LocalDatetime 원하는 날짜 설정.

LocalDateTime dateTime = LocalDateTime.of(2023, Month.JANUARY, 1, 10, 0, 0);
LocalDateTime previousTime = dateTime.minusSeconds(1);

저장저장

 

minusHour 등등 가능

 

 

 

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Date로 설정 :

 

import java.util.Calendar;
import java.util.Date;

public class Main {
    public static void main(String[] args) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, 2022);
        cal.set(Calendar.MONTH, Calendar.JANUARY);
        cal.set(Calendar.DAY_OF_MONTH, 1);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        Date date = cal.getTime();
        System.out.println(date);
    }
}