计算两个日期之间相差的天数
import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class test16 {/** * @param args * @throws ParseException */public static void main(String[] args) throws ParseException {// TODO Auto-generated method stubSimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date d1=sdf.parse("2012-09-08 10:10:10");Date d2=sdf.parse("2012-09-15 00:00:00");System.out.println(daysBetween(d1,d2));System.out.println(daysBetween("2012-09-08 10:10:10","2012-09-15 00:00:00"));}/** * 计算两个日期之间相差的天数 * @param smdate 较小的时间 * @param bdate 较大的时间 * @return 相差天数 * @throws ParseException */ public static int daysBetween(Date smdate,Date bdate) throws ParseException { SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); smdate=sdf.parse(sdf.format(smdate)); bdate=sdf.parse(sdf.format(bdate)); Calendar cal = Calendar.getInstance(); cal.setTime(smdate); long time1 = cal.getTimeInMillis(); cal.setTime(bdate); long time2 = cal.getTimeInMillis(); long between_days=(time2-time1)/(1000*3600*24); return Integer.parseInt(String.valueOf(between_days)); } /***字符串的日期格式的计算*/ public static int daysBetween(String smdate,String bdate) throws ParseException{ SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); Calendar cal = Calendar.getInstance(); cal.setTime(sdf.parse(smdate)); long time1 = cal.getTimeInMillis(); cal.setTime(sdf.parse(bdate)); long time2 = cal.getTimeInMillis(); long between_days=(time2-time1)/(1000*3600*24); return Integer.parseInt(String.valueOf(between_days)); }}
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