整理した

src/client/app/common/views/components/time.vue

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+<template>
+<time class="mk-time">
+	<span v-if=" mode == 'relative' ">{{ relative }}</span>
+	<span v-if=" mode == 'absolute' ">{{ absolute }}</span>
+	<span v-if=" mode == 'detail' ">{{ absolute }} ({{ relative }})</span>
+</time>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+
+export default Vue.extend({
+	props: {
+		time: {
+			type: [Date, String],
+			required: true
+		},
+		mode: {
+			type: String,
+			default: 'relative'
+		}
+	},
+	data() {
+		return {
+			tickId: null,
+			now: new Date()
+		};
+	},
+	computed: {
+		_time(): Date {
+			return typeof this.time == 'string' ? new Date(this.time) : this.time;
+		},
+		absolute(): string {
+			const time = this._time;
+			return (
+				time.getFullYear()    + '年' +
+				(time.getMonth() + 1) + '月' +
+				time.getDate()        + '日' +
+				' ' +
+				time.getHours()       + '時' +
+				time.getMinutes()     + '分');
+		},
+		relative(): string {
+			const time = this._time;
+			const ago = (this.now.getTime() - time.getTime()) / 1000/*ms*/;
+			return (
+				ago >= 31536000 ? '%i18n:common.time.years_ago%'  .replace('{}', (~~(ago / 31536000)).toString()) :
+				ago >= 2592000  ? '%i18n:common.time.months_ago%' .replace('{}', (~~(ago / 2592000)).toString()) :
+				ago >= 604800   ? '%i18n:common.time.weeks_ago%'  .replace('{}', (~~(ago / 604800)).toString()) :
+				ago >= 86400    ? '%i18n:common.time.days_ago%'   .replace('{}', (~~(ago / 86400)).toString()) :
+				ago >= 3600     ? '%i18n:common.time.hours_ago%'  .replace('{}', (~~(ago / 3600)).toString()) :
+				ago >= 60       ? '%i18n:common.time.minutes_ago%'.replace('{}', (~~(ago / 60)).toString()) :
+				ago >= 10       ? '%i18n:common.time.seconds_ago%'.replace('{}', (~~(ago % 60)).toString()) :
+				ago >= 0        ? '%i18n:common.time.just_now%' :
+				ago <  0        ? '%i18n:common.time.future%' :
+				'%i18n:common.time.unknown%');
+		}
+	},
+	created() {
+		if (this.mode == 'relative' || this.mode == 'detail') {
+			this.tick();
+			this.tickId = setInterval(this.tick, 1000);
+		}
+	},
+	destroyed() {
+		if (this.mode === 'relative' || this.mode === 'detail') {
+			clearInterval(this.tickId);
+		}
+	},
+	methods: {
+		tick() {
+			this.now = new Date();
+		}
+	}
+});
+</script>