代码语言：javascript复制
/**
* 计算两个日期的相隔天数
* @author shijing
* 2015年9月6日下午5:14:54
* @param date1
* @param date2
* @return
*/
public static int daysBetween(Date date1,Date date2){
Calendar cal = Calendar.getInstance();
cal.setTime(date1);
long time1 = cal.getTimeInMillis();
cal.setTime(date2);
long time2 = cal.getTimeInMillis();
long between_days=(time2-time1)/(1000*3600*24);
return Integer.parseInt(String.valueOf(between_days));
}
/**
* 返回一个月有多少天
* @author shijing
* 2015年9月6日下午5:15:18
* @param datetime
* @return
*/
public static String getDayByMonth(String datetime){
StringBuffer buffer = new StringBuffer();
SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MM");
Calendar calendar = new GregorianCalendar();
try {
Date date = sdf.parse(datetime);
calendar.setTime(date);
int day = calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
if(day < 10){
buffer = buffer.append("0").append(String.valueOf(day));
}else{
buffer = buffer.append(String.valueOf(day));
}
} catch (ParseException e) {
e.printStackTrace();
}
return buffer.toString();
} 可直接写在日期工具类里面
