Each review must recount a visit that took place ~within~ the last three months.  Reviews older than 3 months will not be posted.  In order to guarantee that it gets promptly approved, you must submit your June review no later than the end of August.

You can take it to the bank that the Dutch gang (TER Support Staff) will count it as "Hmmm, June-July-August, yep, that's three months."

However, if the encounter occurred in the middle or at the very end of June, you theoretically have until the corresponding date in September to submit it, not the end of the month -- but it is highly likely you will face initial opposition in getting it approved if you choose to do so.

Please see link below.