$collection->sortBy('date',...) strtotime date first

I wonder what’s a good way to do that. I have a collection which has mixed date formatting and I want to sort them by date, however they are not in the correct order, and i wondered how i could just sort them by unix timestamp. such as first converting the date field, then just that sort ASC

I already tried several attempts in doing so but it failed and was kinda messy, so maybe there’s a function i didn’t think of by now and i am happy to hear!

Have a look at the map function: https://getkirby.com/docs/cheatsheet/pages/map

is this possible w/o updating content but just modifying output?

Yes, you don’t have to update the content but can use it as kind of virtual field.

	function changeUnix($page)  {
					'unix' => strtotime($page->datum())
			} catch (Exception $e) {
				echo $e->getMessage();

map() helped me, instead of fiddeling with virtual stuff, i chose to just rewrite a value when the field is not existent already, guess that should do. the sorting is working now.

Here a version without creating a new field:

  $collection = page('somepage')->children()->visible()->map(function($page) {
    $page->timestampfield = strtotime($page->date());
    return $page;
  })->sortBy('timestampfield', 'desc');