CBSubs Mailer throwing DATETIME parse error

Running the CBSubs Mailer using the automation URL throws this error:
0   Failed to parse time string (DATETIME) at position 0 (D): The timezone could not be found in the database  

Looks like you have a condition configured to compare dates and you're supplying an invalid date. Please review the conditions on your mailer carefully.

Attached a screenshot of the mailer that's been blowing up.
I've been using this value successfully, at least until now...

[cb:date format="PHP_DATE()_FORMAT" date="DATETIME" /]
 

That isn't a valid substitution. You've just copy and pasted the structure example. Below is an example of a working date substitution.

Current Date:
[cb:date format="Y-m-d" /]
Current Date with Time:
[cb:date format="Y-m-d H:i:s" /]

Please be sure to read through the substitution tutorial below carefully as we do provide examples.

www.joomlapolis.com/documentation/127-community-builder/279-tutorials/18353-using-substitutions-throughout-cb

Thanks, Kyle -
FYI the substitution I used DID work earlier, and it was copied directly from the document your referenced above.

Date - display a preformated date based off current date and time
[cb:date format="PHP_DATE()_FORMAT" date="DATETIME" /]

FYI the substitution I used DID work earlier, and it was copied directly from the document your referenced above.

It absolutely could not have. That's not a valid substitution. It will pass invalid values to PHP date function causing an error to throw.

You copy and pasted the syntax. You did not copy and paste the example. The syntax is there to describe how it's used.

format = PHP date() function format
date = valid datetime value (leave empty for it to use current datetime)