1360. 日期之间隔几天

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Java代码：

【DateFormat】DateFormat用于实现日期的格式化

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;  // 好像已过时class Solution {public int daysBetweenDates(String date1, String date2) {DateFormat dft = new SimpleDateFormat("yyyy-MM-dd");long sum = 0;try {Date start = dft.parse(date1);Date end = dft.parse(date2);long startTimeMillion = start.getTime();long endTimeMillion = end.getTime();sum = endTimeMillion - startTimeMillion;  // 时间戳相差的毫秒数} catch (ParseException e) {e.printStackTrace();}return Math.abs(Math.toIntExact(sum / 24 / 60 / 60 / 1000));}
}

Date 和 LocalDate 的区别

https://www.runoob.com/manual/jdk11api/java.base/java/time/LocalDate.html#parse(java.lang.CharSequence)

https://www.runoob.com/manual/jdk11api/java.base/java/time/temporal/ChronoUnit.html#DAYS

import java.time.LocalDate;
import java.time.temporal.ChronoUnit;class Solution {public int daysBetweenDates(String date1, String date2) {LocalDate startDate = LocalDate.parse(date1);LocalDate endDate = LocalDate.parse(date2);long daysDiff = ChronoUnit.DAYS.between(startDate, endDate);return Math.abs((int)daysDiff);}
}