Android Date Relative Format getHumanReadableDateDiff(Date pastDate, boolean unknownIfNull)

Description

Returns some kind of human readable representation of a past date, e.g.

Parameter

Parameter	Description
date	a parameter

Declaration

public static String getHumanReadableDateDiff(Date pastDate,
        boolean unknownIfNull) 

Method Source Code

//package com.java2s;

import java.util.Date;
import java.util.concurrent.TimeUnit;

public class Main {
    /**//www.j  a va  2 s.  c om
     * Returns some kind of human readable representation of a past date, e.g. "4 mins ago," "2 days ago"
     * @param date
     * @return
     */
    public static String getHumanReadableDateDiff(Date pastDate,
            boolean unknownIfNull) {

        // TODO: localize
        if (pastDate == null || pastDate.getTime() == 0) {
            return unknownIfNull ? "Unknown" : "Never";
        }

        Date currentDate = new Date();

        long timeDiff = currentDate.getTime() - pastDate.getTime();

        if (timeDiff < TimeUnit.SECONDS.toMillis(60)) { // less than a minute ago
            return "<1 min ago";
        } else if (timeDiff < TimeUnit.SECONDS.toMillis(60 * 60)) { // less than an hour ago
            long mins = Math.round(TimeUnit.SECONDS.convert(timeDiff,
                    TimeUnit.MILLISECONDS) / 60.0);
            if (mins == 1) {
                return "1 min ago";
            } else {
                return mins + " mins ago";
            }
        } else if (timeDiff < TimeUnit.SECONDS.toMillis(60 * 60 * 24)) { // less than a day ago
            long hours = Math.round(TimeUnit.SECONDS.convert(timeDiff,
                    TimeUnit.MILLISECONDS) / (60.0 * 60));
            if (hours == 1) {
                return "1 hour ago";
            } else {
                return hours + " hours ago";
            }
        } else if (timeDiff < TimeUnit.SECONDS.toMillis(60 * 60 * 24 * 31)) { // less than 31 days ago
            long days = Math.round(TimeUnit.SECONDS.convert(timeDiff,
                    TimeUnit.MILLISECONDS) / (60.0 * 60 * 24));
            if (days == 1) {
                return "1 day ago";
            } else {
                return days + " days ago";
            }
        } else if (timeDiff < TimeUnit.SECONDS.toMillis(60 * 60 * 24 * 365)) { // less than a year ago

            long months = Math.round(TimeUnit.SECONDS.convert(timeDiff,
                    TimeUnit.MILLISECONDS) / (60.0 * 60 * 24 * 30));

            if (months == 1) {
                return "1 month ago";
            } else {
                return months + " months ago";
            }
        } else {
            return ">1 year ago";
        }
    }
}

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