date/time field value out of r

这个错误提示意思是日期/时间字段的值超出了范围。可能是因为输入的日期或时间格式不正确，或者超出了数据库支持的日期/时间范围。需要检查输入的日期/时间格式是否正确，并确保输入的日期/时间在数据库支持的范围内。

相关问题

ERROR: date/time field value out of range

This error message usually occurs when you are trying to insert a date or time value that is outside the range of acceptable values.

For example, if you are trying to insert a date value of "2022-02-30", which is not a valid date as February only has 28 or 29 days depending on the year. Similarly, if you are trying to insert a time value of "25:00:00", which is not a valid time as there are only 24 hours in a day.

To fix this error, you need to make sure that the date or time value you are inserting is within the acceptable range. You can also use data validation techniques to ensure that the inputs are within the acceptable range before inserting them into the database.

b) Make the clock show the current time. For this you should use the Calendar class from java.util with: ● Calendar.getInstance() - create Calendar object for current date/time ● get(field) - return integer field from Calendar object, where field may be Calendar.HOUR, Calendar.MINUTE, Calendar.SECOND, Calendar.AM_PM, etc. ● the value returned from Calendar.AM_PM may be compared with the values Calendar.AM and Calendar.PM to determine if it is before or after mid-day Create a function that runs continuously and updates the display to always show the current time.应该怎么写？

你可以使用以下代码实现一个实时更新的时钟：

import java.util.Calendar;

public class Clock {
    public static void main(String[] args) {
        while (true) {
            Calendar calendar = Calendar.getInstance();
            int hour = calendar.get(Calendar.HOUR);
            int minute = calendar.get(Calendar.MINUTE);
            int second = calendar.get(Calendar.SECOND);
            int amPm = calendar.get(Calendar.AM_PM);
            String amPmStr = amPm == Calendar.AM ? "AM" : "PM";
            String time = String.format("%02d:%02d:%02d %s", hour, minute, second, amPmStr);
            System.out.print("\r" + time);
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

在这个程序中，我们使用 `Calendar.getInstance()` 获取当前日期和时间的 `Calendar` 对象，并使用 `get()` 方法获取小时、分钟、秒和上午/下午的值。然后，我们使用 `String.format()` 方法格式化字符串，并使用 `System.out.print()` 方法在控制台上输出当前时间。通过使用 `\r`，我们可以在每秒更新时覆盖前一个时间的输出，从而创建实时更新的时钟。最后，我们使用 `Thread.sleep()` 方法暂停程序一秒钟，以便下一秒钟的时间可以被计算和输出。