To change the formatting from Text to Date, use Text to Columns technique:
1. Select the column formatted as text.
2. From the Data menu, select Text to Columns.
3. In Step 1 of 3, select the Fixed width option button.
4. Skip Step 2 of 3.
5. In Step 3 of 3, check Date option button in Column data format, and click Finish.
Screenshot // Problem: Date Formatting Cannot Be Changed
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