NSDate *nowDate = [NSDate date];

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

dateFomatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";

// 截止時(shí)間字符串格式

NSString *expireDateStr = @"2017-04-22 15:33:57";

// 當(dāng)前時(shí)間字符串格式

NSString *nowDateStr = [dateFomatter stringFromDate:nowDate];

// 截止時(shí)間data格式

NSDate *expireDate = [dateFomatter dateFromString:expireDateStr];

// 當(dāng)前時(shí)間data格式

nowDate = [dateFomatter dateFromString:nowDateStr];

// 當(dāng)前日歷

NSCalendar *calendar = [NSCalendar currentCalendar];

// 需要對比的時(shí)間數(shù)據(jù)

NSCalendarUnit unit = NSCalendarUnitYear | NSCalendarUnitMonth

| NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;

// 對比時(shí)間差

NSDateComponents *dateCom = [calendar components:unit fromDate:expireDate toDate:nowDate options:0];

// 差值

NSLog(@"年差額 = %ld, 月差額 = %ld, 日差額 = %ld, 小時(shí)差額 = %ld, 分鐘差額 = %ld, 秒差額 = %ld", (long)dateCom.year,(long)dateCom.month,(long)dateCom.day,(long)dateCom.hour,(long)dateCom.minute,(long)dateCom.second);