java时间齐全的工具类（2022.6.1更新中）

import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;


public class DateUtil {
    public static final String DATE_FORMAT_YYYY = "yyyy";
    public static final String DATE_FORMAT_MM = "MM";
    public static final String DATE_FORMAT_YYYYMMDD = "yyyyMMdd";
    public static final String DATE_FORMAT_YYYY_MM_DD = "yyyy/MM/dd";
    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
    public static final String DEFAULT_MONTH_FORMAT = "yyyy-MM";
    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";
    public static final String DEFAULT_MONTH = "MONTH";
    public static final String DEFAULT_YEAR = "YEAR";
    public static final String DEFAULT_DATE = "DAY";
    public static final String DEFAULT_HOUR = "HOUR";
    public static final String DEFAULT_MINUTE = "MINUTE";
    public static final String DEFAULT_SECOND = "SECOND";
    public static final String DEFAULT_DATETIME_FORMAT_HH = "yyyy-MM-dd HH";
    public static final String DEFAULT_DATETIME_FORMAT = "yyyy-MM-dd HH-mm";
    public static final String DEFAULT_DATETIME_FORMAT_SEC = "yyyy-MM-dd HH:mm:ss";
    public static final String DEFAULT_DATETIME_FORMAT_MIN = "yyyy-MM-dd HH:mm";
    public static final String DEFAULT_DATETIME_FORMAT_S = "yyyyMMddHHmmss";
    /**
     * 获取当前的日期 yyyy-MM-dd HH:mm:ss
     */
    public  LocalDateTime getCurrentTime(){
        SimpleDateFormat sdf=new SimpleDateFormat(DEFAULT_DATETIME_FORMAT_SEC);
        String strDate=sdf.format(System.currentTimeMillis());
        DateTimeFormatter df = DateTimeFormatter.ofPattern(DEFAULT_DATETIME_FORMAT_SEC);
        return LocalDateTime.parse(strDate, df);
    }

    /**
     * 获取当前时间
     */
    public  String todayTime(){
        Calendar calendar= Calendar.getInstance();
        SimpleDateFormat dateFormat= new SimpleDateFormat(DEFAULT_DATETIME_FORMAT_SEC);
        return dateFormat.format(calendar.getTime());
    }
}