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People refer to the days of the month as following:
...
Example:
Hoy es primero de enero.
Notice the use of the ordinal number for the day one. Does that mean that you can also use ordinal numbers for the days of the month or is this just an exception for the day one?
Would this be correct?
The use of ordinal numbers in dates is an anglicism. You can use ordinal or cardinal interchangeably.
There are countries that use only cardinal numbers (like Spain I think):
1 (uno) de enero.
In others, we use only the first day of the month as an ordinal:
1º (primero) de marzo
2 (dos) de marzo.
...
I haven't heard of any country that uses only ordinal numbers but it doesn't mean is wrong. It's also perfectly correct to use:
23º (vigésimo tercer día) de junio.
You can found more information on this blog post.
I've never seen or heard of ordinal numbers used for any dates other than the 1st of each month, and then only colloquially. Use cardinal numbers to be safe.
