如何检查日期是否在某个星期或某个季度[关闭]

Question

我需要一个 Java 逻辑来检查某个日期（假设 2017 年 4 月 18 日）是否在本周。 此外，我们一年有 4 个季度 （一月、二月、三月） - 第一季度 （四月、五月、六月） - 2Q 所以我需要知道同一日期是否在当前季度。 将不胜感激任何回复

Answer 1

我会说做这些步骤，

1 - 找出一周的第一天和最后一天 Get current week start and end date in Java - (MONDAY TO SUNDAY)

2 - 检查日期是否在该范围内 Java: how do I check if a Date is within a certain range? - 如果是，则在一周内 - 如果没有，它不会

3 - 对季度做同样的事情，有开始和结束日期，并检查日期是否在它们之间

   //import java.util.*;
   //import java.text.*;

public static void main(String[] args) {

    try {
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");

        Date dateToTest = sdf.parse("18/04/2017");

        //lets assume the date source is a variable, hence extract year off of it

        String firstDateInString = "01/04/" +  Integer.toString(getYear(dateToTest));
        String secondDateInString = "01/07/" +  Integer.toString(getYear(dateToTest));
        String thirdDateInString = "01/10/" +  Integer.toString(getYear(dateToTest));

        Date firstDate = sdf.parse(firstDateInString);
        Date secondDate = sdf.parse(secondDateInString);
        Date thirdDate = sdf.parse(thirdDateInString);


        //check if in first quarter
        //if date is before April it has to be first Q
        if (dateToTest.before(firstDate)) {
            System.out.println("First Quarter");
            return;
        }
        //check if in second quarter
        //if date is before August it has to be first Q
        if (dateToTest.before(secondDate)) {
            System.out.println("Second Quarter");
            return;
        }

        //check if in 3rd quarter
        //if date is before August it has to be first Q
        if (dateToTest.before(thirdDate)) {
            System.out.println("third Quarter");
            return;
        }

        //well then the date must be in 4th quarter
        System.out.println("Fourth quarter");
    } catch (Exception err) {
        System.out.println(err);
    }
}

private static int getYear(Date date) {
    Calendar cal = Calendar.getInstance();
    cal.setTime(date);
    return cal.get(Calendar.YEAR);

}

免责声明：此代码不是最佳方法。请注意，这里我不假设当前日期或年份。此处的目的仅是展示一般策略。