Process WorkFlow Tasks not running

Hi All,

I have suitecrm installed on Ubuntu 16.04, mit Apache 2.2, Php 7. My WorkFlow is running inconsistently. The Process Workflow tasks shows that the Workflow has never run althought it did. It looks like when I put the date as operator in the condition section, the workflow trigger does not function at all. I have tried to make sure that my database and Apache have the same date format as suitecrm but I still the same problem. I configured the cron with cron-tab and I followed the instructions from this forum but I have no means to see if my cron is running or not ??? Please if there is anyone in this community who had the same challenges as mine, would you be kind to share info on how to solve this issue. I have attached my log file for your info.