java 获取日期的几天前，几个月前和几年前.
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()));