技術標籤：Javajava

今天至未來某天的日期範圍

    /**
     * 返回今天的日期最小值
     */
    public static LocalDateTime minDate(){
        LocalDate localDate = LocalDate.now();
        LocalTime localTime = LocalTime.MIN;
        LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
        return localDateTime;
 

    }

    /**
     * 返回未來某天的日期最大值
     */
    public static LocalDateTime maxDateByDays(Integer day){
        LocalDate localDate = LocalDate.now().plusDays(day);
        LocalTime localTime = LocalTime.MAX;
        LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
        return
 
 localDateTime;
    }

• 測試 【獲取日期範圍在2021-01-02-----2021-01-05之間的值】

    public static void main(String[] args) {
        System.out.println(minDate());  // 2021-01-02T00:00
        System.out.println(maxDateByDays(3)); // 2021-01-05T23:59:59.999999999
    }

將日期格式化

    /**
     * 返回今天的日期最小值
     */
    public static String minDateFormatted
 
(){
        LocalDate localDate = LocalDate.now();
        LocalTime localTime = LocalTime.MIN;
        LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
        String format = localDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        return format;
    }

      /**
     * 返回未來某天的日期最大值
     */
    public static String maxDateByDaysFormatted(Integer day){
        LocalDate localDate = LocalDate.now().plusDays(day);
        LocalTime localTime = LocalTime.MAX;
        LocalDateTime localDateTime = LocalDateTime.of(localDate, localTime);
        String format = localDateTime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
        return format;
    }

• 再次測試

    public static void main(String[] args) {
       // System.out.println(minDate());  // 2021-01-02T00:00
       // System.out.println(maxDateByDays(3)); // 2021-01-05T23:59:59.999999999

        System.out.println(minDateFormatted()); //2021-01-02 00:00:00
        System.out.println(maxDateByDaysFormatted(6)); //2021-01-08 23:59:59

    }