package com.whyc.util;
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import java.text.SimpleDateFormat;
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import java.util.Calendar;
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import java.util.Date;
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/**
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* 日期处理工具类
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* @Author xuzhongpei
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* @Date 2023-11-16
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* */
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public class DateUtil {
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/**ThreadLocal副本形式避免多线程中 数据安全问题*/
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private static ThreadLocal<SimpleDateFormat> YYYY_MM_DD_HH_MM_SS = ThreadLocal.withInitial(()->new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"));
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private static ThreadLocal<SimpleDateFormat> YYYY_MM_DD_HH_MM_SS2 = ThreadLocal.withInitial(()->new SimpleDateFormat("yyyy-MM-dd_HH_mm_ss"));
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private static ThreadLocal<SimpleDateFormat> YYYY_MM_DD_HH_MM_SS_UNION = ThreadLocal.withInitial(()->new SimpleDateFormat("yyyyMMddHHmmss"));
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private static ThreadLocal<SimpleDateFormat> YYYY_MM_DD = ThreadLocal.withInitial(()->new SimpleDateFormat("yyyy-MM-dd"));
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private static ThreadLocal<SimpleDateFormat> YYYY_MM_DD_UNION = ThreadLocal.withInitial(()->new SimpleDateFormat("yyyyMMdd"));
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public static String format_YYYY_MM_DD_HH_MM_SS(Date date){
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return YYYY_MM_DD_HH_MM_SS.get().format(date);
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}
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public static String format_YYYY_MM_DD_HH_MM_SS2(Date date){
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return YYYY_MM_DD_HH_MM_SS2.get().format(date);
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}
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public static String format_YYYY_MM_DD_HH_MM_SS_UNION(Date date){
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return YYYY_MM_DD_HH_MM_SS_UNION.get().format(date);
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}
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public static String YYYY_MM_DD(Date date){
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return YYYY_MM_DD.get().format(date);
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}
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public static String format_YYYY_MM_DD_UNION(Date date){
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return YYYY_MM_DD_UNION.get().format(date);
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}
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//获取指定年月的天数
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public static int getDaysByYearMonth(int year, int month) {
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Calendar a = Calendar.getInstance();
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a.set(Calendar.YEAR, year);
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a.set(Calendar.MONTH, month - 1);
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a.set(Calendar.DATE, 1);
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a.roll(Calendar.DATE, -1);
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int maxDate = a.get(Calendar.DATE);
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return maxDate;
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}
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//获取某年某月的起始和结束时间
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//需要注意的是：月份是从0开始的，比如说如果输入5的话，实际上显示的是4月份的最后一天，千万不要搞错了哦
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public static String getLastDayOfMonth(int year, int month) {
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Calendar cal = Calendar.getInstance();
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cal.set(Calendar.YEAR, year);
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cal.set(Calendar.MONTH, month);
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cal.set(Calendar.DAY_OF_MONTH,cal.getActualMaximum(Calendar.DATE));
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return new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime())+"23:59:59";
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}
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public static String getFirstDayOfMonth(int year, int month) {
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Calendar cal = Calendar.getInstance();
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cal.set(Calendar.YEAR, year);
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cal.set(Calendar.MONTH, month);
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cal.set(Calendar.DAY_OF_MONTH,cal.getMinimum(Calendar.DATE));
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return new SimpleDateFormat( "yyyy-MM-dd ").format(cal.getTime())+"00:00:00";
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}
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//获取当前时间的年份
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public static int getNowYear(){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(new Date()); //设置时间为当前时间
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int year = ca.get(Calendar.YEAR);
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//System.out.println(month);
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return year;
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}
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//获取当前时间的月份
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public static int getNowMonth(){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(new Date()); //设置时间为当前时间
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int month = ca.get(Calendar.MONTH) + 1;
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//System.out.println(month);
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return month;
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}
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//获取当前时间的日期
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public static int getNowDay(){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(new Date()); //设置时间为当前时间
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int day = ca.get(Calendar.DAY_OF_MONTH);
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//System.out.println(month);
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return day;
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}
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//当前时间加上x小时
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public static String getDateAdd(int minute){
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Date date = new Date();
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Calendar c = Calendar.getInstance();
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c.setTime(date);
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c.add(Calendar.MINUTE, minute);
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return new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss").format(c.getTime());
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}
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//获取时间的年份
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public static int getDateYear(Date date){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(date); //设置时间为当前时间
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int year = ca.get(Calendar.YEAR);
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//System.out.println(month);
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return year;
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}
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//获取时间的月份
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public static int getDateMonth(Date date){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(date); //设置时间为当前时间
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int month = ca.get(Calendar.MONTH) + 1;
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//System.out.println(month);
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return month;
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}
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//获取时间的日期
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public static int getDateDay(Date date){
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Calendar ca = Calendar.getInstance();//得到一个Calendar的实例
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ca.setTime(date); //设置时间为当前时间
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int day = ca.get(Calendar.DAY_OF_MONTH);
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//System.out.println(month);
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return day;
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}
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//当前时间加上x小时
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public static Date getDateAdd(Date date,int minute){
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Calendar c = Calendar.getInstance();
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c.setTime(date);
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c.add(Calendar.MINUTE, minute);
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return c.getTime();
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}
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}
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