I think "capture date" is the phrase LR uses, assuming I understand what you mean by "date digitized".
Based on this Julianne Kost post (Lightroom Files Can Contain Multiple Dates « Julieanne Kost's Blog), "Date Digitized" is, for scanned images, the date the image was scanned, and "Date Original" is the actual date of the image. By experimentation in LR, I have found that "Capture Time" and "Date" both refer to "Date Original" and not to "Date Digitized". This is good, but what i am missing is the ability to sort by the "Date Digitized" metadata.
Does this make sense?
In the EXIF standard, Date Time Original is when the image was originally captured, i.e. when the shutter was pressed. Date Time Digitized is when an analog image (film) was scanned (digitized); for digital cameras, generally Date Time Digitized is the same as Date Time Original. The field Date Time is supposed to be the last time that software (or firmware) modified the image in any way; LR doesn't properly maintain Date Time.
LR's capture date usually shows the EXIF Date Time Original. (When Date TIme Original is missing, LR tries to use other date fields, but it's buggy and gets confused.)
Thanks! Just what I needed to know!