Getting time diff from timestamp in Java

You have a timestamp and you want to get the difference in string like the folowing:

10 sec ago
3 minute ago
7 days ago
 and so on.

The following function does it.

private String getTimeDiff(long timestamp){
    String timeDiffStr = "";
    Calendar cal = Calendar.getInstance();
    long currentTimeInMillis = cal.getTimeInMillis();
    long timeDiff = (currentTimeInMillis - timestamp) / 1000;
    if(timeDiff < 60){
        timeDiffStr = timeDiff + " seconds ago";
        return timeDiffStr;
    }
    timeDiff = timeDiff / 60;
    if(timeDiff < 60){
        timeDiffStr = timeDiff + " minutes ago";
        return timeDiffStr;
    }
    timeDiff = timeDiff / 60; // in hours
    if(timeDiff < 24){
        timeDiffStr = timeDiff + " hours ago";
        return timeDiffStr;
    }
    timeDiff = timeDiff / 24; // in days
    if(timeDiff <= 7){
        timeDiffStr = timeDiff + " days ago";
        return timeDiffStr;
    }
    timeDiff = timeDiff / 7;
    if(timeDiff <= 4){
        timeDiffStr = timeDiff + " weeks ago";
        return timeDiffStr;
    }
    timeDiff = timeDiff / 4;
    timeDiffStr = timeDiff + " months ago";
    return timeDiffStr;
}

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