Answer In short:
You can use https://www.freelancer.com/api/projects/0.1/projects/active/ without using the sort_field
because it is also sorted in recent post by default
Explanation
I tested the API and I found that this is also sorted recent posted date for submitted date
According to Freelancer's Documentation:
Sorting field, by default searches by score, otherwise most recently posted.
I try to limit the result to 3 and reverse it using reverse_sort
to test if it's actually working.
https://www.freelancer.com/api/projects/0.1/projects/active/?limit=3&reverse_sort=true
$requestUrl = "https://www.freelancer.com/api/projects/0.1/projects/active/?limit=3&reverse_sort=true";
$response = json_decode(file_get_contents($requestUrl), 1);
echo "<pre>";
var_dump($response);
Here is the result.
Search for ["submitdate"]
by pressing CRTL + F and get the value.
Paste the value here to convert the equivalent date
Here is the result of reverse_sort converted date
Wed Sep 03 2014 21:14:19 GMT+0800
Tue Jul 14 2015 23:11:36 GMT+0800
Fri Jul 24 2015 05:46:41 GMT+0800
If we remove the reverse_sort=true here is the result
Fri Dec 29 2017 12:45:13 GMT+0800
Fri Dec 29 2017 12:44:49 GMT+0800
Fri Dec 29 2017 12:44:29 GMT+0800
As you can see it is sort by recent posted date