Hi Sanna
Ok I have some good and bad news for you.
I’ve tracked down the issue, but I don’t know whats causing it (and its not S&F).
I’ll try to explain a little:
To detect when a new post is created we use the WP action save_post –
add_action( 'save_post', 'post_saved', 10000 );
I’ve added this to the bottom of your functions.php.
Then inside this function, we can use get_post_meta to retrieve the value of your date (S&F needs to do this to be able to store this info).
The problem is, using get_post_meta($post_id, 'datum', true); is failing (returning nothing, like it doesn’t yet exist), but ONLY when you create / update a post from the frontend, and only when you have a load of posts in your database.
When you add a new report via admin, the save_post is triggered, but the date variable is there.
When you do it on a site with a low number of posts, its also there.
Its just in this circumstance using save_post and get_post_meta does not work.
Where to go from here?
I think its a good idea to get in touch with your host, because of the number of posts looking like its an issue, then it could be server related.
If that doesn’t work, I would get in touch with ACF, and ask why get_post_meta doesn’t return anything in the save_post action.
Once you can get this working in your setup, then S&F can also detect this data, and use it properly.
A quick way to test this yourself:
1) I’ve added code to the bottom of your functions.php which logs every save_post on your site, with the date and post ID.
2) All save info is being logged to wp-content/debug.log
3) To test this, open wp-content/debug.log, empty the file and save it (and upload the blank file back to the server) – this is just to clear the log and make it more readable.
4) Now goto your frontend form, and create a new report.
5) Download a new copy of debug.log and check it, you will find a line like:
[02-Mar-2017 20:32:02 UTC] Post saved, ID: 3761, meta date:
Notice, there is no meta date.
6) Goto admin, and create a new report, check debug.log again (make sure to grab a fresh copy), you will see a line like:
[02-Mar-2017 20:36:06 UTC] Post saved, ID: 3764, meta date: 20170312
Notice how this time the post has the date with it.
For some reason when you had only a few posts, beheviour was the same a step (6), but now with many posts its doing step (5).
I hope that helps!
