php – MySQL | How to compare date type

Question: Question:

From the html form submission, I try to compare the value of type = "date" with the date type column in SQL, but I can't extract it.
The source code is as follows.
Is there something wrong with the SQL, PHP, html form description?

<form action="result.php" method="post">
  <input type="date" name="search_date">
  <input type="submit">

$search_date = $_POST["search_date"];
$sql = "select * from sample where event_date = ?";
$stmt = $dbh->prepare($sql);
$stmt->execute($stmt, $search_date);

By the way, can the value of type = "date" be used as the extraction condition for the date type column?

Answer: Answer:

The values ​​submitted by the form are in ISO 8601 format


The date and time are separated by T , and the time zone specification is added at the end.

On the other hand, the format that MySQL can recognize is

  • 15-08-01
  • 2015-08-01
  • 2015-08-01 02:03:04

There are 6 types of convenience of the 3 types of symbol differences and the non-symbol version. So the SQL in question is not recognized as a date, it seems that event_date is converted to a string other than ISO 8601 and then compared to the parameter.

In order to recognize it as a date, PHP should convert it like date('Ym-d', strtotime($_POST["search_date"])) .

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