Adding the date and time to quoted messages in Thunderbird reply e-mails

To add a date and time to the quote of messages you are replying to:

1. Go to Preferences (on a Mac, at least, and this will be under the main Thunderbird menu)
2. Click on the Advanced icon
3. Stay on the General tab and click the Config Editor... button.
4. Search for reply_header_type
5. Double-click the value field of mailnews.reply_header_type, and
6. Change this from 1 (in my case) to 2.

You're done!

This should give you the format "On 2/18/09 10:11 PM, Michael Stoll wrote:" leading off the quoting of e-mails to which you reply.

This was found by trial and error, so there may be a drastically simpler way (or better documentation than this already written), but fortunately it only took one try, and I felt so smart I had to share.

Resolution