[java]察看两个日期间差多少秒/小时/天

package com.example.demo;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import org.apache.log4j.Logger;public class TimeTest { private static Logger log = Logger.getLogger(TimeTest.class); public static void main(String[] args) { String startTime="2019-10-26 15:27:00"; String endTime="2019-10-26 15:27:41"; log.info(startTime+"与"+endTime+"之间差"+getSecondsBetween(startTime,endTime)+"秒"); // 2019-9-31并不存在，这里证明SimpleDateFormat将字符串转数字不是那么让人放心 startTime="2019-9-31 00:00:00"; endTime="2019-10-01 00:00:00"; log.info(startTime+"与"+endTime+"之间差"+getSecondsBetween(startTime,endTime)+"秒"); // 2019-9-32也没报异常更让人担忧了 startTime="2019-9-32 00:00:00"; endTime="2019-10-02 00:00:00"; log.info(startTime+"与"+endTime+"之间差"+getSecondsBetween(startTime,endTime)+"秒"); startTime="2019-9-30 15:27:00"; endTime="2019-10-26 15:27:41"; log.info(startTime+"与"+endTime+"之间差"+getDaysBetween(startTime,endTime)+"天"); startTime="2019-10-26 08:00:00"; endTime="2019-10-26 15:41:41"; log.info(startTime+"与"+endTime+"之间差"+getHoursBetween(startTime,endTime)+"小时"); } /** * 两个时间之间差多少秒 * @param startTime * @param endTime * @return */ public static long getSecondsBetween(String startTime,String endTime) { SimpleDateFormat formatter =new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss"); long seconds = 0L; try { Date startDate = formatter.parse(startTime); long msStart = startDate.getTime(); Date endDate = formatter.parse(endTime); long msEnd = endDate.getTime(); seconds = ( msEnd-msStart ) / 1000 ; } catch (ParseException e) { e.printStackTrace(); } return seconds; } /** * 两个时间之间差多少天 * @param startTime * @param endTime * @return */ public static long getDaysBetween(String startTime,String endTime) { SimpleDateFormat formatter =new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss"); long seconds = 0L; try { Date startDate = formatter.parse(startTime); long msStart = startDate.getTime(); Date endDate = formatter.parse(endTime); long msEnd = endDate.getTime(); seconds = ( msEnd-msStart ) / (1000*60*60*24) ; } catch (ParseException e) { e.printStackTrace(); } return seconds; } /** * 两个时间之间差多少小时 * @param startTime * @param endTime * @return */ public static long getHoursBetween(String startTime,String endTime) { SimpleDateFormat formatter =new SimpleDateFormat( "yyyy-MM-dd hh:mm:ss"); long seconds = 0L; try { Date startDate = formatter.parse(startTime); long msStart = startDate.getTime(); Date endDate = formatter.parse(endTime); long msEnd = endDate.getTime(); seconds = ( msEnd-msStart ) / (1000*60*60) ; } catch (ParseException e) { e.printStackTrace(); } return seconds; }}

INFO [main] - 2019-10-26 15:27:00与2019-10-26 15:27:41之间差41秒 INFO [main] - 2019-9-31 00:00:00与2019-10-01 00:00:00之间差0秒 INFO [main] - 2019-9-32 00:00:00与2019-10-02 00:00:00之间差0秒 INFO [main] - 2019-9-30 15:27:00与2019-10-26 15:27:41之间差26天 INFO [main] - 2019-10-26 08:00:00与2019-10-26 15:41:41之间差7小时