Monthly subscription charge in stats

Hi. I know that the monthly subscription price is incorporated in the statistics you see in the ‘monthly returns’ stats screen for any strategy. But is there a way for us to know when the subscription price was actually ‘charged’? Logically I assumed this was on 02/03, 03/03, 04/03 etc for a strategy started on 01/03, but this does not seem to be the case. In the past I would briefly set my subscription price to $0 and look at the difference in the stats to see if the cost was charged already, but now that I have subscribers this is no longer practical. Thanks a lot!

I think the calculation charges the sub every 30.5 days.