JavaScript?? ?? ?? "mm/dd/yyyy" ??? ??

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??? ????? ???. ?? ?? ???? "mm/dd/yyyy"???. ??? ??? ?? ?? ??? ? ??? ????? ???? ?????.

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??? ?? ?? ??? ???? ??? ??????

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??? ??? "mm/dd/yyyy" ??? ??? ?? ???? ???? ???? ?? ??? ???. ??? ?? ??? ??? ???? ???? ??? ?? ?? ??? ???? ?? ? ????. ??? ???? ???? ??? ??? ?????.

<code class="js">function isDate(ExpiryDate) {
  var objDate, // date object initialized from the ExpiryDate string
    mSeconds, // ExpiryDate in milliseconds
    day, // day
    month, // month
    year; // year
  // date length should be 10 characters (no more no less)
  if (ExpiryDate.length !== 10) {
    return false;
  }
  // third and sixth character should be '/'
  if (ExpiryDate.substring(2, 3) !== '/' || ExpiryDate.substring(5, 6) !== '/') {
    return false;
  }
  // extract month, day and year from the ExpiryDate (expected format is mm/dd/yyyy)
  // subtraction will cast variables to integer implicitly (needed
  // for !== comparing)
  month = ExpiryDate.substring(0, 2) - 1; // because months in JS start from 0
  day = ExpiryDate.substring(3, 5) - 0;
  year = ExpiryDate.substring(6, 10) - 0;
  // test year range
  if (year < 1000 || year > 3000) {
    return false;
  }
  // convert ExpiryDate to milliseconds
  mSeconds = new Date(year, month, day).getTime();
  // initialize Date() object from calculated milliseconds
  objDate = new Date();
  objDate.setTime(mSeconds);
  // compare input date and parts from Date() object
  // if difference exists then date isn't valid
  if (
    objDate.getFullYear() !== year ||
    objDate.getMonth() !== month ||
    objDate.getDate() !== day
  ) {
    return false;
  }
  // otherwise return true
  return true;
}</code>

? ???? ??? ? ?? ?? ? ??? ?? Month = ExpiryDate.substring(0, 2) - 1? ????? ???? ????. ??? ??? 1? ???. ??? ?? ??? ? ?? ??? ? ????. ?? ????? ?? Month =parseInt(ExpiryDate.substring(0, 2), 10) - 1? ???? ???.

?? ??? ? ?? ???? ??? ????. ??? ??? 1000~3000 ??? ???? ????? 2?? ??(?: "19" ?? "20") ???? ???? ????. 2?? ? 4?? ??? ?? ????? ?? ?? ? ??? ?? ??? ??? ?? ??? ? ????.

<code class="js">// extract year
if (ExpiryDate.substring(6, 7) === '/') {
  year = parseInt(ExpiryDate.substring(6, 8), 10); // 2-digit year
} else {
  year = parseInt(ExpiryDate.substring(6, 10), 10); // 4-digit year
}
// test year range
if (year < 1000 || year > 2999) {
  return false;
}</code>

?? ??? ?? "mm/dd/yyyy" ??? ??? ??? ?????. ???? ?????. ? ? ???? ??? ?? ??? ??? ?????(?: ??? ??? ?? ?? ??) ?? ?? ??? ???? ???.

? ??? JavaScript ?? ?? ??? \'mm/dd/yyyy\' ??? ???? ???? ??? ??? ??????? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!