OP here—It's using Test::More.

Should I even be relying on eval at all? Or should I instead be checking it first, before I send it to DateTime::Format::ISO8601? Handling dates seems extremely complicated, and I don't know what the correct approach is. I'm also not sure where this error will go when running the actual code; if it's just an artifact of testing, I guess I can just comment out the test and not worry about it, if this output is going to vanish into thin air in real use.

In reply to Re^2: Catching error in DateTime::Format by Anonymous Monk
in thread Catching error in DateTime::Format by Anonymous Monk

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