public class TimeUtils {

    public static String timeFormat(long timeMillis, String pattern){
        SimpleDateFormat format = new SimpleDateFormat(pattern, Locale.CHINA);
        return format.format(new Date(timeMillis));
}

    public static String formatPhotoDate(long time){
        return timeFormat
 
(time, "yyyy-MM-dd");
}

    public static String formatPhotoDate(String path){
        File file = new File(path);
        if(file.exists()){
            long time = file.lastModified();
            return formatPhotoDate(time);
}
        return "1970-01-01";
}
}