How many days, hours, minutes and seconds do the two times differ for ios_Intefrankly

How many days, hours, minutes and seconds do the two times differ for ios

Today used a time class, previously written but can not find a moment in this record to facilitate future viewing.

```/**
How many days, hours, minutes and seconds are the difference between the two times

@param startTime  Start time
@param endTime  Closing time
@return  Time difference
*/
+ (NSString *)dateTimeDifferenceWithStartTime:(NSString *)startTime endTime:(NSString *)endTime
{

NSDateFormatter *date = [[NSDateFormatter alloc]init];
[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *startDate =[date dateFromString:startTime];
NSDate *endDdate = [date dateFromString:endTime];

NSTimeInterval startInterval = [startDate timeIntervalSince1970]*1;
NSTimeInterval endInterval = [endDdate timeIntervalSince1970]*1;
NSTimeInterval value = endInterval - startInterval;

//  day
int day = (int)value / (24 *3600);
//  hours
int house = (int)value / (24 *3600)%3600;
//  a point (in sports or games)
int minute = (int)value /60%60;
//  second
int second = (int)value %60;

NSString *timeStr;

if (day != 0) {
timeStr = [NSString stringWithFormat:@"%d day%d hours%d a point (in sports or games)%d second",day,house,minute,second];
}
else if (day==0 && house !=0) {
timeStr = [NSString stringWithFormat:@"%d hours%d a point (in sports or games)%d second",house,minute,second];
}
else if (day==0 && house==0 && minute!=0) {
timeStr = [NSString stringWithFormat:@"%d a point (in sports or games)%d second",minute,second];
}
else{
timeStr = [NSString stringWithFormat:@"%d second",second];
}

return timeStr;
}```

Method II

```- (NSString *)dateTimeDifferenceWithStartTime:(NSString *)startTime endTime:(NSString *)endTime
{
NSDateFormatter *date = [[NSDateFormatter alloc]init];
[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *startDate =[date dateFromString:startTime];
NSDate *endDdate = [date dateFromString:endTime];

NSCalendar *cal = [NSCalendar currentCalendar];
unsigned int unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
NSDateComponents *dateComponents = [cal components:unitFlags fromDate:startDate toDate:endDdate options:0];

//  day
NSInteger day = [dateComponents day];
//  hours
NSInteger house = [dateComponents hour];
//  a point (in sports or games)
NSInteger minute = [dateComponents minute];
//  second
NSInteger second = [dateComponents second];

NSString *timeStr;

if (day != 0) {
timeStr = [NSString stringWithFormat:@"%zd day%zd hours%zd a point (in sports or games)%zd second",day,house,minute,second];
}
else if (day==0 && house !=0) {
timeStr = [NSString stringWithFormat:@"%zd hours%zd a point (in sports or games)%zd second",house,minute,second];
}
else if (day==0 && house==0 && minute!=0) {
timeStr = [NSString stringWithFormat:@"%zd a point (in sports or games)%zd second",minute,second];
}
else{
timeStr = [NSString stringWithFormat:@"%zd second",second];
}

return timeStr;
}```

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