public static double dateDiffDays(String startTime, String endTime,
String format, String str) {
// 按照传入的格式生成一个simpledateformate对象
SimpleDateFormat sd = new SimpleDateFormat(format);
long nd = 1000 * 24 * 60 * 60;// 一天的毫秒数
long nh = 1000 * 60 * 60;// 一小时的毫秒数
long nm = 1000 * 60;// 一分钟的毫秒数
long ns = 1000;// 一秒钟的毫秒数
long diff;
long day = 0;
long hour = 0;
long min = 0;
long sec = 0;
// 获得两个时间的毫秒时间差异
try {
diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime();
day = diff / nd;// 计算差多少天
hour = diff % nd / nh + day * 24;// 计算差多少小时
min = diff % nd % nh / nm + day * 24 * 60;// 计算差多少分钟
sec = diff % nd % nh % nm / ns;// 计算差多少秒
// 输出结果
System.out.println("时间相差：" + day + "天" + (hour - day * 24) + "小时"
+ (min - day * 24 * 60) + "分钟" + sec + "秒。");
System.out.println("hour=" + hour + ",min=" + min);
if((hour - day * 24)<5){
// 半天
return day+0.5;
}else{
// 整天
return day+1;
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}