After signing up to the Ylastic service (ylastic.com) which provides a unified interface to manage your Amazon Web Services cloud environment, I started to struggle with the simple task of creating scheduled tasks using CRON expressions.
From the initial configuration, it would appear that Ylastic does not support using special characters other than the asterisk. Now that was not the issue I was running into, once the scheduled task was created it would appear to be invoked as configured using the CRON expression.
After a little bit of head scratching the Ylastic service only supports the Eastern Time zone, and does not take into consideration the time zone you configure for your account. So when creating your scheduled tasks you will need to configure scheduled times in Eastern Time zone format, so in my case I got used to adjusting the time zone (-05:00) when creating my tasks.