Excel Reformat Dates & Remove Duplicates

I have an Excel workbook where every date needs to appear in the strict ISO style — YYYY-MM-DD. Once the dates are fixed, any row that is an exact duplicate should be completely removed so the file contains only unique records... (Budget: ₹750 - ₹1250 INR, Jobs: Copy Typing, Data Entry, Data Processing, Excel, PDF, Visual Basic, Word)