Jeremy Logan Jeremy Logan - 3 months ago 32
Java Question

How can I calculate a time span in Java and format the output?

I want to take two times (in seconds since epoch) and show the difference between the two in formats like:


  • 2 minutes

  • 1 hour, 15 minutes

  • 3 hours, 9 minutes

  • 1 minute ago

  • 1 hour, 2 minutes ago



How can I accomplish this??

Answer
    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" : ""));
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