我已经实现了以下代码来计算剩余天数。我使用 SimpleDateFormat 将字符串转换为日期。如果我输入 10/02/1993(今天的日期)作为日期,输出显示还剩 0 天。但是如果我选择 11/02/1993,它会显示与剩余 0 天相同的输出。但是,如果我更改月份,即 22/07/1993,它会显示剩余 160 天,而不是原始结果的 162 天。我在这里做错了什么?任何帮助是极大的赞赏。
private static void calculateNextBirthday() {
Scanner in = new Scanner(System.in);
System.out.println("Enter your birthday(dd/MM/yyyy)");
user_input = in.nextLine();
SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
Calendar user_selected_day = new GregorianCalendar();
Calendar today = new GregorianCalendar();
Date selected_date = null;
try {
selected_date = formatter.parse(user_input);
} catch (ParseException e) {
e.printStackTrace();
}
user_selected_day.setTime(selected_date);
int user_selected_month = user_selected_day.get(Calendar.MONTH);
int CMonth = today.get(Calendar.MONTH);
int user_selected_date = user_selected_day.get(Calendar.DAY_OF_MONTH);
int CDate = today.get(Calendar.DAY_OF_MONTH);
user_selected_day.set(Calendar.YEAR, today.get(Calendar.YEAR));
user_selected_day.set(Calendar.DAY_OF_WEEK,today.get(Calendar.DAY_OF_WEEK));
if (user_selected_month < CMonth) {
user_selected_day.set(Calendar.YEAR,today.get(Calendar.YEAR) + 1);
}
else if (user_selected_month == CMonth){
if(user_selected_date < CDate){
user_selected_day.set(Calendar.YEAR,today.get(Calendar.YEAR) + 1);
}
}
long millis = user_selected_day.getTimeInMillis() - today.getTimeInMillis();
long days;
days = (millis / (24 * 60 * 60 * 1000));
System.out.println(String.valueOf(days) + " days left!!");
}
UPDATE : I have updated the Code below and it works fine. Hope it helps someone in the future.
` SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
Calendar user_selected_day = new GregorianCalendar();
Calendar today = new GregorianCalendar();
Date selected_date = null;
try {
selected_date = formatter.parse(plainDate);
} catch (ParseException e) {
e.printStackTrace();
}
user_selected_day.setTime(selected_date);
int user_selected_month = user_selected_day.get(Calendar.MONTH);
int CMonth = today.get(Calendar.MONTH);
int user_selected_date = user_selected_day.get(Calendar.DAY_OF_MONTH);
int CDate = today.get(Calendar.DAY_OF_MONTH);
user_selected_day.set(Calendar.YEAR, today.get(Calendar.YEAR));
user_selected_day.set(Calendar.HOUR_OF_DAY,today.get(Calendar.HOUR_OF_DAY));
user_selected_day.set(Calendar.MINUTE,today.get(Calendar.MINUTE));
user_selected_day.set(Calendar.SECOND,today.get(Calendar.SECOND));
user_selected_day.set(Calendar.MILLISECOND,today.get(Calendar.MILLISECOND));
if (user_selected_month < CMonth) {
user_selected_day.set(Calendar.YEAR,today.get(Calendar.YEAR) + 1);
}
else if (user_selected_month == CMonth){
if(user_selected_date < CDate){
user_selected_day.set(Calendar.YEAR,today.get(Calendar.YEAR) + 1);
}
}
long millis = user_selected_day.getTimeInMillis() - today.getTimeInMillis();
long days;
if(user_selected_day.getTime()==today.getTime()){
days = 0;
}
else{
days = (millis / (24 * 60 * 60 * 1000));
}`
最佳答案
问题出在行上
user_selected_day.set(Calendar.YEAR, today.get(Calendar.YEAR));
这会将今天日期的年份设置为 user_selected
日,并且由于月份相等,它将进入 elseif 并在不进行任何更改的情况下退出。
还要检查您提到的 if else 条件。
关于java - java剩余天数计算,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28429853/