比较两个NSDate类型的参数相差的时间差

+(NSInteger)getDaysFrom:(NSDate *)serverDate To:(NSDate *)endDate

{

NSCalendar *gregorian = [[NSCalendar alloc]

initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

[gregorian setFirstWeekday:2];

//去掉时分秒信息

NSDate *fromDate;

NSDate *toDate;

[gregorian rangeOfUnit:NSCalendarUnitDay startDate:&fromDate interval:NULL forDate:serverDate];

[gregorian rangeOfUnit:NSCalendarUnitDay startDate:&toDate interval:NULL forDate:endDate];

NSDateComponents *dayComponents = [gregorian components:NSCalendarUnitDay fromDate:fromDate toDate:toDate options:0];

return dayComponents.day;

}

//比较选择的开始时间和结束时间的大小

+(BOOL)ComparisonString:(NSString *)str1 andString:(NSString *)str2

{

// NSString *dateStr=@"2015-12-31 01:01:01";//传入时间

//1.获得时间

NSDate *senddate = [ NSDate date ];

NSDateFormatter *dateformatter = [[ NSDateFormatter alloc ] init];

[dateformatter setDateFormat : @"yyyy-MM-dd" ];

NSString *locationString = [dateformatter stringFromDate :senddate];

str2 = locationString;

NSArray *arrya1 = [str1 componentsSeparatedByString:@" " ];

str1 = arrya1.firstObject;

arrya1  = [str2 componentsSeparatedByString:@" " ];

str2 = arrya1.firstObject;

NSString *dateStr = [ NSString stringWithFormat:@"%@ 00:00:01",str1];

//传入时间

//将传入时间转化成需要的格式

NSDateFormatter *format = [[ NSDateFormatter alloc ] init];

[ format setDateFormat:@"yyyy-MM-dd HH:mm:ss" ];

NSDate *fromdate = [format dateFromString:dateStr];

NSTimeZone *fromzone = [ NSTimeZone systemTimeZone ];

NSInteger frominterval = [fromzone secondsFromGMTForDate: fromdate];

NSDate *fromDate = [fromdate  dateByAddingTimeInterval: frominterval];

NSLog(@"调的时间=%@",fromDate);

NSString *dateStr1 = [ NSString stringWithFormat : @"%@ 23:59:59",str2];

//传入时间

//将传入时间转化成需要的格式

NSDateFormatter *format1 = [[ NSDateFormatter alloc ] init ];

[format1 setDateFormat : @"yyyy-MM-dd HH:mm:ss" ];

NSDate *fromdate1 = [format1 dateFromString : dateStr1];

NSTimeZone *fromzone1 = [ NSTimeZone systemTimeZone ];

NSInteger frominterval1 = [fromzone1 secondsFromGMTForDate : fromdate1];

NSDate *fromDate1 = [fromdate1  dateByAddingTimeInterval : frominterval1];

NSLog(@"调的时间1=%@",fromDate1);

double intervalTime = [fromDate1 timeIntervalSinceReferenceDate ] - [fromDate timeIntervalSinceReferenceDate ];

long lTime = (long)intervalTime;

NSInteger iDays = lTime/60/60/24;

if (iDays <= 0 ) {

return NO;

}else{

return YES;

}

}

//感谢大神的代码，拷贝为了记录