Set-Date

Change the computer system time.

Syntax
      Set-Date { [-date] DateTime] | [-adjust] TimeSpan }
           [-displayHint {Date | Time | DateTime}]
              [-whatIf] [-confirm]  [CommonParameters]

Key
   -Date DateTime
       Change the date and time to DateTime.
       Pass a Date-Time object from Get-Date or enter a date in  
       the short date format for your locale. 
        
       The time will default to midnight on the specified date.
       If you specify only a time, the date will not be changed.

   -Adjust TimeSpan
       Add or subtract TimeSpan from the current date and time. 
       Use the standard date and time format for your locale
       or pass a TimeSpan object from New-TimeSpan.

   -DisplayHint DisplayHintType
       Display only the Date, only the Time or the DateTime.
	    This does not affect the DateTime object that is retrieved.

   -WhatIf
       Describe what would happen if you executed the command without
       actually executing the command.
	   
   -Confirm
       Prompt for confirmation before executing the command.

   CommonParameters:
       -Verbose, -Debug, -ErrorAction, -ErrorVariable, -WarningAction, -WarningVariable,
       -OutBuffer -OutVariable.

Examples

Add two days to the current system date, without changing the time:

PS C:\> Set-Date -Date (Get-Date).AddDays(2)

Set the current system time back by 30 minutes:

PS C:\> set-date -adjust -0:30:0

Advance the system time on the local computer forwards by 30 minutes:

PS C:\> $halfhr = new-timespan -minutes 30
PS C:\> set-date -adjust $halfhr

“I always play women I would date” ~ Angelina Jolie

Related:

Get-Date - Get current date and time
New-Timespan - Create a timespan object
Equivalent bash command: date - Display or change the date


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