如何用Joda-Time计算从现在开始的经过时间?

时间:2010-02-01 19:59:44

标签: java algorithm datetime grails jodatime

我需要计算从一个特定日期到现在经过的时间,并以与StackOverflow问题相同的格式显示它,即:

15s ago
2min ago
2hours ago
2days ago
25th Dec 08

您知道如何使用Java Joda-Time来实现它吗?是否有一个已经实现它的辅助方法,或者我应该自己编写算法?

6 个答案:

答案 0 :(得分:112)

要使用JodaTime计算已用时间,请使用Period。要格式化所需人工表示中的已用时间,请使用PeriodFormatter建立的PeriodFormatterBuilder

这是一个启动示例:

DateTime myBirthDate = new DateTime(1978, 3, 26, 12, 35, 0, 0);
DateTime now = new DateTime();
Period period = new Period(myBirthDate, now);

PeriodFormatter formatter = new PeriodFormatterBuilder()
    .appendSeconds().appendSuffix(" seconds ago\n")
    .appendMinutes().appendSuffix(" minutes ago\n")
    .appendHours().appendSuffix(" hours ago\n")
    .appendDays().appendSuffix(" days ago\n")
    .appendWeeks().appendSuffix(" weeks ago\n")
    .appendMonths().appendSuffix(" months ago\n")
    .appendYears().appendSuffix(" years ago\n")
    .printZeroNever()
    .toFormatter();

String elapsed = formatter.print(period);
System.out.println(elapsed);

现在打印

3 seconds ago
51 minutes ago
7 hours ago
6 days ago
10 months ago
31 years ago

(咳嗽,陈旧,咳嗽) 你看到我也考虑了数月和数年,并将其配置为在零值时省略值。

答案 1 :(得分:19)

使用PrettyTime表示简单的已用时间。

我尝试了HumanTime,因为@sfussenegger回答并使用了JodaTime的Period,但我找到的最简单,最干净的人类可读时间方法是PrettyTime库。

以下是输入和输出的几个简单示例:

前五分钟

DateTime fiveMinutesAgo = DateTime.now().minusMinutes( 5 );

new PrettyTime().format( fiveMinutesAgo.toDate() );

// Outputs: "5 minutes ago"

Ago Ago

DateTime birthday = new DateTime(1978, 3, 26, 12, 35, 0, 0);

new PrettyTime().format( birthday.toDate() );

// Outputs: "4 decades ago"

注意:我已经尝试过使用该库更精确的功能,但它会产生一些奇怪的结果,因此请小心使用它,并在非危及生命的项目中使用它。

JP

答案 2 :(得分:10)

您可以使用PeriodFormatter执行此操作,但您不必像other answers那样努力创建自己的PeriodFormatBuilder。如果它适合您的情况,您可以使用默认格式化程序:

Period period = new Period(startDate, endDate);
System.out.println(PeriodFormat.getDefault().print(period))

(在类似的问题上给小费提示this answer,我为了发现而交叉发帖)

答案 3 :(得分:7)

有一个名为HumanTime的小助手类,我很满意。

答案 4 :(得分:0)

这是使用 mysql 时间戳来获取到现在的经过时间。单数和复数被管理。只显示最大时间。

注意:设置您自己的时区。

String getElapsedTime(String strMysqlTimestamp) {
    
    DateTimeFormatter formatter = DateTimeFormat.forPattern("YYYY-MM-dd HH:mm:ss.S");
    DateTime mysqlDate = formatter.parseDateTime(strMysqlTimestamp).
                         withZone(DateTimeZone.forID("Asia/Kuala_Lumpur"));
    
    DateTime now = new DateTime();
    Period period = new Period(mysqlDate, now);
    
    int seconds = period.getSeconds();
    int minutes = period.getMinutes();
    int hours = period.getHours();
    int days = period.getDays();
    int weeks = period.getWeeks();
    int months = period.getMonths();
    int years = period.getYears();
    
    String elapsedTime = "";
    if (years != 0)
        if (years == 1)
            elapsedTime = years + " year ago";
        else
            elapsedTime = years + " years ago";
    else if (months != 0)
        if (months == 1)
            elapsedTime = months + " month ago";
        else
            elapsedTime = months + " months ago";
    else if (weeks != 0)
        if (weeks == 1)
            elapsedTime = weeks + " week ago";
        else
            elapsedTime = weeks + " weeks ago";
    else if (days != 0)
        if (days == 1)
            elapsedTime = days + " day ago";
        else
            elapsedTime = days + " days ago";
    else if (hours != 0)
        if (hours == 1)
            elapsedTime = hours + " hour ago";
        else
            elapsedTime = hours + " hours ago";
    else if (minutes != 0)
        if (minutes == 1)
            elapsedTime = minutes + " minute ago";
        else
            elapsedTime = minutes + " minutes ago";
    else if (seconds != 0)
        if (seconds == 1)
            elapsedTime = seconds + " second ago";
        else
            elapsedTime = seconds + " seconds ago";   
    
    return elapsedTime;
} 

答案 5 :(得分:0)

这是我的解决方案,使用joda time

private static final int SECOND_MILLIS = 1000;
private static final int MINUTE_MILLIS = 60 * SECOND_MILLIS;
private static final int HOUR_MILLIS = 60 * MINUTE_MILLIS;
private static final int DAY_MILLIS = 24 * HOUR_MILLIS;

public static String getTimeAgo(long time)
{
    if(time < 1000000000000L)
    {
        time *= 1000;
    }

    long now = System.currentTimeMillis();

    if(time > now || time <= 0)
    {
        return null;
    }

    final long diff = now - time;

    if(diff < MINUTE_MILLIS)
    {
        return "just now";
    }
    else if(diff < 2 * MINUTE_MILLIS)
    {
        return "a minute ago";
    }
    else if(diff < 50 * MINUTE_MILLIS)
    {
        return diff / MINUTE_MILLIS + " minutes ago";
    }
    else if(diff < 90 * MINUTE_MILLIS)
    {
        return "an hour ago";
    }
    else if(diff < 24 * HOUR_MILLIS)
    {
        return diff / HOUR_MILLIS + " hours ago";
    }
    else if(diff < 48 * HOUR_MILLIS)
    {
        return "yesterday";
    }
    else
    {
        return diff / DAY_MILLIS + " days ago";
    }
}

使用方法:

只需调用方法并在milliseconds中传入时间。

例如

long now = System.currentTimeMillis();
getTimeAgo(now);