1 files changed, 56 insertions, 0 deletions
diff --git a/packages/frontend/src/components/global/MkTime.vue b/packages/frontend/src/components/global/MkTime.vue
new file mode 100644
index 0000000000..f72b153f56
--- /dev/null
+++ b/packages/frontend/src/components/global/MkTime.vue
@@ -0,0 +1,56 @@
+<template>
+<time :title="absolute">
+	<template v-if="mode === 'relative'">{{ relative }}</template>
+	<template v-else-if="mode === 'absolute'">{{ absolute }}</template>
+	<template v-else-if="mode === 'detail'">{{ absolute }} ({{ relative }})</template>
+</time>
+</template>
+
+<script lang="ts" setup>
+import { onUnmounted } from 'vue';
+import { i18n } from '@/i18n';
+
+const props = withDefaults(defineProps<{
+	time: Date | string;
+	mode?: 'relative' | 'absolute' | 'detail';
+}>(), {
+	mode: 'relative',
+});
+
+const _time = typeof props.time === 'string' ? new Date(props.time) : props.time;
+const absolute = _time.toLocaleString();
+
+let now = $shallowRef(new Date());
+const relative = $computed(() => {
+	const ago = (now.getTime() - _time.getTime()) / 1000/*ms*/;
+	return (
+		ago >= 31536000 ? i18n.t('_ago.yearsAgo', { n: Math.round(ago / 31536000).toString() }) :
+		ago >= 2592000 ? i18n.t('_ago.monthsAgo', { n: Math.round(ago / 2592000).toString() }) :
+		ago >= 604800 ? i18n.t('_ago.weeksAgo', { n: Math.round(ago / 604800).toString() }) :
+		ago >= 86400 ? i18n.t('_ago.daysAgo', { n: Math.round(ago / 86400).toString() }) :
+		ago >= 3600 ? i18n.t('_ago.hoursAgo', { n: Math.round(ago / 3600).toString() }) :
+		ago >= 60 ? i18n.t('_ago.minutesAgo', { n: (~~(ago / 60)).toString() }) :
+		ago >= 10 ? i18n.t('_ago.secondsAgo', { n: (~~(ago % 60)).toString() }) :
+		ago >= -1 ? i18n.ts._ago.justNow :
+		i18n.ts._ago.future);
+});
+
+function tick() {
+	// TODO: パフォーマンス向上のため、このコンポーネントが画面内に表示されている場合のみ更新する
+	now = new Date();
+
+	tickId = window.setTimeout(() => {
+		window.requestAnimationFrame(tick);
+	}, 10000);
+}
+
+let tickId: number;
+
+if (props.mode === 'relative' || props.mode === 'detail') {
+	tickId = window.requestAnimationFrame(tick);
+
+	onUnmounted(() => {
+		window.cancelAnimationFrame(tickId);
+	});
+}
+</script>