dat-string

DateUtils.java

 /**
     * Returns a string describing a day relative to the current day. For example if the day is
     * today this function returns "Today", if the day was a week ago it returns "7 days ago", and
     * if the day is in 2 weeks it returns "in 14 days".
     *
     * @param r the resources
     * @param day the relative day to describe in UTC milliseconds
     * @param today the current time in UTC milliseconds
     */
    private static final String getRelativeDayString(Resources r, long day, long today) {
        Locale locale = r.getConfiguration().locale;
        if (locale == null) {
            locale = Locale.getDefault();
        }

        // TODO: use TimeZone.getOffset instead.
        Time startTime = new Time();
        startTime.set(day);
        int startDay = Time.getJulianDay(day, startTime.gmtoff);

        Time currentTime = new Time();
        currentTime.set(today);
        int currentDay = Time.getJulianDay(today, currentTime.gmtoff);

        int days = Math.abs(currentDay - startDay);
        boolean past = (today > day);

        // TODO: some locales name other days too, such as de_DE's "Vorgestern" (today - 2).
        if (days == 1) {
            if (past) {
                return LocaleData.get(locale).yesterday;
            } else {
                return LocaleData.get(locale).tomorrow;
            }
        } else if (days == 0) {
            return LocaleData.get(locale).today;
        }

        int resId;
        if (past) {
            resId = com.android.internal.R.plurals.num_days_ago;
        } else {
            resId = com.android.internal.R.plurals.in_num_days;
        }

        String format = r.getQuantityString(resId, days);
        return String.format(format, days);
    }