Some dates recognized as dates, some dates not recognized. Why?

Question

Here is a list of dates:

04-22-11
12-19-11
11-04-11
12-08-11
09-27-11
09-27-11
04-01-11

When you copy this list in Excel, some of th

Answer 1

Here is what worked for me. I highlighted the column with all my dates. Under the Data tab, I selected 'text to columns' and selected the 'Delimited' box, I hit next and finish. Although it didn't seem like anything changed, Excel now read the column as dates and I was able to sort by dates.