diff --git a/server/model/heartbeat.js b/server/model/heartbeat.js
index 8c9d86456..fa02cae8a 100644
--- a/server/model/heartbeat.js
+++ b/server/model/heartbeat.js
@@ -1,8 +1,4 @@
 const dayjs = require("dayjs");
-const utc = require("dayjs/plugin/utc");
-let timezone = require("dayjs/plugin/timezone");
-dayjs.extend(utc);
-dayjs.extend(timezone);
 const { BeanModel } = require("redbean-node/dist/bean-model");
 
 /**
diff --git a/server/model/maintenance.js b/server/model/maintenance.js
index 3b07d5f7c..945e4d975 100644
--- a/server/model/maintenance.js
+++ b/server/model/maintenance.js
@@ -1,12 +1,9 @@
 const dayjs = require("dayjs");
-const utc = require("dayjs/plugin/utc");
-let timezone = require("dayjs/plugin/timezone");
-dayjs.extend(utc);
-dayjs.extend(timezone);
 const { BeanModel } = require("redbean-node/dist/bean-model");
 const { parseTimeObject, parseTimeFromTimeObject } = require("../../src/util");
 const { isArray } = require("chart.js/helpers");
 const { timeObjectToUTC, timeObjectToLocal } = require("../util-server");
+const { R } = require("redbean-node");
 
 class Maintenance extends BeanModel {
 
@@ -20,17 +17,18 @@ class Maintenance extends BeanModel {
 
         let dateTimeRange = [];
         if (this.start_datetime) {
-            dateTimeRange.push( this.start_datetime);
+
+            dateTimeRange.push(dayjs.utc(this.start_datetime).toISOString());
             if (this.end_datetime) {
-                dateTimeRange.push( this.end_datetime);
+                dateTimeRange.push(dayjs.utc(this.end_datetime).toISOString());
             }
         }
 
         let dateRange = [];
         if (this.start_date) {
-            dateRange.push( this.start_date);
+            dateRange.push(dayjs.utc(this.start_date).toISOString());
             if (this.end_date) {
-                dateRange.push( this.end_date);
+                dateRange.push(dayjs.utc(this.end_date).toISOString());
             }
         }
 
@@ -106,18 +104,18 @@ class Maintenance extends BeanModel {
         bean.active = obj.active;
 
         if (obj.dateRange[0]) {
-            bean.start_date = obj.dateRange[0];
+            bean.start_date = R.isoDate(dayjs(obj.dateRange[0]).utc());
 
             if (obj.dateRange[1]) {
-                bean.end_date = obj.dateRange[1];
+                bean.end_date = R.isoDate(dayjs(obj.dateRange[1]).utc());
             }
         }
 
         if (obj.dateTimeRange[0]) {
-            bean.start_datetime = obj.dateTimeRange[0];
+            bean.start_datetime = R.isoDateTime(dayjs(obj.dateTimeRange[0]).utc());
 
             if (obj.dateTimeRange[1]) {
-                bean.end_datetime = obj.dateTimeRange[1];
+                bean.end_datetime = R.isoDateTime(dayjs(obj.dateTimeRange[1]).utc());
             }
         }
 
@@ -129,6 +127,22 @@ class Maintenance extends BeanModel {
 
         return bean;
     }
+
+    /**
+     * SQL conditions for active maintenance
+     * @returns {string}
+     */
+    static getActiveMaintenanceSQLCondition() {
+        return `
+
+            (maintenance_timeslot.start_date <= DATETIME('now')
+            AND maintenance_timeslot.end_date >= DATETIME('now')
+            AND maintenance.active = 1)
+            AND
+            (maintenance.strategy = 'manual' AND active = 1)
+
+        `;
+    }
 }
 
 module.exports = Maintenance;
diff --git a/server/model/maintenance_timeslot.js b/server/model/maintenance_timeslot.js
index f749caa5b..7917dd697 100644
--- a/server/model/maintenance_timeslot.js
+++ b/server/model/maintenance_timeslot.js
@@ -1,6 +1,7 @@
 const { BeanModel } = require("redbean-node/dist/bean-model");
 const { R } = require("redbean-node");
 const dayjs = require("dayjs");
+const { log } = require("../../src/util");
 
 class MaintenanceTimeslot extends BeanModel {
 
@@ -30,7 +31,9 @@ class MaintenanceTimeslot extends BeanModel {
             ]);
         }
 
-        if (maintenance.strategy === "single") {
+        if (maintenance.strategy === "manual") {
+            log.debug("maintenance", "No need to generate timeslot for manual type");
+        } else if (maintenance.strategy === "single") {
             let bean = R.dispense("maintenance_timeslot");
             bean.maintenance_id = maintenance.id;
             bean.start_date = maintenance.start_datetime;
diff --git a/server/model/monitor.js b/server/model/monitor.js
index a13d70517..9df127b09 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -1,9 +1,5 @@
 const https = require("https");
 const dayjs = require("dayjs");
-const utc = require("dayjs/plugin/utc");
-let timezone = require("dayjs/plugin/timezone");
-dayjs.extend(utc);
-dayjs.extend(timezone);
 const axios = require("axios");
 const { Prometheus } = require("../prometheus");
 const { log, UP, DOWN, PENDING, MAINTENANCE, flipStatus, TimeLogger } = require("../../src/util");
@@ -17,6 +13,7 @@ const version = require("../../package.json").version;
 const apicache = require("../modules/apicache");
 const { UptimeKumaServer } = require("../uptime-kuma-server");
 const { CacheableDnsHttpAgent } = require("../cacheable-dns-http-agent");
+const Maintenance = require("./maintenance");
 
 /**
  * status:
@@ -1105,6 +1102,7 @@ class Monitor extends BeanModel {
      * @returns {Promise<boolean>}
      */
     static async isUnderMaintenance(monitorID) {
+        let activeCondition = Maintenance.getActiveMaintenanceSQLCondition();
         const maintenance = await R.getRow(`
             SELECT COUNT(*) AS count
             FROM monitor_maintenance mm
@@ -1113,8 +1111,7 @@ class Monitor extends BeanModel {
             JOIN maintenance_timeslot
                 ON maintenance_timeslot.maintenance_id = maintenance.id
             WHERE mm.monitor_id = ?
-                AND maintenance_timeslot.start_date <= DATETIME('now')
-                AND maintenance_timeslot.end_date >= DATETIME('now')
+              AND ${activeCondition}
             LIMIT 1`, [ monitorID ]);
         return maintenance.count !== 0;
     }
diff --git a/server/model/status_page.js b/server/model/status_page.js
index 4351db582..0620a1ee0 100644
--- a/server/model/status_page.js
+++ b/server/model/status_page.js
@@ -2,6 +2,7 @@ const { BeanModel } = require("redbean-node/dist/bean-model");
 const { R } = require("redbean-node");
 const cheerio = require("cheerio");
 const { UptimeKumaServer } = require("../uptime-kuma-server");
+const Maintenance = require("./maintenance");
 
 class StatusPage extends BeanModel {
 
@@ -271,14 +272,14 @@ class StatusPage extends BeanModel {
         try {
             const publicMaintenanceList = [];
 
+            let activeCondition = Maintenance.getActiveMaintenanceSQLCondition();
             let maintenanceBeanList = R.convertToBeans("maintenance", await R.getAll(`
                 SELECT m.*
                 FROM maintenance m, maintenance_status_page msp, maintenance_timeslot
                 WHERE  msp.maintenance_id = m.id
-                AND maintenance_timeslot.maintenance.id = m.id
-                AND maintenance_timeslot.start_date <= DATETIME('now')
-                AND maintenance_timeslot.end_date >= DATETIME('now')
-                AND msp.status_page_id = ?
+                    AND maintenance_timeslot.maintenance.id = m.id
+                    AND msp.status_page_id = ?
+                    AND ${activeCondition}
                 ORDER BY m.end_date
             `, [ statusPageId ]));
 
diff --git a/server/server.js b/server/server.js
index 4aec2b275..1ad99899f 100644
--- a/server/server.js
+++ b/server/server.js
@@ -33,6 +33,11 @@ log.info("server", "Importing Node libraries");
 const fs = require("fs");
 
 log.info("server", "Importing 3rd-party libraries");
+
+const dayjs = require("dayjs");
+dayjs.extend(require("dayjs/plugin/utc"));
+dayjs.extend(require("dayjs/plugin/timezone"));
+
 log.debug("server", "Importing express");
 const express = require("express");
 const expressStaticGzip = require("express-static-gzip");
diff --git a/server/socket-handlers/maintenance-socket-handler.js b/server/socket-handlers/maintenance-socket-handler.js
index 5358b53e9..9ae36b5cb 100644
--- a/server/socket-handlers/maintenance-socket-handler.js
+++ b/server/socket-handlers/maintenance-socket-handler.js
@@ -6,11 +6,7 @@ const { UptimeKumaServer } = require("../uptime-kuma-server");
 const Maintenance = require("../model/maintenance");
 const server = UptimeKumaServer.getInstance();
 const dayjs = require("dayjs");
-const utc = require("dayjs/plugin/utc");
-let timezone = require("dayjs/plugin/timezone");
 const MaintenanceTimeslot = require("../model/maintenance_timeslot");
-dayjs.extend(utc);
-dayjs.extend(timezone);
 
 /**
  * Handlers for Maintenance
diff --git a/server/util-server.js b/server/util-server.js
index cc5e478d1..1c5f59142 100644
--- a/server/util-server.js
+++ b/server/util-server.js
@@ -22,10 +22,6 @@ const {
     },
 } = require("node-radius-utils");
 const dayjs = require("dayjs");
-const utc = require("dayjs/plugin/utc");
-let timezone = require("dayjs/plugin/timezone");
-dayjs.extend(utc);
-dayjs.extend(timezone);
 
 // From ping-lite
 exports.WIN = /^win/.test(process.platform);
diff --git a/src/components/Datetime.vue b/src/components/Datetime.vue
index b24ab0b3c..84bae5031 100644
--- a/src/components/Datetime.vue
+++ b/src/components/Datetime.vue
@@ -4,12 +4,6 @@
 
 <script>
 import dayjs from "dayjs";
-import relativeTime from "dayjs/plugin/relativeTime";
-import timezone from "dayjs/plugin/timezone"; // dependent on utc plugin
-import utc from "dayjs/plugin/utc";
-dayjs.extend(utc);
-dayjs.extend(timezone);
-dayjs.extend(relativeTime);
 
 export default {
     props: {
diff --git a/src/components/PingChart.vue b/src/components/PingChart.vue
index 4cece1911..2733e68c9 100644
--- a/src/components/PingChart.vue
+++ b/src/components/PingChart.vue
@@ -16,18 +16,14 @@
     </div>
 </template>
 
-<script lang="ts">
+<script lang="js">
 import { BarController, BarElement, Chart, Filler, LinearScale, LineController, LineElement, PointElement, TimeScale, Tooltip } from "chart.js";
 import "chartjs-adapter-dayjs";
 import dayjs from "dayjs";
-import timezone from "dayjs/plugin/timezone";
-import utc from "dayjs/plugin/utc";
 import { LineChart } from "vue-chart-3";
 import { useToast } from "vue-toastification";
 import { DOWN, PENDING, MAINTENANCE, log } from "../util.ts";
 
-dayjs.extend(utc);
-dayjs.extend(timezone);
 const toast = useToast();
 
 Chart.register(LineController, BarController, LineElement, PointElement, TimeScale, BarElement, LinearScale, Tooltip, Filler);
diff --git a/src/components/settings/General.vue b/src/components/settings/General.vue
index 19dc8077e..242ad8537 100644
--- a/src/components/settings/General.vue
+++ b/src/components/settings/General.vue
@@ -145,11 +145,7 @@
 <script>
 import HiddenInput from "../../components/HiddenInput.vue";
 import dayjs from "dayjs";
-import utc from "dayjs/plugin/utc";
-import timezone from "dayjs/plugin/timezone";
 import { timezoneList } from "../../util-frontend";
-dayjs.extend(utc);
-dayjs.extend(timezone);
 
 export default {
     components: {
diff --git a/src/main.js b/src/main.js
index 7783882b5..5567023fd 100644
--- a/src/main.js
+++ b/src/main.js
@@ -16,6 +16,13 @@ import theme from "./mixins/theme";
 import lang from "./mixins/lang";
 import { router } from "./router";
 import { appName } from "./util.ts";
+import dayjs from "dayjs";
+import timezone from "dayjs/plugin/timezone";
+import utc from "dayjs/plugin/utc";
+import relativeTime from "dayjs/plugin/relativeTime";
+dayjs.extend(utc);
+dayjs.extend(timezone);
+dayjs.extend(relativeTime);
 
 const app = createApp({
     mixins: [
diff --git a/src/mixins/datetime.js b/src/mixins/datetime.js
index 0e5317c64..3bbe11307 100644
--- a/src/mixins/datetime.js
+++ b/src/mixins/datetime.js
@@ -1,10 +1,4 @@
 import dayjs from "dayjs";
-import relativeTime from "dayjs/plugin/relativeTime";
-import timezone from "dayjs/plugin/timezone";
-import utc from "dayjs/plugin/utc";
-dayjs.extend(utc);
-dayjs.extend(timezone);
-dayjs.extend(relativeTime);
 
 /**
  * DateTime Mixin
diff --git a/src/util-frontend.js b/src/util-frontend.js
index 36dac49f9..3323f3279 100644
--- a/src/util-frontend.js
+++ b/src/util-frontend.js
@@ -1,12 +1,7 @@
 import dayjs from "dayjs";
-import timezone from "dayjs/plugin/timezone";
-import utc from "dayjs/plugin/utc";
 import timezones from "timezones-list";
 import { localeDirection, currentLocale } from "./i18n";
 
-dayjs.extend(utc);
-dayjs.extend(timezone);
-
 /**
  * Returns the offset from UTC in hours for the current locale.
  * @returns {number} The offset from UTC in hours.