sis-background/gyee-sample-impala/src/main/java/com/gyee/sampleimpala/common/util/DateUtil.java

package com.gyee.sampleimpala.common.util;

import lombok.extern.slf4j.Slf4j;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

@Slf4j
public class DateUtil {

    /**
     * 获取当前时间
     *
     * @return
     */
    public static String getCurrentDate() {
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
        String date = df.format(new Date());
        return date;
    }

    /**
     * 获取前 N 小时的时间
     *
     * @param hour
     * @return
     */
    public static String getPreviousDate(int hour) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) - hour);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = df.format(calendar.getTime());
        return date;
    }

    /**
     * 获取当前时间后 N 小时的时间
     *
     * @param hour
     * @return
     */
    public static String getNextDate(int hour) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + hour);
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = df.format(calendar.getTime());
        return date;
    }

    /**
     * 获取当前时间后 N 小时的时间
     *
     * @param hour
     * @return
     */
    public static Long getNextDateTimestamp(int hour) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + hour);
        long time = calendar.getTime().getTime();
        return time;
    }

    /**
     * 字符串时间转时间戳
     * @param time
     * @return
     */
    public static Long covertDateTimestamp(String time){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long stamp = 0;
        try {
            stamp = sdf.parse(time).getTime();
        } catch (ParseException e) {
            e.printStackTrace();
        }

        return stamp;
    }


    public static void main(String[] args) {
        System.out.println(getCurrentDate());
        System.out.println(getPreviousDate(3 * 360 * 24));
//        System.out.println(covertDateTimestamp("2021-05-12 00:00:00"));
    }
}