grammar - How to use Ordinals with Numeric Date Ranges

Given a numeric date range, such as shown below, which is the correct usage of ordinals? Should I use none, one, or two?

The event dates will be Dec 1-5
The event dates will be Dec 1-5th
The event dates will be Dec 1st-5th

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Potentially Relevant:

• This is going on a document that has single dates, which are represented with ordinals (e.g. Dec 7th)


• The document has limited space, so using through is not an option. Furthermore, I'm not looking for alternatives, I just want to know which one is correct.

Answer

According to "Grammar Girl"

When you're writing out a date like January 1, 2016 (in the American style), the day is written as a cardinal number. So you should never write January 1st, 2016. The weird thing though is when you're speaking, even though it is written as January 1, you say, “January first” (1). So when you are reading a date that is written January 1, 2016, you say “January first, two thousand sixteen.” That's probably why a lot of people get confused about how to write it.

According to which we should write dates as cardinal number and speak dates as ordinal numbers. This suggests that Dec 1-5 is the correct choice.