UpdateAssemblyVersion.ps1

# source http://stackoverflow.com/questions/36200323/get-and-replace-assemblyversion-from-assemblyinfo-cs

function Update-Version($path, $pattern, $template, $newVersion)
{
	(Get-Content $path) | ForEach-Object{
		if($_ -match $pattern){	
			$fileVersion = [version]$matches[1]
			$now = Get-Date
			$newVersion = "{0}.{1}.{2}.{3}" -f $now.Year, $now.ToString("MMdd"), $now.ToString("HHmm"), ($fileVersion.Revision+1)
			$template -f $newVersion
		} else {
			$_
		}
	} | Set-Content $path
}

$p = "MyProject\Properties\AssemblyInfo.cs"

Update-Version $p '\[assembly: AssemblyVersion\("(.*)"\)\]' '[assembly: AssemblyVersion("{0}")]'
Update-Version $p '\[assembly: AssemblyFileVersion\("(.*)"\)\]' '[assembly: AssemblyFileVersion("{0}")]'