Java tutorial
//package com.java2s; import java.util.Calendar; import java.util.Date; public class Main { /** * Get relativy days base on today, will return negative and positive * values. * * @param d * @return */ public static long getRelativeDays(Date d) { Calendar c = Calendar.getInstance(); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); c.set(Calendar.MILLISECOND, 0); long curMilli = c.getTimeInMillis(); c.setTimeInMillis(d.getTime()); c.set(Calendar.HOUR_OF_DAY, 0); c.set(Calendar.MINUTE, 0); c.set(Calendar.SECOND, 0); c.set(Calendar.MILLISECOND, 0); long dMilli = c.getTimeInMillis(); return (dMilli - curMilli) / (1 * 24 * 3600 * 1000); } }