5 examples of 'display current date and time in html' in JavaScript

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function displayDateContent(startDateTime, endDateTime) {
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  if (endDateTime) {
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    return (
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      `${startDateTime.date} ${startDateTime.monthSym} ${startDateTime.year} - ` +
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      `${endDateTime.date} ${endDateTime.monthSym} ${endDateTime.year}`
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    );
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  }
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  return `${startDateTime.date} ${startDateTime.monthSym} ${startDateTime.year}`;
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}

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function displayDateTime(time) {
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    if (time)
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        return time.replace('T', ' ').replace('.000Z', '');
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    else
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        return time;
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}

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function longdate(date, showtime) {
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	return format_date(date, months, showtime)
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}

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renderDate(pubTime, fromSite) {
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    // 时间差的计算
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    let minute = 1000 * 60;     // 1分钟
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    let hour = minute * 60;     // 1小时
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    let day = hour * 24;        // 1天
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    let week = day * 7;         // 1周
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    let month = day * 30;       // 1个月
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    // 计算时间差
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    let now = new Date().getTime();     // 获取当前时间
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    let diffValue = now - Date.parse(pubTime.replace(/-/gi, "/"));
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    if (diffValue < 0) return;
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    let monthC = diffValue/month;   // 相差了几个月
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    let weekC = diffValue/week;     // 相差几周
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    let dayC = diffValue/day;       // 相差几天
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    let hourC = diffValue/hour;     // 相差几小时
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    let minuteC = diffValue/minute; // 相差几分钟
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    let result;
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    if (monthC >= 1) {
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        result = parseInt(monthC) + "月前";
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    }else if (weekC >= 1) {
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        result = parseInt(weekC) + "周前";
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    }else if (dayC >= 1) {
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        result = parseInt(dayC) + "天前";
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    }else if (hourC >= 1) {
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        result = parseInt(hourC) + "小时前";
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    }else if (minuteC >= 1) {
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        result = parseInt(minuteC) + "分钟前";
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    }else result = "刚刚";
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    return result + ' · ' + fromSite;       // 拼接
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}

157
function makeHTML(tw) {
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	function d2(dig) { return (dig>9?"":"0") + dig }
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	var d = new Date(tw.created_at);
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	d = d.getDate() + "日 " + d.getHours() + ":" + d2(d.getMinutes()) + ":" + d2(d.getSeconds());
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	//ユーザアイコン
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	return (tw.user.url ? '<a target="twitter" href="'+tw.user.url+'">' : '') +
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		'' + (tw.user.url ? '</a>' : '') +
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		//fav
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		'' + 
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		//名前(Twitter本家のリンク)
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		'<a target="twitter" href="http://twitter.com/' + tw.user.screen_name + '">' + tw.user.screen_name +
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		 /*プロフィールの名前*/ (tw.user.name!=tw.user.screen_name ? '('+tw.user.name+')' : '') + '</a>' +
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		 /* protected? */ (tw.user.protected ? '' : '') +
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		//本文クリックで@追加
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		" <span>" +
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		//本文 (https〜をリンクに置換 + @をtwitter本家へのリンクに置換)
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		tw.text.replace(/(https?:\/\/[^ ]*)/g, " <a target="\&quot;_blank\&quot;" href="\&quot;$1\&quot;">$1</a>")
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				.replace(/@([0-9A-Za-z_\-]+)/g, "<a target="\&quot;twitter\&quot;">@$1</a>") + '</span>' +
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		//日付
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		'<span>' + d + '</span>' +
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		//返信元へのリンク
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		(tw.in_reply_to_status_id ? ' <a href="#">☞</a>' : '') +
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		'<br />';
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}