package com.dsh.course.util;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.time.LocalDateTime;
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import java.time.ZoneId;
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import java.util.Date;
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//根据当前传入的时间,返回距离当前时间多少天
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public class StudyTimeUtil {
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private StudyTimeUtil() {
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}
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/**
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* 获取两个时间的间隔(秒)Obtain the time difference between two instances (in seconds).
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*
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* @param startDate 开始的时间
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* @return 返回当前时间与开始时间的相差天数
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*/
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public static int getDateBetween(Date startDate) throws ParseException {
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Date endDate = new Date();
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SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
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long startDateTime = dateFormat.parse(dateFormat.format(startDate)).getTime();
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long endDateTime = dateFormat.parse(dateFormat.format(endDate)).getTime();
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int days = (int)((endDateTime - startDateTime) / (1000 * 3600 * 24));
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return days;
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}
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public static Date getStartDate(LocalDateTime localDate) {
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Date date = Date.from(localDate.atZone(ZoneId.systemDefault()).toInstant());
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return date;
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}
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}
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