предложенная формулировка отражает реальные условия. на момент расчета справки за текущий период в неё могут быть внесены изменения за прошедшие три месяца.
the proposed wording reflects the real conditions.at the time of calculating the reference for the current period it may be changed in the past three months.
proposed wording reflects the real conditions. at the time of calculation of reference for the current period it may be amended over the past three months.
the proposed wording reflects the real conditions. at the time of calculating the reference. for the current period, it can be changed over the past three months.