we-com-manage/we-com-server/src/main/java/com/tzld/piaoquan/wecom/utils/DateUtil.java

package com.tzld.piaoquan.wecom.utils;


import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;

public class DateUtil {

    //获取当天的日期
    public static Date getThatDayDate() {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        return calendar.getTime();
    }
    public static Date getDaysAgoDate(int day) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.add(Calendar.DAY_OF_YEAR, -day);
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        return calendar.getTime();
    }

    public static String getBeforeDayDateString() {
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyyMMdd");
        LocalDate today = LocalDate.now();
        LocalDate yesterday = today.minusDays(1);
        return dateFormat.format(yesterday);
    }

    public static String getThatDayDateString() {
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        LocalDate today = LocalDate.now();
        return dateFormat.format(today);
    }

    public static String getNextDayDateString() {
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        LocalDate tomorrow = LocalDate.now().minusDays(-1);
        return dateFormat.format(tomorrow);
    }


    public static String getDayDateString(String pattern) {
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern(pattern);
        LocalDate today = LocalDate.now();
        return dateFormat.format(today);
    }

    public static String getDateString(Long timestamp) {
        // 创建日期时间格式化器
        DateTimeFormatter dateFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        // 将时间戳转换为 LocalDateTime
        LocalDateTime dateTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault());
        // 格式化日期时间并返回
        return dateTime.format(dateFormat);
    }

    public static Long dateDifference(Date date1, Date date2) {
        return Math.abs(date1.getTime() - date2.getTime());
    }

    public static Integer getHourOfDay() {
        Calendar calendar = Calendar.getInstance();
        return calendar.get(Calendar.HOUR_OF_DAY);
    }

}