"the twenty-fourth day of the seventh month" This is near the middle of October on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-ordinal]])
This was in order to show how sorry they were for the wrong things they and their ancestors had done. (See: [[rc://en/ta/man/translate/figs-explicit]])