Performing Date Arithmetic

The New-TimeSpan cmdlet provides a way to do date arithmetic within Windows PowerShell. For example, this command tells you the number of days between today’s date and New Year’s Eve 2016:
[crayon-6a6195f3e1288716681548/] 
When this command was run on Dic 2, 2016 we got back the following:
[crayon-6a6195f3e128f606966987/] 
Note. All those who knew that there were 65664000000 milliseconds between Dic 2, 2014 and December 31, 2016 please raise your hands.
To use New-TimeSpan you just need to pass it a pair of date-time values. The best way to do that is to use the Get-Date method; that helps ensure that you get a pair of date-time objects that New-TimeSpan can work with. For our first date, we simply use the Get-Date cmdlet without any additional parameters (note that the cmdlet must be enclosed in parentheses):
[crayon-6a6195f3e1292506122202/] 
For our second date we also call Get-Date, but we tacked on the -month, -day, and -year parameters, along with the appropriate values:
[crayon-6a6195f3e1294213377868/] 
What if you need to know how long it is until a more specific time, such as 11:30 PM on December 31st? As usual, no problem: just include the -hour and the -minute parameters along with the appropriate values (for the hours, use the 24-hour time format). In other words:
[crayon-6a6195f3e1296505202319/]