How to schedule a Rules component at the end of the month? The users on my website can flag articles with Flag. I want them to be able to do this exactly once every month, but they do not have permission to unflag content. Therefore, my plan is to create a Rule that triggers when an article is flagged and that schedules a Rules component that takes care of the unflagging.

How can I schedule this component at the end of the month, i.e. which value should I add in the field Scheduled evaluation date of the action Schedule component evaluation?
Introducing last day of 23:59 works for me (last day of is the last day of the current month, and 23:59 just before the day ends). You can see the full reference of DateTime relative formats here: http://php.net/manual/en/datetime.formats.relative.php

In general, you can pass anything recognised by strtotime() as the scheduling date.