diff --git a/frontend/src/components/account/CreateAccountModal.vue b/frontend/src/components/account/CreateAccountModal.vue
index ae2efff8de..364436d109 100644
--- a/frontend/src/components/account/CreateAccountModal.vue
+++ b/frontend/src/components/account/CreateAccountModal.vue
@@ -2955,7 +2955,10 @@
       <div class="border-t border-gray-200 pt-4 dark:border-dark-600">
         <label class="input-label">{{ t('admin.accounts.expiresAt') }}</label>
         <input v-model="expiresAtInput" type="datetime-local" class="input" />
-        <p class="input-hint">{{ t('admin.accounts.expiresAtHint') }}</p>
+        <p class="input-hint">
+          {{ t('admin.accounts.expiresAtHint') }}
+          {{ t('admin.accounts.expiresAtTimezoneHint', { timezone: browserTimeZone }) }}
+        </p>
       </div>
 
       <!-- OpenAI 自动透传开关（OAuth/API Key） -->
@@ -3820,7 +3823,11 @@ import {
   type CnNativeApiProtocol,
   type HeaderOverrideRow
 } from '@/components/account/credentialsBuilder'
-import { formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
+import {
+  formatDateTimeLocalInput,
+  getBrowserTimeZone,
+  parseDateTimeLocalInput
+} from '@/utils/format'
 import { createStableObjectKeyResolver } from '@/utils/stableObjectKey'
 import { VERTEX_LOCATION_OPTIONS } from '@/constants/account'
 import {
@@ -3852,6 +3859,7 @@ interface OAuthFlowExposed {
 
 const { t } = useI18n()
 const authStore = useAuthStore()
+const browserTimeZone = getBrowserTimeZone()
 
 const oauthStepTitle = computed(() => {
   if (form.platform === 'openai') return t('admin.accounts.oauth.openai.title')
diff --git a/frontend/src/components/account/EditAccountModal.vue b/frontend/src/components/account/EditAccountModal.vue
index 8676fc907b..53d0022f13 100644
--- a/frontend/src/components/account/EditAccountModal.vue
+++ b/frontend/src/components/account/EditAccountModal.vue
@@ -1611,7 +1611,10 @@
       <div class="border-t border-gray-200 pt-4 dark:border-dark-600">
         <label class="input-label">{{ t('admin.accounts.expiresAt') }}</label>
         <input v-model="expiresAtInput" type="datetime-local" class="input" />
-        <p class="input-hint">{{ t('admin.accounts.expiresAtHint') }}</p>
+        <p class="input-hint">
+          {{ t('admin.accounts.expiresAtHint') }}
+          {{ t('admin.accounts.expiresAtTimezoneHint', { timezone: browserTimeZone }) }}
+        </p>
       </div>
 
       <!-- OpenAI 自动透传开关（OAuth/API Key） -->
@@ -2915,7 +2918,12 @@ import {
   type CnNativeApiProtocol,
   type HeaderOverrideRow
 } from '@/components/account/credentialsBuilder'
-import { formatDateTime, formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
+import {
+  formatDateTime,
+  formatDateTimeLocalInput,
+  getBrowserTimeZone,
+  parseDateTimeLocalInput
+} from '@/utils/format'
 import { createStableObjectKeyResolver } from '@/utils/stableObjectKey'
 import { allSelectedGroupsEnableLongContextPricing } from '@/components/account/longContextBilling'
 import { VERTEX_LOCATION_OPTIONS } from '@/constants/account'
@@ -2953,6 +2961,7 @@ const emit = defineEmits<{
 const { t } = useI18n()
 const appStore = useAppStore()
 const authStore = useAuthStore()
+const browserTimeZone = getBrowserTimeZone()
 
 // Spark 影子账号(parent_account_id 非空):代理恒继承母账号,不可独立编辑(外审 B/P1),
 // 故隐藏代理选择器。