[Flutter] Flutter Time Difference

// 시간차 구하기
timeDifference() {
// 현재 시간 time now
DateTime now = DateTime.now();

// 오늘의 아침 9시 09:00
DateTime morningTime = DateTime(now.year, now.month, now.day, 9, 0, 0);

// 시간 차이 계산 time difference
Duration difference = now.difference(morningTime);

// 시간과 분으로 변환
int hours = difference.inHours;
int minutes = difference.inMinutes.remainder(60);

// 출력
if (difference.isNegative) {
print('현재 시간은 아침 9시 이전입니다.');
} else {
print('아침 9시와의 시간 차이는 $hours시간 $minutes분 입니다.');
}
}


This code calculates the time difference between the current time and 9:00 AM of the same day.

1. 
   Current time is retrieved using DateTime.now().
   
   
2. 
   Morning time (9:00 AM) is defined using DateTime with today’s date and 9:00 AM.
   
   
3. 
   Time difference is calculated using now.difference(morningTime), which returns a Duration.
   
   
4. 
   The hours and minutes are extracted from the Duration using inHours and inMinutes.remainder(60).
   
   
5. 
   The code checks if the difference is negative (meaning it's before 9:00 AM) and prints the appropriate message; otherwise, it displays the time difference in hours and minutes.
   

This way, you can see how long it has been since 9:00 AM or if it's before 9:00 AM.

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