Home How do I convert a string into a DateTime without overwriting it OR modify the string without having to convert it?

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How do I convert a string into a DateTime without overwriting it OR modify the string without having to convert it?

byMR

September 30, 2022

So I’m trying to make the code echo the date for the last saturday of february of the chosen year, but the method I attempted using completely overwrote the value of the string. I need the string to keep its value but still modify it into telling me the last saturday of february.

Heres the code:

´´´
<?php

$valdatum = date ("y-m-d H:i T", 0);

if(isset($_POST["valdatum"])) {
    $valdatum=filter_input(INPUT_POST, 'valdatum', FILTER_SANITIZE_SPECIAL_CHARS);
}
?>
<!DOCTYPE html>
<html lang="sv">
    <head>
        <title>Tjejvasan</title>
        <meta charset="utf-8">
    </head>
    <body>
        <form method="POST">
            <input type="date" name="valdatum" value="<?= $valdatum;?>">
            <input type="submit" value="Skicka">
        </form>
    <?php
    echo $valdatum;
    echo "<br>";
    $valdatum = new DateTime;
    $valdatum->modify('last saturday of february');
    $valdatum2 = $valdatum->format('Y-m-d');
    echo $valdatum2;
    ?>
    </body>
</html>

´´´

>Solution :

You seem to have tied yourself in a few knots. I think this is what you need, although your description is not 100% clear:

if(isset($_POST["valdatum"])) {
    //use the date value submitted from the form
    $valdatum = $_POST["valdatum"];
}
else
{
  //use today's date when nothing else was submitted
  $valdatum = date("y-m-d");
}
?>
<!DOCTYPE html>
<html lang="sv">
    <head>
        <title>Tjejvasan</title>
        <meta charset="utf-8">
    </head>
    <body>
        <form method="POST">
            <input type="date" name="valdatum" value="<?= $valdatum;?>">
            <input type="submit" value="Skicka">
        </form>
    <?php
    //change the date to the last saturday in February of the same year
    $febDate = new DateTime($valdatum);
    $febDate->modify('last saturday of february');
    echo $febDate->format('Y-m-d');
    echo "<br>";
    ?>
    </body>
</html>