java 获取日期的几天前,几个月前和几年前的实例

实例如下：

package bys.utils;

import java.util.date;

/**
 * created by toutou on 2015/3/23.
 */
public class datehelper {

 public static final long one_minute = 60000l;
 public static final long one_hour = 3600000l;
 public static final long one_day = 86400000l;
 public static final long one_week = 604800000l;
 private static final string one_second_ago = "秒前";
 private static final string one_minute_ago = "分钟前";
 private static final string one_hour_ago = "小时前";
 private static final string one_day_ago = "天前";
 private static final string one_month_ago = "月前";
 private static final string one_year_ago = "年前";

 private static long toseconds(long date) {
  return date / 1000l;
 }

 private static long tominutes(long date) {
  return toseconds(date) / 60l;
 }

 private static long tohours(long date) {
  return tominutes(date) / 60l;
 }

 private static long todays(long date) {
  return tohours(date) / 24l;
 }

 private static long tomonths(long date) {
  return todays(date) / 30l;
 }

 private static long toyears(long date) {
  return tomonths(date) / 365l;
 }

 public static string getpasttime(date date) {
  long delta = new date().gettime() - date.gettime();
  if (delta < 1l * one_minute) {
   long seconds = toseconds(delta);
   return (seconds <= 0 ? 1 : seconds) + one_second_ago;
  }
  if (delta < 45l * one_minute) {
   long minutes = tominutes(delta);
   return (minutes <= 0 ? 1 : minutes) + one_minute_ago;
  }
  if (delta < 24l * one_hour) {
   long hours = tohours(delta);
   return (hours <= 0 ? 1 : hours) + one_hour_ago;
  }
  if (delta < 48l * one_hour) {
   return "昨天";
  }
  if (delta < 30l * one_day) {
   long days = todays(delta);
   return (days <= 0 ? 1 : days) + one_day_ago;
  }
  if (delta < 12l * 4l * one_week) {
   long months = tomonths(delta);
   return (months <= 0 ? 1 : months) + one_month_ago;
  } else {
   long years = toyears(delta);
   return (years <= 0 ? 1 : years) + one_year_ago;
  }
 }
}

调用示例：

string time = datehelper.getpasttime(date.from(item.getcreatetime().atzone(zoneid.systemdefault()).toinstant()));

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