"Time Since/Ago" Library for Android/Java [closed]

From the Google I/O 2012 App:

/*
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

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, Context ctx) {
    if (time < 1000000000000L) {
        // if timestamp given in seconds, convert to millis
        time *= 1000;
    }

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

    // TODO: localize
    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";
    }
}

Check out DateUtils.getRelativeTimeSpanString(), it's been around since API level 3.

From jquery timeago plugin

This provides you more options and formats than the answers above.

public static Date currentDate() {
    Calendar calendar = Calendar.getInstance();
    return calendar.getTime();
}

public static String getTimeAgo(Date date, Context ctx) {

    if(date == null) {
        return null;
    }

    long time = date.getTime();

    Date curDate = currentDate();
    long now = curDate.getTime();
    if (time > now || time <= 0) {
        return null;
    }

    int dim = getTimeDistanceInMinutes(time);

    String timeAgo = null;

    if (dim == 0) {
        timeAgo = ctx.getResources().getString(R.string.date_util_term_less) + " " +  ctx.getResources().getString(R.string.date_util_term_a) + " " + ctx.getResources().getString(R.string.date_util_unit_minute);
    } else if (dim == 1) {
        return "1 " + ctx.getResources().getString(R.string.date_util_unit_minute);
    } else if (dim >= 2 && dim <= 44) {
        timeAgo = dim + " " + ctx.getResources().getString(R.string.date_util_unit_minutes);
    } else if (dim >= 45 && dim <= 89) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_about) + " "+ctx.getResources().getString(R.string.date_util_term_an)+ " " + ctx.getResources().getString(R.string.date_util_unit_hour);
    } else if (dim >= 90 && dim <= 1439) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_about) + " " + (Math.round(dim / 60)) + " " + ctx.getResources().getString(R.string.date_util_unit_hours);
    } else if (dim >= 1440 && dim <= 2519) {
        timeAgo = "1 " + ctx.getResources().getString(R.string.date_util_unit_day);
    } else if (dim >= 2520 && dim <= 43199) {
        timeAgo = (Math.round(dim / 1440)) + " " + ctx.getResources().getString(R.string.date_util_unit_days);
    } else if (dim >= 43200 && dim <= 86399) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_about) + " "+ctx.getResources().getString(R.string.date_util_term_a)+ " " + ctx.getResources().getString(R.string.date_util_unit_month);
    } else if (dim >= 86400 && dim <= 525599) {
        timeAgo = (Math.round(dim / 43200)) + " " + ctx.getResources().getString(R.string.date_util_unit_months);
    } else if (dim >= 525600 && dim <= 655199) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_about) + " "+ctx.getResources().getString(R.string.date_util_term_a)+ " " + ctx.getResources().getString(R.string.date_util_unit_year);
    } else if (dim >= 655200 && dim <= 914399) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_over) + " "+ctx.getResources().getString(R.string.date_util_term_a)+ " " + ctx.getResources().getString(R.string.date_util_unit_year);
    } else if (dim >= 914400 && dim <= 1051199) {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_almost) + " 2 " + ctx.getResources().getString(R.string.date_util_unit_years);
    } else {
        timeAgo = ctx.getResources().getString(R.string.date_util_prefix_about) + " " + (Math.round(dim / 525600)) + " " + ctx.getResources().getString(R.string.date_util_unit_years);
    }

    return timeAgo + " " + ctx.getResources().getString(R.string.date_util_suffix);
}

private static int getTimeDistanceInMinutes(long time) {
      long timeDistance = currentDate().getTime() - time;
      return Math.round((Math.abs(timeDistance) / 1000) / 60);
}

Add following strings in your string.xml file

<!-- Date Util -->
<string name="date_util_term_less">less than</string>
<string name="date_util_term_a">a</string>
<string name="date_util_term_an">an</string>

<string name="date_util_unit_second">second</string>
<string name="date_util_unit_seconds">seconds</string>
<string name="date_util_unit_minute">minute</string>
<string name="date_util_unit_minutes">minutes</string>
<string name="date_util_unit_hour">hour</string>
<string name="date_util_unit_hours">hours</string>
<string name="date_util_unit_day">day</string>
<string name="date_util_unit_days">days</string>
<string name="date_util_unit_month">month</string>
<string name="date_util_unit_months">months</string>
<string name="date_util_unit_year">year</string>
<string name="date_util_unit_years">years</string>

<string name="date_util_prefix_lt">less than a</string>
<string name="date_util_prefix_about">about</string>
<string name="date_util_prefix_over">over</string>
<string name="date_util_prefix_almost">almost</string>

<string name="date_util_suffix">ago</string>

You can use the built-in DateUtils class with the getRelative...() methods.