ConstDateUtil.java
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package com.ruoyi.utils;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.Date;
public class ConstDateUtil {
public static String formatDate(String str){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat(str);
return simpleDateFormat.format(new Date());
}
public static String formatDate(long time){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
return simpleDateFormat.format(new Date(time));
}
public static String formatDate(Date date){
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMdd");
return simpleDateFormat.format(date);
}
public static Date getTheSpecifiedNumberOfDaysOfTime(Integer amount) {
// 获取当前日期时间
Calendar calendar = Calendar.getInstance();
// 将日期减去一天
calendar.add(Calendar.DAY_OF_MONTH, amount);
// 获取昨天的日期时间
return calendar.getTime();
}
public static LocalDateTime getLocalDateTimeByLongTime(long time){
Instant instant = Instant.ofEpochMilli(time);
LocalDateTime localDateTime = instant.atZone(ZoneId.systemDefault()).toLocalDateTime();
return localDateTime;
}
}