YOU SAID:
my school got cancelled for a month
INTO JAPANESE
私の学校は1ヶ月間キャンセルされました
BACK INTO ENGLISH
My school has been canceled for one month
INTO JAPANESE
私の学校は1か月間キャンセルされました
BACK INTO ENGLISH
My school has been canceled for one month
That didn't even make that much sense in English.