I solved my own problem! Here's how I did it:
(If dates are in a row, select row, copy, paste/ transpose to a new column [no header])
- Select the column.
- Choose Data tab
- Text to Columns - opens new box
- (Choose Delimited), Next
- (uncheck all boxes, use "none" for text qualifier), Next
- Use the ymd option from the Date dropdown.
- Click Finish.