使用 javascript 从日期到日期验证

Question

I want to validate from and to date. my date format is d/m/YH:i

Here is my code:

    var startDate = new Date($('#fromdate').val());
    var endDate = new Date($('#todate').val());
    if (endDate.getTime() <= startDate.getTime()) {
        return [false,"To Date cannot be less than From Date"];
    }else{
        return [true,""];
    }

result showing 'Invalid Date'.

Here the date format is different. How to change the date format before passing to Date function?.

Answer 1

You can parse the date string on your own or you can use an external library, like dayjs or momentjs

A simple parsing function could be something like this (assuming the format is the one you mentioned in your question):

function getDateFromCustomFormat(dateString) {
  const dateFormatPattern = /^([0-9]{2})\/([0-9]{2})\/([0-9]{4}) ([0-9]{2}):([0-9]{2})$/

  const parts = dateString.match(dateFormatPattern)
  console.log(parts)

  const validFormatString = `${parts[3]}-${parts[2]}-${parts[1]} ${parts[4]}:${parts[5]}`
  new Date(validFormatString)
}