How to manipulate Date in PowerShell?

To add/remove date from the date string you need to use AddDay() method. For example,

We need to add 6 days to the current date.

(Get-Date).AddDays(6)
25 March 2020 22:40:36

To go back to the specific number of days, the same AddDays() method will be used but the numbers are negative.

 For example,

(Get-Date).AddDays(-6)
13 March 2020 22:45:34