Java时间工具类DateUtils（把日期时间转换成xx秒前、xx分钟前、xx小时前...）

java中给定时间字符串，转换为距离现在几分钟，几天，几周前

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</span><span style="font-size:14px;">import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class DateUtils {

private static final long ONE_MINUTE = 60;

private static final long ONE_HOUR = 3600;

private static final long ONE_DAY = 86400;

private static final long ONE_MONTH = 2592000;

private static final long ONE_YEAR = 31104000;

public static Calendar calendar = Calendar.getInstance();

/**

*

* @param timestr

* @return 距离现在

*/

public static String fromToday(String timestr){

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

Date date = null;

try {

date = df.parse(timestr);

} catch (ParseException e) {

e.printStackTrace();

return "未知时间";

}

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

long time = date.getTime() / 1000;

long now = new Date().getTime() / 1000;

long ago = now - time;

if(ago <= ONE_HOUR){

return ago / ONE_MINUTE + "分钟前";

}

else if(ago <= ONE_DAY){

return ago / ONE_HOUR + "小时" + (ago % ONE_HOUR / ONE_MINUTE)+ "分钟前";

}

else if(ago <= ONE_DAY * 2){

return "昨天" + calendar.get(Calendar.HOUR_OF_DAY) + "点"+ calendar.get(Calendar.MINUTE) + "分";

}

else if (ago <= ONE_DAY * 3){

return "前天" + calendar.get(Calendar.HOUR_OF_DAY) + "点" + calendar.get(Calendar.MINUTE) + "分";

}

else if (ago <= ONE_MONTH){

long day = ago / ONE_DAY;

if(day < 7)

return day + "天前" ;

else if (day >= 7 && day <14)

return "1周前";

else if (day >=14 && day <21)

return "2周前";

else if (day >= 21 && day <28)

return "3周前";

else

return "4周前";

}

else if (ago <= ONE_YEAR){

long month = ago / ONE_MONTH;

long day = ago % ONE_MONTH / ONE_DAY;

return month + "个月" + day + "天前";

}

else {

long year = ago / ONE_YEAR;

int month = calendar.get(Calendar.MONTH) + 1;// JANUARY which is 0 so month+1

return year + "年前" + month + "月" + calendar.get(Calendar.DATE)

+ "日";

}

}

}

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