We had an issue where the clocks on various hosts got offset beyond the margin allowed by an application we were testing.  Here's a way to scan hosts for their clock skew relative to a known good server:

function Get-RemoteTime {
      param (
            [String[]]$computerName = @($env:COMPUTERNAME)
      ) 

      foreach ($computer in $computerName) {
            if (!$computer) { continue; }
            $localTime = Get-Date;
            $time = Get-WmiObject -ComputerName $computer Win32_LocalTime;
            $remoteTime = ("{0}/{1}/{2} {3}:{4}:{5}" -f $time.year, $time.month, $time.day, $time.hour, $time.minute, $time.second) -as [DateTime];
            $skew = [Math]::Abs([int]($localTime - $remoteTime).TotalSeconds);

            $computer | Select-Object @{
                  n = 'Computer';
                  e = { $_; }
            }, @{
                  n = 'LocalTime';
                  e = { $localTime; }
            }, @{
                  n = 'RemoteTime';
                  e = { $remoteTime; }
            }, @{
                  n = 'Skew';
                  e = { $skew; }
            }
      }
}