JAVA获取整点时间

谁借莪１个温暖的怀抱￠ 2023-01-08 11:25 123阅读 0赞

public class TimeStampTest {
        public static void main(String[] args) {
            // 方式一
            int endTime = currentSeconds() - currentSeconds() % 3600;
            int startTime = endTime - 3600;
            System.out.println("startTime => " + formatTime(startTime));
            System.out.println("endTime => " + formatTime(endTime));
            
            System.out.println("----------------------------------");
            
            // 方式二
            Calendar calendar = Calendar.getInstance();
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);
            int hourTime = (int) (calendar.getTimeInMillis() / 1000);
            System.out.println(formatTime(hourTime));
        }
        /**
         * 格式时间戳
         *
         * @param timeStamp 十位时间戳
         */
        private static String formatTime(Integer timeStamp) {
            Date date = new Date(Long.parseLong(timeStamp + "000"));
            String strDateFormat = "yyyy-MM-dd HH:mm:ss";
            SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
            return sdf.format(date);
        }
        /**
         * 返回当前时间戳
         *
         * @return 十位时间戳
         */
        private static int currentSeconds() {
            return (int) (System.currentTimeMillis() / 1000);
        }
    }

public class TimeStampTest {
        public static void main(String[] args) {
            System.out.println(formatTime(getLastHourTime(1)));
            System.out.println(formatTime(getLastHourTime(2)));
        }
        /**
         * 获取上n个小时整点小时的时间戳
         *
         * @param n 往前几个小时
         * @return 十位时间戳
         */
        public static Integer getLastHourTime(int n) {
            Calendar ca = Calendar.getInstance();
            ca.set(Calendar.MINUTE, 0);
            ca.set(Calendar.SECOND, 0);
            ca.set(Calendar.HOUR_OF_DAY, ca.get(Calendar.HOUR_OF_DAY) - n);
            return (int) (ca.getTimeInMillis() / 1000);
        }
        /**
         * 格式时间戳
         *
         * @param timeStamp 十位时间戳
         */
        private static String formatTime(Integer timeStamp) {
            Date date = new Date(Long.parseLong(timeStamp + "000"));
            String strDateFormat = "yyyy-MM-dd HH:mm:ss";
            SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
            return sdf.format(date);
        }
    }

[https://www.cnblogs.com/lm970585581/p/9212237.html][https_www.cnblogs.com_lm970585581_p_9212237.html]

[https_www.cnblogs.com_lm970585581_p_9212237.html]: https://www.cnblogs.com/lm970585581/p/9212237.html