10 examples of 'javascript is valid date' in JavaScript

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function isDateValid(value) {
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    const matched = value.match(dateRe);
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    if (matched) {
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        const epoch = Date.parse(value);
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        if (!epoch && epoch !== 0) return false;
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        const d = new Date(epoch);
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        d.setTime(d.getTime() + d.getTimezoneOffset() * 60 * 1000);
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        if (
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            d.getFullYear() == matched[1] &&
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            d.getMonth() + 1 == +matched[2] &&
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            d.getDate() == +matched[3]
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        ) {
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            return true;
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        }
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    }
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    return false;
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}

1
function isValidDate(value: number | string) {
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  return !Number.isNaN(+new Date(value));
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}

3
function isValid(date){
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	if(date.length !== 6) return false;
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6
	var month = parseInt(date[4] + date[5]);
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	if(month > 12 || month === 0) return false;
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	var today = getToday();
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	if(parseInt(today) - parseInt(date) < 0) return false;
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	return !isNaN(parseInt(date));
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}

15
export function getValidDate(date: unknown): Date {
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  if (typeof date === 'undefined') {
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    throw new Error('expects a date');
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  }
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  date = date || new Date();
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  if (date instanceof Date) {
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    return date;
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  }
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  if (typeof date === 'number') {
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    if (isValidDate(date)) date = new Date(date);
27
  }
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  if (typeof date === 'string') {
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    if (!isValidDate(date)) {
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      date = date.replace(/-/g, '/');
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    }
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    if (isValidDate(date as string)) {
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      date = new Date(date as string);
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    }
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  }
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  return date as Date;
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}

1
export function isValidDate(year: number, month: number, date?: number): boolean {
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  const d = new Date(year, month, date);
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  const dateValid = d.getDate() == date;
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  const monthValid = d.getMonth() == month;
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  const yearValid = d.getFullYear() == year;
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  const valid = dateValid && monthValid && yearValid;
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  return valid;
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}

24
public static isValidDate(year: number, month: number, day: number) { 
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    return (
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        month > 0 && month < 13 &&
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        year && year.toString().length === 4 &&
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        day > 0 &&
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        // Is it a valid day of the month?
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        day <= (new Date(year, month, 0)).getDate()
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    );
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}

106
function dateHandler(date) {
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		var
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      dArray, // 数组化后的日期
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      ret;
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		if (typeof date === 'string') { // 如果date参数是string类型
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			if (rNumberstring.test(date)) { // 如果date参数是number string类型
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        ret = new Date(date);
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			} else { // 这里重新格式化,一般都是从服务端过来的数据,必须有年月日,并且顺序是年月日时分秒毫秒,并且7个值之间有间隔符,间隔符为\D
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				dArray = date.match(rDatestring); // 从string中提取new Date需要的参数
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				if(dArray.length < 3) { // 服务端时间戳,例如NET "/Date(562941040500+0800)/"
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          ret = new Date(+dArray[0]);
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				} else { // 格式化过的
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          ret = new Date(dArray[0], dArray[1] - 1, dArray[2] || 1, dArray[3] || 0, dArray[4] || 0, dArray[5] || 0, dArray[6] || 0);
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				}
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			}
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		} else if (typeof date === 'number' || Object.prototype.toString.call(date) === '[object Date]') { // 如果date参数是number类型、date类型
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      ret = new Date(+date);
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		} else if (date == null) { // 如果不存在date参数
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      ret = new Date();
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		} else {
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      return false;
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    }
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		return ret;
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	}

1
function checkdate (m, d, y) {
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  //  discuss at: http://phpjs.org/functions/checkdate/
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  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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  // improved by: Pyerre
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  // improved by: Theriault
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  //   example 1: checkdate(12, 31, 2000);
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  //   returns 1: true
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  //   example 2: checkdate(2, 29, 2001);
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  //   returns 2: false
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  //   example 3: checkdate(3, 31, 2008);
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  //   returns 3: true
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  //   example 4: checkdate(1, 390, 2000);
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  //   returns 4: false
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  return m > 0 && m < 13 && y > 0 && y < 32768 && d > 0 && d <= (new Date(y, m, 0))
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    .getDate()
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}

115
function validTime (dt) {
116
  if (dt && typeof dt === 'string') {
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    var r = reTime.exec(dt)
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    if (r) {
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      var h = parseInt(r[1])
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      var m = parseInt(r[2])
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      return h >= 0 && h <= 23 && m >= 0 && m <= 59
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    }
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  }
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  return false
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}

49
function isDate(value) {
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    return /\d{2,4}-\d{2}-\d{2}[T -_]\d{2}:\d{2}:\d{2}/.test(value);
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}