回答編集履歴

1 コード追加

tkturbo score 5166

2016/02/25 16:28  投稿

日付差分だけならdifferenceDaysの中身がこんな感じでいかが？

```java

Calendar cal1 = Calendar.getInstance();

cal1.setTime(date1);

Calendar cal2 = Calendar.getInstance();

cal2.setTime(date2);

long longtime1 = c2.getTimeInMillis();

while(cal1.after(cal2)){

longtime1 = cal1.getTimeInMillis();

cal1.add(Calendar.MONTH, -1);

}

cal1.setTimeInMillis(longtime1);

cal1.add(Calendar.DATE, -1 * cal2.get(Calendar.DATE);

return (int)cal1.get(Calendar.DATE);

return (int)cal1.get(Calendar.DATE);

```

【追記】

年月日時分秒で差を求めるのだと下記のような感じになるかな？

```java

Calendar c1 = Calendar.getInstance();

c1.setTime(date1);

Calendar c2 = Calendar.getInstance();

c2.setTime(date2);

// millisecond

c1.set(Calendar.MILLISECOND, 0);

c2.set(Calendar.MILLISECOND, 0);

// second

int sec = c1.get(Calendar.SECOND) - c2.get(Calendar.SECOND);

sec += (sec < 0) ? 60 : 0;

c1.add(Calendar.SECOND, -1 * sec);

// minute

int min = c1.get(Calendar.MINUTE) - c2.get(Calendar.MINUTE);

min += (min < 0) ? 60 : 0;

c1.add(Calendar.MINUTE, -1 * min);

// hour

int hour = c1.get(Calendar.HOUR) - c2.get(Calendar.HOUR);

hour += (hour < 0) ? 24 : 0;

c1.add(Calendar.HOUR, -1 * hour);

// day

long longtime1 = c1.getTimeInMillis();

c1.set(Calendar.DATE, 1);

c1.add(Calendar.DATE, -1);

int dayInLastMonth = c1.get(Calendar.DATE);

c1.setTimeInMillis(longtime1);

int day = c1.get(Calendar.DATE) - c2.get(Calendar.DATE);

day += (day < 0) ? dayInLastMonth : 0;

c1.add(Calendar.DATE, -1 * day);

// month

int month = c1.get(Calendar.MONTH) - c2.get(Calendar.MONTH);

month += (month < 0) ? 12 : 0;

c1.add(Calendar.MONTH, -1 * month);

// year

int year = c1.get(Calendar.YEAR) - c2.get(Calendar.YEAR);

```