I had a play with the suggestion I made. Unfortunately, it didn't work.
I added two columns:
- #year - Integer
- #yearepoch - a column based on another.
For the #yearepoch, I used the template:
{#year:'cmp($, 0, multiply($, -1), $, $)'} {#year:'cmp($, 0, 'BBY', 'ABY', 'ABY')'}
This gives a display like what was asked for. Unfortunately, the sorting is based on the displayed data, not the value of #year.
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