PHP Error when creating offer or want

Problem/Motivation

When I try to create an offer or want, I get a white screen and the following PHP Error in the log:

InvalidArgumentException: The timestamp must be numeric. in Drupal\Component\Datetime\DateTimePlus::createFromTimestamp() (line 201 of /var/www/html/okanogantrades/web/core/lib/Drupal/Component/Datetime/DateTimePlus.php).

Steps to reproduce

I wonder if it has anything to do with the MySQL settings I changed.

in MySQL:
set global log_bin_trust_function_creators=1;

I turned log_bin off

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes