Listview calculate age

OK, let's move on a bit. We have the manufacture_month per vehicle. So we can calculate the age.

This is just some PHP DateTime calculation, nothing fancy:

// calculation of age (today - month of manufacture)
$manufacturemonth = $this->getProperty('manufacture_month'); // DateProperty object
$manufacturemonth_year_month = $manufacturemonth->getValue(); // "2026-01"
$temp = new DateTime($manufacturemonth_year_month); // DateTime object. Let's take the 1st or that month.
$today = new \Datetime(); // DateTime object / today by default
$diff = $today->diff($temp); // calculate the difference between manu-date and today

// for leasing contracts we usually calculate months like 48.
$diff_months = $diff->y * 12 + $diff->m; // let's forget about the days. We don't even know exact manuf-date, only month.

let me put this code into our getLabelHtml() function for now:

public function getLabelHtml(): string
{
    // calculation of age (today - month of manufacture)
    $manufacturemonth = $this->getProperty('manufacture_month'); // DateProperty object
    $manufacturemonth_year_month = $manufacturemonth->getValue(); // "2026-01"
    $temp = new DateTime($manufacturemonth_year_month); // DateTime object. Let's take the 1st or that month.
    $today = new \Datetime(); // DateTime object / today by default
    $diff = $today->diff($temp); // calculate the difference between manu-date and today

    // for leasing contracts we usually calculate months like 48.
    $diff_months = $diff->y * 12 + $diff->m; // let's forget about the days. We don't even know exact manuf-date, only month.

    // gather our data
    $model = $this->getProperty('model');
    $month = $this->getProperty('manufacture_month');
    $details = [
        $model?->toDisplayValue(),
        $month?->toDisplayValue(),
        $diff_months > 0 ? ($diff_months . " months") : null, // skip brand new ones
    ];
    $details = array_filter($details);// remove empty entries

    // create a tile
    \System\UI\Output::use(); // important for autoloading
    $tile = new \System\UI\Output\Elements\Tile('car', $this->licenseplate);
    if ($details)
        $tile->subtitle = implode(' &bull; ', $details);
    return $tile;
}

See how we just add the age to our $details-array in line 19. If this vehicle is at least one month old, we add the age. If not, that line will be filtered out by array_filter()-function in line 21.

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Let's change the manufacture date to see what's happening:

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After saving, we can see the changes:

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New value was saved
Age calculated correctly
Change was recorded in Audit Trail (history timeline)

Listview calculate age

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