如何使用Java计算时间跨度并格式化输出？

Question

我想花两次（从纪元以来的秒数），以如下格式显示两者之间的差异：2分钟1小时15分钟3小时9分钟1分钟前1小时2分钟前我该怎么做？

Answer 1

Date start = new Date(1167627600000L); // JANUARY_1_2007

    Date end = new Date(1175400000000L); // APRIL_1_2007

    long diffInSeconds = (end.getTime() - start.getTime()) / 1000;

    long diff[] = new long[] { 0, 0, 0, 0 };

    /* sec */diff[3] = (diffInSeconds >= 60 ? diffInSeconds % 60 : diffInSeconds);

    /* min */diff[2] = (diffInSeconds = (diffInSeconds / 60)) >= 60 ? diffInSeconds % 60 : diffInSeconds;

    /* hours */diff[1] = (diffInSeconds = (diffInSeconds / 60)) >= 24 ? diffInSeconds % 24 : diffInSeconds;

    /* days */diff[0] = (diffInSeconds = (diffInSeconds / 24));

    System.out.println(String.format(

        "%d day%s, %d hour%s, %d minute%s, %d second%s ago",

        diff[0],

        diff[0] > 1 ? "s" : "",

        diff[1],

        diff[1] > 1 ? "s" : "",

        diff[2],

        diff[2] > 1 ? "s" : "",

        diff[3],

        diff[3] > 1 ? "s" : ""));