java8日期工具类封装的实战记录

LocalDate today = LocalDate.now();
System.out.println("Today's Local date : " + today);


Today's Local date : 2021-08-27

LocalDate today = LocalDate.now();
int year = today.getYear();
int month = today.getMonthValue();
int day = today.getDayOfMonth();
System.out.printf("Year="+year + "month =" +month + "day ="+day);
 
Year=2021month = 8day=27

LocalDate yearAndMonthDay = LocalDate.of(2021, 08, 27);
System.out.println("yearAndMonthDay is : " + yearAndMonthDay);
 
yearAndMonthDay is : 2021-08-27

**
 * java 8 日期工具类再封装
 * 尽量用java8的工具类操作日期
 * @Date 2021/6/2 4:01 下午
 * @Author yn
 */
@Component
public class LocalDateUtil {


    /**
     * 比较第一个日期是否小于第二个日期
     * @param firstDate 第一个日期
     * @param secondDate 第二个日期
     * @return true-小于;false-大于
     */
    public static boolean localDateIsBefore(LocalDate firstDate, LocalDate secondDate) {
        return firstDate.isBefore(secondDate);
    }



    /**
     * 比较第一个日期是否大于第二个日期
     * @param firstDate 第一个日期
     * @param secondDate 第二个日期
     * @return true-大于;false-不大于
     */
    public static boolean localDateIsAfter(LocalDate firstDate, LocalDate secondDate) {
        return firstDate.isAfter(secondDate);
    }

    /**
     * 比较两个日期是否相等
     * @param firstDate 第一个日期
     * @param secondDate 第二个日期
     * @return true-相等;false-不相等
     */
    public static boolean localDateIsEqual(LocalDate firstDate, LocalDate secondDate) {
        return firstDate.isEqual(secondDate);
    }


    /**
     * 字符串转换datetime
     * @param dateTime
     * @return yyyy-MM-dd HH:mm:ss
     */
    public static Date stringCoverDateTime(String dateTime){
        LocalDateTime startDateTime =
                LocalDateTime.parse(dateTime, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        Date LocalDateTimeToDate = Date.from(startDateTime.atZone(ZoneId.systemDefault()).toInstant());
        return LocalDateTimeToDate;
    }


    /**
     * 字符串转换date
     * @param dateTime
     * @return  yyyy-MM-dd
     */
    public static Date stringCoverDate(String dateTime){
        LocalDateTime startDateTime =
                LocalDateTime.parse(dateTime, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
        Date LocalDateTimeToDate = Date.from(startDateTime.atZone(ZoneId.systemDefault()).toInstant());
        return LocalDateTimeToDate;
    }
}