Was hoping to make a focus only be available after a certain time.

Of which, I was wondering what part of the focus editor would i put the factor, and which factor it'd be in. 

It would go in the "Available" box, and would look like so:


This means the focus will only be available when it 01/Jan/1937, or later. The format for dates is YYYY.MM.DD

Thank you, I'll add that whenever I can