10 examples of 'change date format in jquery dd mm yyyy' in JavaScript

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function dateFormatter(date, settings) {
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    var day, month, year;
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    if (!date) {
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        return '';
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    }
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    day = date.getDate();
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    month = date.getMonth() + 1;
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    year = date.getFullYear();
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    return year + '-' + month + '-' + day;
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}

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function dateFormat(d) {
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  let month = d.getMonth() + 1;
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  let date = d.getDate();
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  if (month < 10) month = `0${month}`;
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  if (date < 10) date = `0${date}`;
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  return `${d.getFullYear()}-${month}-${date}`;
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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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export function dateFormat(timestamp, format = 'yyyy-MM-dd hh:mm:ss') {
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  timestamp = timestamp.length === 13 ? timestamp : timestamp * 1000
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  let date = new Date(timestamp)
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  let args = {
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    'M+': date.getMonth() + 1,
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    'd+': date.getDate(),
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    'h+': date.getHours(),
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    'm+': date.getMinutes(),
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    's+': date.getSeconds()
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  }
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  if (/(y+)/.test(format)) {
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    format = format.replace(
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      RegExp.$1,
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      (date.getFullYear() + '').substr(4 - RegExp.$1.length)
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    )
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  }
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  for (var i in args) {
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    let n = args[i]
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    if (new RegExp('(' + i + ')').test(format)) {
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      format = format.replace(
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        RegExp.$1,
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        RegExp.$1.length === 1 ? n : ('00' + n).substr(('' + n).length)
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      )
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    }
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  }
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  return format
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}

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function formatDate(date) {
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    const splitDate = date.split('T');
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    if (splitDate[0]) {
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        return splitDate[0];
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    }
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    return date;
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}

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function formatDate(date, fmt) { //author: meizz 
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    var o = {
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        "M+": date.getMonth() + 1, //月份 
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        "d+": date.getDate() //日 
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    };
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    if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (date.getFullYear() + "").substr(4 - RegExp.$1.length));
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    for (var k in o) {
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        if (new RegExp("(" + k + ")").test(fmt))
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            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
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    }
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    return fmt;
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}

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function getDate(strDate) {
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  /* istanbul ignore next */
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  return moment(strDate).format('YYYY-MM-DD')
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}

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export function formatDateTime(date: DateTime, format: string) {
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    return format.replace(regExp, (m: string): string => {
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        return formatters[m](date) as string;
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    });
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}

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formatDate(d) {
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  const calendar = this;
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  const date = new Date(d);
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  const year = date.getFullYear();
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  const month = date.getMonth();
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  const month1 = month + 1;
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  const day = date.getDate();
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  const weekDay = date.getDay();
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  const { monthNames, monthNamesShort, dayNames, dayNamesShort } = calendar;
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  const { dateFormat, locale } = calendar.params;
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  if (typeof dateFormat === 'string') {
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    return dateFormat
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      .replace(/yyyy/g, year)
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      .replace(/yy/g, String(year).substring(2))
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      .replace(/mm/g, month1 < 10 ? `0${month1}` : month1)
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      .replace(/m(\W+)/g, `${month1}$1`)
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      .replace(/MM/g, monthNames[month])
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      .replace(/M(\W+)/g, `${monthNamesShort[month]}$1`)
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      .replace(/dd/g, day < 10 ? `0${day}` : day)
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      .replace(/d(\W+)/g, `${day}$1`)
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      .replace(/DD/g, dayNames[weekDay])
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      .replace(/D(\W+)/g, `${dayNamesShort[weekDay]}$1`);
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  }
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  if (typeof dateFormat === 'function') {
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    return dateFormat(date);
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  }
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  // Intl Object
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  const formatter = new Intl.DateTimeFormat(locale, dateFormat);
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  return formatter.format(date);
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}

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function convertDate(date) {
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    var month = date.getMonth() + 1;
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    var day = date.getDate();
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    var hour = date.getHours();
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    var minute = date.getMinutes();
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    return date.getFullYear() + '-' + (('' + month).length < 2 ? '0' : '') + month + '-' +
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           (('' + day).length < 2 ? '0' : '') + day + " " + (('' + hour).length < 2 ? '0' : '') +
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           hour + ":" + (('' + minute).length < 2 ? '0' : '') + minute;
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}