Excel won't import ISO 8601 timestamps either, which is crazy these days where it's the universal standard, and there's no excuse to use anything else.
You have to replace the "T" separator with a space and also any trailing "Z" UTC suffix (and I think any other timezone/offset as well?) for Excel to be able to parse as a time/date.
Have you tried using the "from text/csv" importer under the data tab? Where it will import your data into a table. Because that one will import ISO 8601 timestamps just fine.
