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node_modules/vitepress/dist/client/theme-default/components/VPDocFooterLastUpdated.vue

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+<script setup lang="ts">
+import { useNavigatorLanguage } from '@vueuse/core'
+import { computed, onMounted, shallowRef, useTemplateRef, watchEffect } from 'vue'
+import { useData } from '../composables/data'
+
+const { theme, page, lang: pageLang } = useData()
+const { language: browserLang } = useNavigatorLanguage()
+
+const timeRef = useTemplateRef('timeRef')
+
+const date = computed(() => new Date(page.value.lastUpdated!))
+const isoDatetime = computed(() => date.value.toISOString())
+const datetime = shallowRef('')
+
+// set time on mounted hook to avoid hydration mismatch due to
+// potential differences in timezones of the server and clients
+onMounted(() => {
+  watchEffect(() => {
+    const lang = theme.value.lastUpdated?.formatOptions?.forceLocale
+      ? pageLang.value
+      : browserLang.value
+
+    datetime.value = new Intl.DateTimeFormat(
+      lang,
+      theme.value.lastUpdated?.formatOptions ?? {
+        dateStyle: 'medium',
+        timeStyle: 'medium'
+      }
+    ).format(date.value)
+
+    if (lang && pageLang.value !== lang) {
+      timeRef.value?.setAttribute('lang', lang)
+    } else {
+      timeRef.value?.removeAttribute('lang')
+    }
+  })
+})
+</script>
+
+<template>
+  <p class="VPLastUpdated">
+    {{ theme.lastUpdated?.text || theme.lastUpdatedText || 'Last updated' }}:
+    <time ref="timeRef" :datetime="isoDatetime">{{ datetime }}</time>
+  </p>
+</template>
+
+<style scoped>
+.VPLastUpdated {
+  line-height: 24px;
+  font-size: 14px;
+  font-weight: 500;
+  color: var(--vp-c-text-2);
+}
+
+@media (min-width: 640px) {
+  .VPLastUpdated {
+    line-height: 32px;
+    font-size: 14px;
+    font-weight: 500;
+  }
+}
+</style>