Mine (DH's also) has been reporting every month for the last eight month (unlike others who report random reporting) and it is always reporting the last business day of the month.
As far as my experience goes with Orchard.
THey will report the balance on the last business day of the month.
THe only way for them to report on a different day is if your New Balance after a payment is higher than the Balance they last reported.
what happened to me is.
i payed on the 27th of the month and made the balance 10 dollars.
then i paid on the 4th, 1 week later and after payment the balance was 187.00... i paid 150 so i wouldnt go over the limit..
so the 1st of the month they reported the 10 dollar balance... then again on the 5th or 6th i forget which they re-reported with a 187 balance.. 1 week later i PIF and they did not updated the 0 balance... just their way of saying EPH U i guess i still love em cause no one else will give me a card yet lol