9 examples of 'javascript date yyyy mm dd' in JavaScript

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export function yyyymmdd(date) {
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	date = date || new Date()
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	return date.getFullYear() +
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		pad2(date.getMonth() + 1) +
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		pad2(date.getDate())
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}

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function dateToYYYYMMDD (date) {
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  if (date instanceof Date) {
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    return [
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      date.getFullYear(),
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      String(date.getMonth() + 1).padStart(2, 0),
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      String(date.getDate()).padStart(2, 0),
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    ].join("");
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  }
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  // TODO: better checking here?
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  return date;
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}

8
static formatDateYYYYMMDD(date) {
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  return DateFormatter.format(date, "yyyy-MM-dd");
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}

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export function yyyymmddhhmmss(date) {
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	date = date || new Date()
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	return yyyymmdd(date) +
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		pad2(date.getHours()) +
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		pad2(date.getMinutes()) +
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		pad2(date.getSeconds())
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}

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export default function yyyyMMdd(validDate) {
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	let date;
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	if (!validDate) {
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		return "";
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	} else if (isyyyyMMdd(validDate)) {
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		date = validDate;
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	} else {
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		date = validDate.toISOString();
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	}
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	return date.slice(0, 10);
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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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}

17
function formatDate(d) {
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  function addZero(n) {
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    return n < 10 ? '0' + n : '' + n;
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  }
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  return d.getFullYear() + "-" + addZero(d.getMonth()+1)
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    + "-" + addZero(d.getDate()) + " " + addZero(d.getHours())
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    + ":" + addZero(d.getMinutes()) + ":" + addZero(d.getSeconds());
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}

11
format (fmt = 'yyyy-MM-dd HH:mm:ss') {
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  const obj = {
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    'y+': this.date.getFullYear(),
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    'M{2}': this._paddingZero(this.date.getMonth() + 1),
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    'd{2}': this._paddingZero(this.date.getDate()),
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    'H{2}': this._paddingZero(this.date.getHours()),
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    'h{2}': this._paddingZero(this.date.getHours() % 12),
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    'm{2}': this._paddingZero(this.date.getMinutes()),
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    's{2}': this._paddingZero(this.date.getSeconds()),
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    'M': this.date.getMonth() + 1,
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    'd': this.date.getDate(),
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    'H': this.date.getHours(),
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    'h': this.date.getHours() % 12,
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    'm': this.date.getMinutes(),
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    's': this.date.getSeconds(),
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    'W': this.date.getDay()
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  }
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  for (let [key, ] of Object.entries(obj)) {
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    const regexp = new RegExp(`(${key})([^a-zA-Z])?`)
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    if (regexp.test(fmt)) {
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      fmt = fmt.replace(RegExp.$1, obj[key])
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    }
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  }
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  return fmt
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}

180
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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}