DateUtil--日期转换工具

冷不防 2022-09-21 14:27 206阅读 0赞

## DateUtil–日期转换工具 ##

DateUtil.java

public class DateUtil { 
        private static final long S = 1000L;//一秒
        private static final long MIN = 60 * S;//一分钟
        private static final long H = 60 * MIN;//一小时
        private static final long D = 24 * H;//一天
        private static final long Y = 365 * D;//365天
    
        //@by zhiqiang: 2016/5/27 定义日期的格式
        private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        private static SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm");
        private static SimpleDateFormat monthFormat = new SimpleDateFormat("MM-dd HH:mm");
    
    
        /** * @by zhiqiang 2016/5/27 转换date数据格式 可以写在工具类中 */
        public static String changeDateFormat(String date, String type) {
    
            //将传过来的字符串转化一次
            Date old = null;
            try {
                //解析字符串
                sdf.setTimeZone(TimeZone.getTimeZone(type));
                old = sdf.parse(date);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            //@by zhiqiang: 2016/5/27 获取当前日期
            Date newD = new Date();
            //@by zhiqiang: 2016/5/27 如果当前时间在传递过来的时间之前
            if (newD.before(old)) {
                return yearFormat.format(old);
            }
    
            return parseDate(old, newD);
    
        }
    
        /** * @by zhiqiang 2016/6/13 根据当前时间的毫秒值计算 */
        private static String parseDate(Date old, Date newD) {
            if (old != null && newD != null) {
                final long oldTime = old.getTime();
                final long newTime = newD.getTime();
                final long time = newTime - oldTime;
    
                if (time <= MIN) {    //1分钟之内 just
                    return "just";
                } else if (time <= H) {    //1小时之内 几分钟之前
                    int minter = (int) (time / MIN);
                    return minter + " " + "分钟前";
                } else if (time <= D) {
       //1天之内 几小时之前
                    int hour = (int) (time / H);
                    return hour + " 小时前";
                } else if (time <= 7 * D) {
       //7天之内
                    int day = (int) (time / D);
                    if (day == 1) {
       //一天前
                        return "昨天";
                    } else {
                        return day + " 天前";
                    }
                } else if (time <= Y) {
       //365天之内
                    sdf.setTimeZone(TimeZone.getDefault());
                    return monthFormat.format(old);
                } else {
                    sdf.setTimeZone(TimeZone.getDefault());
                    return yearFormat.format(old);
                }
            }
            return "";
        }
    }

--------------------

显示日期

public class MainActivity extends AppCompatActivity { 
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            TextView tv_old = (TextView) findViewById(R.id.tv_old);
            TextView tv_new = (TextView) findViewById(R.id.tv_new);
    
            String oldDateString = "2016-06-20 16:09:08";
    
            String change = DateUtil.changeDateFormat(oldDateString,"GMT:+08:00");
    
            tv_old.setText(oldDateString);
            tv_new.setText(change);
    
        }
    }