Subtract or Add Days, Months or Year to Dates with Custom Date Pattern using PowerShell Script

I will share a simple trick for adding days or months to dates and the result will be a custom date pattern. Check the script below… 

Read and Get Values from Excel File using PowerShell Script

What do I use to read data or values from excel file?  And what if I want to read every row on multiple columns? Example data is like this....