TimeUtils.java

/*
 * 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.
 */

package com.google.android.apps.iosched.util;

import android.content.Context;

public class TimeUtils {

    private static final int SECOND = 1000;
    private static final int MINUTE = 60 * SECOND;
    private static final int HOUR = 60 * MINUTE;
    private static final int DAY = 24 * HOUR;

    public static String getTimeAgo(long time, Context ctx) {
        // TODO: use DateUtils methods instead
        if (time < 1000000000000L) {
            // if timestamp given in seconds, convert to millis
            time *= 1000;
        }

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

        final long diff = now - time;
        if (diff < MINUTE) {
            return "just now";
        } else if (diff < 2 * MINUTE) {
            return "a minute ago";
        } else if (diff < 50 * MINUTE) {
            return diff / MINUTE + " minutes ago";
        } else if (diff < 90 * MINUTE) {
            return "an hour ago";
        } else if (diff < 24 * HOUR) {
            return diff / HOUR + " hours ago";
        } else if (diff < 48 * HOUR) {
            return "yesterday";
        } else {
            return diff / DAY + " days ago";
        }
    }

}