But usually I know what the month is. Pre-qualifying a unit number with the "type" makes sense because I don't necessarily know what the number refers to advanc

But usually I know what the month is. Pre-qualifying a unit number with the "type" makes sense because I don't necessarily know what the number refers to advance. And sure, just for grammatical consistency and flow it's fine to say the month before the day. But it's another story in writing, especially on forms, or even worse, in data sets.