Using "Create Event" action in Gmail

I am a fan of the integration of Gmail and Google Calendar, but one thing that isn't clearly explained is that you need to put event details in the subject line of your email. Even then the results can be unexpected. I did some light testing of various date strings. Here are some results.

Today is Sunday the 16th of November 2008. You have just learned of a screening of the film "Foo" in the evening and want to forward it to Eddy. Here are a few Subject: lines and their results.

Success
Subject: Foo Screening at 7pm
Subject: Foo Screening: Sunday Nov. 16 - 7pm
A Week Late
Foo Screening: Sunday at 7pm

Month Long Event
Foo Screening - Sunday, November 16 - 7:00pm
Watch out for hyphens in your date. In this case they indicate a date range. Google Calendar appears to have a default of one month for an unfinished date range. The end date is set to December 15 2008.


No Event Detected
Subject: Foo Screening - Sunday, November 16 - 7:00