Save as draft - DateTime validation error

[i-just]

Description

After updating to Craft 3.5.19 (which contains a fix for #7404 ) whenever I save a draft or try to preview it or view it I get an error ("A server error occurred."). In the logs I can see this:
2021-01-28 15:14:44 [-][1][-][error][ArgumentCountError] ArgumentCountError: Too few arguments to function craft\helpers\DateTimeHelper::toDateTime(), 0 passed in /Library/WebServer/Documents/src/motability/drc/vendor/craftcms/cms/src/validators/DateTimeValidator.php on line 81 and at least 1 expected in vendor/craftcms/cms/src/helpers/DateTimeHelper.php:83

Downgrading to version 3.5.18 solves this problem.

Changing line 81 of vendor/craftcms/cms/src/helpers/DateTimeHelper.php from:
$value = DateTimeHelper::toDateTime();
to
$value = DateTimeHelper::toDateTime($value);
also seems to fix the problem (but I haven't checked any other implications of doing this).

Steps to reproduce

1. update to Craft 3.5.19
2. edit any entry and save it as draft
3. try to view that entry (click on view button)

Additional info

• Craft version: 3.5.19
• PHP version: 7.1.23 and 7.2.34
• Database driver & version: mysql
• Plugins & versions: n/a

[brandonkelly]

Doh, thanks for pointing that out! Just released 3.5.19.1 with the same fix.

[ghost]

• • ****

[michtio]

As a mention, this error also happened when indexing assets through the CLI:

Indexing assets in Videos ...
    > #0: 07-Brief-introduction-to-communities-of-practice.pdf ... error: Too few arguments to function craft\helpers\DateTimeHelper::toDateTime(), 0 passed in /home/forge/researchschool.org.uk/releases/30524f031c5077de5b27a3c325a004a283df7466/vendor/craftcms/cms/src/validators/DateTimeValidator.php on line 81 and at least 1 expected

I think it is related, will update Craft and report back if issue has been resolved.

[brandonkelly]

@michtio Yeah the bug was in DateTimeValidator. 3.5.19.1 will fix that one too.