6 examples of 'js invalid date' in JavaScript

15
export function getValidDate(date: unknown): Date {
16
  if (typeof date === 'undefined') {
17
    throw new Error('expects a date');
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  }
19
20
  date = date || new Date();
21
  if (date instanceof Date) {
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    return date;
23
  }
24
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  if (typeof date === 'number') {
26
    if (isValidDate(date)) date = new Date(date);
27
  }
28
29
  if (typeof date === 'string') {
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    if (!isValidDate(date)) {
31
      date = date.replace(/-/g, '/');
32
    }
33
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    if (isValidDate(date as string)) {
35
      date = new Date(date as string);
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    }
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  }
38
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  return date as Date;
40
}

1
function isValidDate(value: number | string) {
2
  return !Number.isNaN(+new Date(value));
3
}

87
function isDateValid(value) {
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    const matched = value.match(dateRe);
89
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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;
93
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        const d = new Date(epoch);
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        d.setTime(d.getTime() + d.getTimezoneOffset() * 60 * 1000);
96
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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;
107
}

3
function isValid(date){
4
	if(date.length !== 6) return false;
5
	
6
	var month = parseInt(date[4] + date[5]);
7
	if(month > 12 || month === 0) return false;
8
9
	var today = getToday();
10
	if(parseInt(today) - parseInt(date) < 0) return false;
11
12
	return !isNaN(parseInt(date));
13
}

1
export function isValidDate(year: number, month: number, date?: number): boolean {
2
  const d = new Date(year, month, date);
3
4
  const dateValid = d.getDate() == date;
5
  const monthValid = d.getMonth() == month;
6
  const yearValid = d.getFullYear() == year;
7
  const valid = dateValid && monthValid && yearValid;
8
9
  return valid;
10
}

4
export function parseDateString(date, separator = '-') {
5
  // Expects format MM-yyyy by default: no dates
6
  let datePieces = date.split(separator);
7
  if (datePieces.length === 2) {
8
    if (datePieces[0] < 1 || datePieces[0] > 12) {
9
      throw new Error('Not a valid month value');
10
    }
11
    let firstOfMonth = new Date(datePieces[1], datePieces[0] - 1, 1);
12
    if (isValid(firstOfMonth)) {
13
      return firstOfMonth;
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    }
15
  }
16
  // what to return if not valid?
17
  throw new Error(`Please use format MM${separator}yyyy`);
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}