תִּקְע֣וּ בַחֹ֣דֶשׁ שׁוֹפָ֑ר בַּ֝כֵּ֗סֶה לְי֣וֹם חַגֵּֽנוּ׃
你們要在新月之時吹響羊角號，在指定的時日，為我們的節日吹響。
Rashi
on the appointed time The appointed day for it, and so (Prov. 7:20): “on the appointed day (בכסה) he will come home”; to the appointed time that had been fixed.