java 获取日期的几天前,几个月前和几年前的实例

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;  } }}

String time = DateHelper.getPastTime(Date.from(item.getCreateTime().atZone(ZoneId.systemDefault()).toInstant()));