Question 41608 in PHP Question posted in
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PHP Determine If Monday or Thursday is next from date provided

Is PHP able to determine if a Monday or Thursday comes next and what the date (‘YYYY-MM-DD’) will be if I provide it with a date to start from?

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2

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  1. Chosen as BEST ANSWER
    0

    Calculate the date of the next Monday and Thursday using a given date:

    $start = new DateTimeImmutable('2023-01-08');
$monday = $start->modify("next monday");
$thursday = $start->modify("next thursday");

    Using diff with an if statement display the result

    if ( ($start->diff($monday)->days < $start->diff($thursday)->days ) ) {
    echo "monday";
} else {
    echo "thursday";
}

  2. 0

    Next monday or thursday is the smaller of the two. If DateTime is used instead of DateTimeImmutable, copies (clone) from $start must be used.

    $start = new DateTime('2022-11-19');
$nextMondayOrThursday = Min(
  (clone $start)->modify("next monday"),
  (clone $start)->modify("next thursday")
);

echo $nextMondayOrThursday->format('l, d F Y');
//Monday, 21 November 2022

    Try self: https://3v4l.org/Y5sE5

    A solution that specifies the short form of the days of the week in an array offers more flexibility. In this way, 3 or more days of the week can also be specified.

    $start = date_create('2022-11-20');
$next = ['Mon','Thu','Fri'];

while(!in_array($start->modify('+1 Day')->format('D'),$next));

echo $start->format('l, d F Y');

    It is recommended to ensure that the while loop does not run indefinitely by validating $next.

    Future times such as next Monday or next Thursday can also be conveniently encoded as a string using cron syntax. For Monday or Thursday 00:00 the string is:

    '0 0 * * 1,4'

    The days of the week are written as digits from 0 for Sunday to 6 for Saturday. A big advantage is that these strings can easily be stored anywhere like in a database. There are a number of solutions to implement it in PHP (e.g. cron-expression). Just an example using the JspitDt class:

    use JspitDt;

$cron = '0 0 * * 1,4'; 
$date = Dt::create('2022-11-21')->NextCron($cron);
//"2022-11-24 00:00:00.000000"
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