2 answers
Lisa Forstberg
Rising Star 
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Hi @Lisa New ,
Welcome to the community.
Create a filter for the issues you would like to export
Click on the Export issues > Export Excel CSV (all fields)
That would give you to a lot of empty columns but it will also give you every single comment as a column with timestamp and userID.
Like this:
Best of luck
/Lisa
Aron Gombas _Midori_
Community Champion
@Lisa New (I saw you posted this question for the DC, too, but this one is for the Cloud.)
You can use the Better Excel Exporter app to export comments along with other issue fields to a spreadsheet like this:
As you see, comment author, time and text appear in separate columns having the correct data type.
(Discl. this paid and supported app is developed by our team. Free for 10 users!)
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