My PowerShell profile

Microsoft.PowerShell_profile.ps1

function prompt {
	function Get-LastCmdTime {
		$diffPromptTime = $null 
		$lastCmd = Get-History -Count 1
		if ($lastCmd -ne $null) {
			$diff = $lastCmd.EndExecutionTime - $lastCmd.StartExecutionTime
			$msfractional = $diff.TotalMilliseconds - [Math]::Truncate($diff.TotalMilliseconds)
			$ms = $msfractional + $diff.Milliseconds
			if ($diff.Hours) {'{0}h:{1}m:{2}s:{3:N2}ms' -f $diff.Hours,$diff.Minutes,$diff.Seconds,$ms}
			elseif ($diff.Minutes) {'{0}m:{1}s:{2:N2}ms' -f $diff.Minutes,$diff.Seconds,$ms}
			elseif ($diff.Seconds) {'{0}s:{1:N2}ms' -f $diff.Seconds,$ms}
			else {'{0:N2}ms' -f $diff.TotalMilliseconds}
		}
	}
	$admin = ( ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]'Administrator') )
	$shellprompt = if ($admin) {'PS$>'} else {'PS#>'} 
	$lastCmd = Get-LastCmdTime
	$lastCmd = if ($lastCmd) {"[$lastCmd] "} else {''}
	write-host "`n$lastCmd$($executionContext.SessionState.Path.CurrentLocation)" -ForegroundColor DarkCyan
	write-host $shellprompt -NoNewline
	return " "
}

Set-PSReadLineOption -AddToHistoryHandler {
    param([string]$line)
    return $line.Length -gt 3 -and $line[0] -ne ' ' -and $line[-1] -ne ';'
}

if ($psVersionTable.PSVersion.Major -eq 5) {
	$OutputEncoding = [console]::InputEncoding = [console]::OutputEncoding = [System.Text.UTF8Encoding]::new()
}