Field Value Comparison when using relative dates doesn't work

If you enter a relative date for a field value comparison (e.g. yesterday, -5 days), the condition doesn't work properly. It turns out that the date is being converted here to Y-m-d, while the value that is being compared is in YmdHis, so of course comparing these as strings does not work.

Changing that line to YmdHis fixes the problem. Tested with contribution receive date and activity date. Is there any reason to suspect this might not work elsewhere?

I believe #105 (closed) is the same issue.