Groovy get current date yyyymmdd

get date now groovy

import java.text.SimpleDateFormat 
import java.util.Date

Date now = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(now);

int yearNow = calendar.get(Calendar.YEAR)
int monthNow = calendar.get(Calendar.MONTH)
int dayNow = calendar.get(Calendar.DAY_OF_MONTH)