Setting Up a Harptos Calendar Timeline with Negative and Positive Years in DR Format

I’m trying to create a timeline based on the Harptos calendar from the D&D Forgotten Realms, but in the “Edit Calendar” section under the Eras tab, I can’t figure out how to set the timeline to a standard X-axis. I want the years to run from negative infinity, through 0, and into positive infinity, with each year tagged with “DR.” For example, years like -35,000 DR, 0 DR, and 1500 DR, and so on. How can I set this up?

You cannot have two eras with the same name, so you need to name them e.g. “bDR” or “-DR” and “aDR” or “+DR” respectively. The problem I think is 0 DR, is that really one year long or is it like “our” year zero – it doesn’t exist? The year after 1 BCE is 1 CE, not zero.

I made a quick experiment that seems this would work:
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I created a separate era named 0 DR, although my experiments with making an event end up on that year/era failed. I think I made some mistake somewhere and I also think it is a bad idea to have spaces in the era names due to Aeon’s data parsing; avoid it.