Groovy script to pick the count of days from today's date

import java.util.concurrent.TimeUnit;

import java.lang.*;

import java.time.*;

import com.sap.gateway.ip.core.customdev.util.Message;

import java.text.SimpleDateFormat;

import java.util.Date;

import java.util.HashMap;


def Message processData(Message message)

{

def map = message.getHeaders();

String getCertExpirydate = map.get("CertExpiryDate");

Date CertExpirydate = new SimpleDateFormat("yyyy-MM-dd").parse(getCertExpirydate);

Date dateNow = new Date(System.currentTimeMillis());

long dateDiff = CertExpirydate.getTime() - dateNow.getTime();

def daysToExpire = TimeUnit.DAYS.convert(dateDiff, TimeUnit.MILLISECONDS);

message.setHeader("daysToExpire",daysToExpire);

return message;

}