两个时间的时间差

-(NSString*)timeIntervalFromNextTime:(NSString*)nextTime

nextTimeFormat:(NSString*)format1

ToCurrentTime:(NSString*)currentTime

currentTimeFormat:(NSString*)format2{

//下次时间

NSDateFormatter*dateFormatter1 = [[NSDateFormatteralloc]init];

dateFormatter1.dateFormat= format1;

NSDate*nextDate = [dateFormatter1dateFromString:nextTime];

//当前时间

NSDateFormatter*dateFormatter2 = [[NSDateFormatteralloc]init];

dateFormatter2.dateFormat= format2;

NSDate*currentDate = [dateFormatter2dateFromString:currentTime];

return[selftimeIntervalFromNextTime:nextDateToCurrentTime:currentDate];

}

-(NSString*)timeIntervalFromNextTime:(NSDate*)nextTime ToCurrentTime:(NSDate*)currentTime{

NSTimeZone*timeZone = [NSTimeZonesystemTimeZone];

//上次时间

NSDate*nextDate = [nextTimedateByAddingTimeInterval:[timeZonesecondsFromGMTForDate:nextTime]];

//当前时间

NSDate*currentDate = [currentTimedateByAddingTimeInterval:[timeZonesecondsFromGMTForDate:currentTime]];

//时间间隔

NSIntegerintevalTime = [nextDatetimeIntervalSinceReferenceDate]-[currentDatetimeIntervalSinceReferenceDate];

//秒、分、小时、天、月、年

NSIntegerminutes = intevalTime /60;

NSIntegerhours = intevalTime /60/60;

if(minutes <60)

{

if(minutes <0)

{

//为负数时，用一天的时间减去当前过去的时间。等于总分钟数

NSIntegerallMinutes = (minutes +24*60);

//当总分钟数小于60时，显示多少分钟后喝奶

if(allMinutes<60)

{

return[NSStringstringWithFormat:@"%ld分钟后\n需要喝奶",(long)allMinutes];

}

else

{

//大于60时，换算成小时来算。几个小时后喝奶

NSIntegerhours = (minutes +24*60)/60;

return[NSStringstringWithFormat:@"%ld小时后\n需要喝奶",(long)hours];

}

}

else

{

return[NSStringstringWithFormat:@"%ld分钟后\n需要喝奶",(long)minutes];

}

}

elseif(hours <24)

{

return[NSStringstringWithFormat:@"%ld小时后\n需要喝奶",(long)hours];

}

else{

}

return@"";

}