diff --git a/l10n/messages.pot b/l10n/messages.pot
index 01710efedd..26e98f0e55 100644
--- a/l10n/messages.pot
+++ b/l10n/messages.pot
@@ -211,10 +211,6 @@ msgstr ""
 msgid "Frequently used"
 msgstr ""
 
-#. TRANSLATORS: This refers to global timezones in the timezone picker
-msgid "Global"
-msgstr ""
-
 msgid "Go back to the list"
 msgstr ""
 
diff --git a/package-lock.json b/package-lock.json
index b0edd8fc20..e4b4d58f65 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -21,7 +21,6 @@
         "@nextcloud/logger": "^3.0.2",
         "@nextcloud/router": "^3.0.1",
         "@nextcloud/sharing": "^0.3.0",
-        "@nextcloud/timezones": "^1.0.0",
         "@vuepic/vue-datepicker": "^11.0.2",
         "@vueuse/components": "^13.9.0",
         "@vueuse/core": "^13.9.0",
@@ -3523,18 +3522,6 @@
         "stylelint-config-recommended-vue": "^1.5.0"
       }
     },
-    "node_modules/@nextcloud/timezones": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@nextcloud/timezones/-/timezones-1.0.0.tgz",
-      "integrity": "sha512-9b7Wms2mzB4RAltf8s9dY40PcU5ova5QjQJw1Gty35e54alKyx33BqUOy4gEbkzmYSrW4aZcLcMrOO5Bj2eIzg==",
-      "license": "AGPL-3.0-or-later",
-      "dependencies": {
-        "ical.js": "^2.1.0"
-      },
-      "engines": {
-        "node": "^20 || ^22"
-      }
-    },
     "node_modules/@nextcloud/typings": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/@nextcloud/typings/-/typings-1.9.1.tgz",
@@ -13457,12 +13444,6 @@
       "dev": true,
       "license": "BSD-3-Clause"
     },
-    "node_modules/ical.js": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ical.js/-/ical.js-2.2.1.tgz",
-      "integrity": "sha512-yK/UlPbEs316igb/tjRgbFA8ZV75rCsBJp/hWOatpyaPNlgw0dGDmU+FoicOcwX4xXkeXOkYiOmCqNPFpNPkQg==",
-      "license": "MPL-2.0"
-    },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
diff --git a/package.json b/package.json
index 138da927f8..87f25b25b0 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,6 @@
     "@nextcloud/logger": "^3.0.2",
     "@nextcloud/router": "^3.0.1",
     "@nextcloud/sharing": "^0.3.0",
-    "@nextcloud/timezones": "^1.0.0",
     "@vuepic/vue-datepicker": "^11.0.2",
     "@vueuse/components": "^13.9.0",
     "@vueuse/core": "^13.9.0",
diff --git a/src/components/NcTimezonePicker/NcTimezonePicker.vue b/src/components/NcTimezonePicker/NcTimezonePicker.vue
index 02d512f8ed..f453d75f47 100644
--- a/src/components/NcTimezonePicker/NcTimezonePicker.vue
+++ b/src/components/NcTimezonePicker/NcTimezonePicker.vue
@@ -16,7 +16,7 @@
 export default {
 	data() {
 		return {
-			tz: 'Hawaiian Standard Time',
+			tz: 'Europe/Berlin',
 		}
 	},
 }
@@ -25,21 +25,26 @@ export default {
 </docs>
 
 <script setup lang="ts">
-import type {
-	IContinent,
-	IRegion,
-	ITimezone,
-} from '@nextcloud/timezones'
-
-import {
-	getReadableTimezoneName,
-	getSortedTimezoneList,
-} from '@nextcloud/timezones'
 import { computed } from 'vue'
+import NcSelect from '../NcSelect/NcSelect.vue'
 import { t } from '../../l10n.ts'
 import { createElementId } from '../../utils/createElementId.ts'
-import NcSelect from '../NcSelect/index.js'
-import getTimezoneManager from './timezoneDataProviderService.js'
+import { getTimezones } from './timezoneUtils.ts'
+
+export type ITimezone = {
+	/**
+	 * Time zone ID in IANA format, e.g. "Europe/Berlin", or "floating" for a time independent of timezone, or a custom timezone ID
+	 */
+	timezoneId: string
+	/**
+	 * Localized label of the timezone, e.g. "Central European Standard Time"
+	 */
+	label: string
+	/**
+	 * Continent the timezone if any, e.g. "Europe" (not localized)
+	 */
+	continent: string
+}
 
 /**
  * The selected timezone.
@@ -63,109 +68,45 @@ const props = withDefaults(defineProps<{
 	uid: createElementId(),
 })
 
-const selectedTimezone = computed({
-	set(timezone: IRegion) {
-		modelValue.value = timezone.timezoneId
-	},
-	get(): IRegion {
-		for (const additionalTimezone of props.additionalTimezones) {
-			if (additionalTimezone.timezoneId === modelValue.value) {
-				return {
-					cities: [],
-					...additionalTimezone,
-				}
-			}
-		}
-
-		return {
-			label: getReadableTimezoneName(modelValue.value),
-			timezoneId: modelValue.value,
-			cities: [],
-		}
-	},
+const formattedAdditionalTimezones = computed(() => {
+	return props.additionalTimezones.map(({ timezoneId, label }) => ({
+		timezoneId,
+		label,
+	}))
 })
 
 const options = computed(() => {
-	const timezoneManager = getTimezoneManager()
-	const timezoneList: IContinent[] = getSortedTimezoneList(
-		timezoneManager.listAllTimezones(),
-		props.additionalTimezones,
-		t('Global'), // TRANSLATORS: This refers to global timezones in the timezone picker
-	)
-	/**
-	 * Since NcSelect does not support groups,
-	 * we create an object with the grouped timezones and continent labels.
-	 *
-	 * NOTE for now we are removing the grouping from the fields to fix an accessibility issue
-	 * in the future, other options can be introduced to better display the different areas
-	 */
-	const timezonesGrouped: IRegion[] = []
-	for (const group of Object.values(timezoneList)) {
-		// Add an entry as group label
-		// const continent = `tz-group__${group.continent}`
-		// timezonesGrouped.push({
-		// label: group.continent,
-		// continent,
-		// timezoneId: continent,
-		// regions: group.regions,
-		// })
-		timezonesGrouped.push(...group.regions)
-	}
-	return timezonesGrouped
+	const timezones = getTimezones()
+	timezones.unshift(...formattedAdditionalTimezones.value)
+	return timezones
 })
 
 /**
- * Returns whether this is a continent label,
- * or an actual timezone. Continent labels are not selectable.
- *
- * @param option The option
- */
-function isSelectable(option: IRegion): boolean {
-	return !option.timezoneId.startsWith('tz-group__')
-}
-
-/**
- * Function to filter the timezone list.
- * We search in the timezoneId, so both continent and region names can be matched.
+ * NcSelect's filterBy prop to search timezone by any option property
  *
  * @param option - The timezone option
  * @param label - The label of the timezone
  * @param search - The search string
  */
-function filterBy(option: IContinent | IRegion, label: string, search: string): boolean {
-	// We split the search term in case one searches "<continent> <region>".
-	const terms = search.trim().split(' ')
-
-	// For the continent labels, we have to check if one region matches every search term.
-	if ('continent' in option) {
-		return option.regions.some((region) => {
-			return matchTimezoneId(region.timezoneId, terms)
-		})
-	}
-
-	// For a region, every search term must be found.
-	return matchTimezoneId(option.timezoneId, terms)
-}
-
-/**
- * @param timezoneId - The timezone id to check
- * @param terms - Terms to validate
- */
-function matchTimezoneId(timezoneId: string, terms: string[]): boolean {
-	return terms.every((term) => timezoneId.toLowerCase().includes(term.toLowerCase()))
+function filterBy(option: ITimezone, label: string, search: string): boolean {
+	const terms = search.trim().split(/\s+/)
+	const values = Object.values(option)
+	return terms.every((term) => {
+		return values.some((value) => value.toLowerCase().includes(term.toLowerCase()))
+	})
 }
 </script>
 
 <template>
 	<NcSelect
-		v-model="selectedTimezone"
+		v-model="modelValue"
 		:aria-label-combobox="t('Search for timezone')"
 		:clearable="false"
 		:filter-by
 		:multiple="false"
 		:options
 		:placeholder="t('Type to search time zone')"
-		:selectable="isSelectable"
 		:uid
+		:reduce="(option) => option.timezoneId"
 		label="label" />
 </template>
diff --git a/src/components/NcTimezonePicker/timezoneDataProviderService.ts b/src/components/NcTimezonePicker/timezoneDataProviderService.ts
deleted file mode 100644
index 923391e358..0000000000
--- a/src/components/NcTimezonePicker/timezoneDataProviderService.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-/**
- * SPDX-FileCopyrightText: 2019 Nextcloud GmbH and Nextcloud contributors
- * SPDX-License-Identifier: AGPL-3.0-or-later
- */
-
-import { getTimezoneManager } from '@nextcloud/timezones'
-
-const timezoneManager = getTimezoneManager()
-let initialized = false
-
-/**
- * Gets the timezone-manager
- * initializes it if necessary
- */
-export default function() {
-	if (!initialized) {
-		timezoneManager.registerDefaultTimezones()
-		initialized = true
-	}
-
-	return timezoneManager
-}
diff --git a/src/components/NcTimezonePicker/timezoneUtils.ts b/src/components/NcTimezonePicker/timezoneUtils.ts
new file mode 100644
index 0000000000..709c4fef6d
--- /dev/null
+++ b/src/components/NcTimezonePicker/timezoneUtils.ts
@@ -0,0 +1,34 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+/**
+ * Convert timezone ID in IANA format (e.g. "Europe/Berlin") to a more human-readable format
+ *
+ * @param timezoneId - IANA timezone ID (e.g. "America/Argentina/San_Juan")
+ * @return Formatted timezone string (e.g. "Argentina - San Juan")
+ */
+function formatTimezoneId(timezoneId: string) {
+	return timezoneId
+		// 'America/Argentina/San_Juan' -> 'Argentina/San_Juan'
+		.slice(timezoneId.indexOf('/') + 1)
+		// 'Argentina/San_Juan' -> 'Argentina - San_Juan'
+		.replaceAll('/', ' - ')
+		// 'San_Juan' -> 'San Juan'
+		.replaceAll('_', ' ')
+}
+
+/**
+ * Get a list of supported IANA timezone IDs (e.g. "Europe/Berlin") with human-readable labels,
+ * excluding Etc/* administrative zones not used by users (see: https://en.wikipedia.org/wiki/Tz_database#Areas)
+ */
+export function getTimezones() {
+	return Intl.supportedValuesOf('timeZone')
+		.filter((tz) => !tz.startsWith('Etc/'))
+		.map((timezoneId) => ({
+			timezoneId,
+			label: formatTimezoneId(timezoneId),
+		}))
+		.sort((a, b) => a.timezoneId.localeCompare(b.timezoneId))
+}