
-
-  template: hbs`
-    <span class="before">
-      {{d-icon "chevron-left"}}
-      {{this.attrs.groupedTimezone.beforeDate}}
-    </span>
-    <span class="after">
-      {{this.attrs.groupedTimezone.afterDate}}
-      {{d-icon "chevron-right"}}
-    </span>
-  `,
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezone.js b/assets/javascripts/discourse/widgets/discourse-group-timezone.js
deleted file mode 100644
index 6a856689..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezone.js
+++ /dev/null
@@ -1,48 +0,0 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-
-export default createWidget("discourse-group-timezone", {
-  tagName: "div.group-timezone",
-
-  buildClasses(attrs) {
-    const classes = [];
-
-    if (attrs.groupedTimezone.closeToWorkingHours) {
-      classes.push("close-to-working-hours");
-    }
-
-    if (attrs.groupedTimezone.inWorkingHours) {
-      classes.push("in-working-hours");
-    }
-
-    return classes.join(" ");
-  },
-
-  transform(attrs) {
-    return {
-      formatedTime: attrs.groupedTimezone.nowWithOffset.format("LT"),
-    };
-  },
-
-  template: hbs`
-    <div class="info">
-      <span class="time">
-        {{transformed.formatedTime}}
-      </span>
-      <span class="offset" title="UTC offset">
-        {{{attrs.groupedTimezone.utcOffset}}}
-      </span>
-    </div>
-    <ul class="group-timezones-members">
-      {{#each attrs.groupedTimezone.members as |member|}}
-        {{attach
-          widget="discourse-group-timezones-member"
-          attrs=(hash
-            usersOnHoliday=attrs.usersOnHoliday
-            member=member
-          )
-        }}
-      {{/each}}
-    </ul>
-  `,
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-filter.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-filter.js
deleted file mode 100644
index 3b38d55b..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-filter.js
+++ /dev/null
@@ -1,28 +0,0 @@
-import { throttle } from "@ember/runloop";
-import { createWidget } from "discourse/widgets/widget";
-import { i18n } from "discourse-i18n";
-
-export default createWidget("discourse-group-timezones-filter", {
-  tagName: "input.group-timezones-filter",
-
-  input(event) {
-    this.changeFilterThrottler(event.target.value);
-  },
-
-  changeFilterThrottler(filter) {
-    throttle(
-      this,
-      function () {
-        this.sendWidgetAction("onChangeFilter", filter);
-      },
-      100
-    );
-  },
-
-  buildAttributes() {
-    return {
-      type: "text",
-      placeholder: i18n("group_timezones.search"),
-    };
-  },
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-header.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-header.js
deleted file mode 100644
index 867904f9..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-header.js
+++ /dev/null
@@ -1,29 +0,0 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-import { i18n } from "discourse-i18n";
-
-export default createWidget("discourse-group-timezones-header", {
-  tagName: "div.group-timezones-header",
-
-  transform(attrs) {
-    return {
-      title: i18n("group_timezones.group_availability", {
-        group: attrs.group,
-      }),
-    };
-  },
-
-  template: hbs`
-    {{attach
-      widget="discourse-group-timezones-time-traveler"
-      attrs=(hash
-        id=attrs.id
-        localTimeOffset=attrs.localTimeOffset
-      )
-    }}
-    <span class="title">
-      {{transformed.title}}
-    </span>
-    {{attach widget="discourse-group-timezones-filter"}}
-  `,
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-member.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-member.js
deleted file mode 100644
index e4f1a73e..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-member.js
+++ /dev/null
@@ -1,30 +0,0 @@
-import { h } from "virtual-dom";
-import { formatUsername } from "discourse/lib/utilities";
-import { avatarImg } from "discourse/widgets/post";
-import { createWidget } from "discourse/widgets/widget";
-
-export default createWidget("discourse-group-timezones-member", {
-  tagName: "li.group-timezones-member",
-
-  buildClasses(attrs) {
-    return attrs.member.on_holiday ? "on-holiday" : "not-on-holiday";
-  },
-
-  html(attrs) {
-    const { name, username, avatar_template } = attrs.member;
-
-    return h(
-      "a",
-      {
-        attributes: {
-          class: "group-timezones-member-avatar",
-          "data-user-card": username,
-        },
-      },
-      avatarImg("small", {
-        template: avatar_template,
-        username: name || formatUsername(username),
-      })
-    );
-  },
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-reset.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-reset.js
deleted file mode 100644
index 99c23db2..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-reset.js
+++ /dev/null
@@ -1,35 +0,0 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-
-export default createWidget("discourse-group-timezones-reset", {
-  tagName: "div.group-timezones-reset",
-
-  onResetOffset() {
-    this.sendWidgetAction("onChangeCurrentUserTimeOffset", 0);
-
-    const container = document.getElementById(this.attrs.id);
-    const slider = container.querySelector(
-      "input[type=range].group-timezones-slider"
-    );
-    if (slider) {
-      slider.value = 0;
-    }
-  },
-
-  transform(attrs) {
-    return {
-      isDisabled: attrs.localTimeOffset === 0,
-    };
-  },
-
-  template: hbs`
-    {{attach
-      widget="button"
-      attrs=(hash
-        disabled=this.transformed.isDisabled
-        action="onResetOffset"
-        icon="arrow-rotate-left"
-      )
-    }}
-  `,
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-slider.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-slider.js
deleted file mode 100644
index 8b2ec430..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-slider.js
+++ /dev/null
@@ -1,40 +0,0 @@
-import { throttle } from "@ember/runloop";
-import { createWidget } from "discourse/widgets/widget";
-
-export default createWidget("discourse-group-timezones-slider", {
-  tagName: "input.group-timezones-slider",
-
-  input(event) {
-    this._handleSliderEvent(event);
-  },
-
-  change(event) {
-    this._handleSliderEvent(event);
-  },
-
-  changeOffsetThrottler(offset) {
-    throttle(
-      this,
-      function () {
-        this.sendWidgetAction("onChangeCurrentUserTimeOffset", offset);
-      },
-      75
-    );
-  },
-
-  buildAttributes() {
-    return {
-      step: 1,
-      value: 0,
-      min: -48,
-      max: 48,
-      type: "range",
-    };
-  },
-
-  _handleSliderEvent(event) {
-    const value = parseInt(event.target.value, 10);
-    const offset = value * 15;
-    this.changeOffsetThrottler(offset);
-  },
-});
diff --git a/assets/javascripts/discourse/widgets/discourse-group-timezones-time-traveler.js b/assets/javascripts/discourse/widgets/discourse-group-timezones-time-traveler.js
deleted file mode 100644
index b25cc4a4..00000000
--- a/assets/javascripts/discourse/widgets/discourse-group-timezones-time-traveler.js
+++ /dev/null
@@ -1,37 +0,0 @@
-import hbs from "discourse/widgets/hbs-compiler";
-import { createWidget } from "discourse/widgets/widget";
-import roundTime from "../lib/round-time";
-
-export default createWidget("discourse-group-timezones-time-traveler", {
-  tagName: "div.group-timezones-time-traveler",
-
-  transform(attrs) {
-    let date = moment().add(attrs.localTimeOffset, "minutes");
-
-    if (attrs.localTimeOffset) {
-      date = roundTime(date);
-    }
-
-    return {
-      localTimeWithOffset: date.format("HH:mm"),
-    };
-  },
-
-  template: hbs`
-    <span class="time">
-      {{transformed.localTimeWithOffset}}
-    </span>
-    <span class="discourse-group-timezones-slider-wrapper">
-      {{attach
-        widget="discourse-group-timezones-slider"
-      }}
-    </span>
-    {{attach
-      widget="discourse-group-timezones-reset"
-      attrs=(hash
-        id=attrs.id
-        localTimeOffset=attrs.localTimeOffset
-      )
-    }}
-  `,
-});
diff --git a/spec/system/group_timezones_spec.rb b/spec/system/group_timezones_spec.rb
new file mode 100644
index 00000000..b5fecbef
--- /dev/null
+++ b/spec/system/group_timezones_spec.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+describe "Group timezones feature", type: :system do
+  fab!(:group) { Fabricate(:group, name: "test-group") }
+
+  fab!(:users) do
+    Fabricate
+      .times(5, :user)
+      .each do |user|
+        user.user_option.timezone = "America/New_York"
+        user.user_option.save!
+        group.add(user)
+      end
+  end
+
+  before do
+    Jobs.run_immediately!
+    SiteSetting.calendar_enabled = true
+  end
+
+  let(:post) { create_post(raw: <<~RAW) }
+    [timezones group="test-group"]
+    [/timezones]
+  RAW
+
+  it "renders successfully" do
+    visit(post.url)
+    expect(page).to have_selector(".group-timezones")
+    expect(page).to have_selector(".group-timezones-member", count: 5)
+  end
+end