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Validation

Returns a boolean indicating whether the Dayjs's date is valid.

• Non-strict check.

  Only checks if the value could be parsed to a Date time.

  dayjs('2022-01-33').isValid();
  // true, parsed to 2022-02-02
  dayjs('some invalid string').isValid();
  // false
  

• Strict check.

  Checks if the value could be parsed to a Date time and it is a valid date. The last two arguments format and strict must be provided.

  This requires the CustomParseFormat plugin to work

  dayjs('2022-02-31', 'YYYY-MM-DD', true).isValid();
  // false