iOS--NSData分类获取不同的时间

作者: Recorder_MZou | 来源:发表于2018-07-03 16:12 被阅读17次

基于常用的时间来说，我们平常需要获取的方式很多，而为了简单便捷获取时间方式，封装了以下一些方法，可直接写成NSData的分类，然后直接通过方法调用获取相关的时间方式。

获取当前时间的年月日如:2018-01-01.

/**
 *  获取年月日如:20180101.
 *
 *  @return 年月日如:20180101.
 */
- (NSString *)getFormatYearMonthDay
{
    NSString *string = [NSString stringWithFormat:@"%zd%zd%zd",[self getYear],[self getMonth],[self getDay]];
    return string;
}

2.获取当前时间的日期是当年的第几周

/**
 *  该前时间的日期是该年的第几周
 *
 *  @return 第几周
 */
- (int )getWeekOfYear
{
    int i;
    int year = (int)[self getYear];
    NSDate *date = [self endOfWeek];
    for (i = 1;[[date dateAfterDay:-7 * i] getYear] == year;i++)
    {
    }
    return i;
}

3.获取当前时间的日

/**
 *  获取当前时间的日
 *
 *  @return 返回当前时间的日
 */
- (NSUInteger)getDay
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dayComponents = [calendar components:(NSCalendarUnitDay) fromDate:self];
    return [dayComponents day];
}

4.获取当前时间的月

/**
 *  获取当前时间的月
 *
 *  @return 返回当前时间的月
 */
- (NSUInteger)getMonth
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dayComponents = [calendar components:(NSCalendarUnitMonth) fromDate:self];
    return [dayComponents month];
}

5.获取当前时间的年

/**
 *  获取前时间的年
 *
 *  @return 返回前时间的年
 */
- (NSUInteger)getYear
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dayComponents = [calendar components:(NSCalendarUnitYear) fromDate:self];
    return [dayComponents year];
}

6.获取当前时间的小时

/**
 *  获取前时间的小时
 *
 *  @return 返回前时间的小时
 */
- (int )getHour
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSCalendarUnitYear| NSCalendarUnitMonth | NSCalendarUnitDay |NSCalendarUnitHour |NSCalendarUnitMinute;
    NSDateComponents *components = [calendar components:unitFlags fromDate:self];
    NSInteger hour = [components hour];
    return (int)hour;
}

7.获取当前时间的分钟

/**
 *  获取前时间的分钟
 *
 *  @return 返回前时间的小时
 */
- (int)getMinute
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSUInteger unitFlags = NSCalendarUnitYear| NSCalendarUnitMonth | NSCalendarUnitDay |NSCalendarUnitHour |NSCalendarUnitMinute;
    NSDateComponents *components = [calendar components:unitFlags fromDate:self];
    NSInteger minute = [components minute];
    return (int)minute;
}

8.获取一周的第几天(周末为第一天)

/**
 *  获取一周的第几天(周末为第一天)
 *
 *  @return 返回一周的第几天(周末为第一天
 */
- (NSUInteger)weekday
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *weekdayComponents = [calendar components:(NSCalendarUnitWeekday) fromDate:self];
    return [weekdayComponents weekday];
}

9.格式化时间+格式化的类型(格式化String)

/**
 *  格式化时间+格式化的类型(格式化String)
 *
 *  @param string 需要格式化的String
 *  @param format 格式化格式 ：如@“yyyy-MM-dd hh-mm-ss”
 *
 *  @return 返回格式化后的时间的date
 */
+ (NSDate *)dateFromString:(NSString *)string withFormat:(NSString *)format
{
    NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
    [inputFormatter setDateFormat:format];
    NSDate *date = [inputFormatter dateFromString:string];
    return date;
}

格式化时间+格式化的类型(格式化NSData)

/**
 格式化类型

 @param format 格式化类型
 @return 返回格式化后的字符串
 */
- (NSString *)stringWithFormat:(NSString *)format {
    NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
    [outputFormatter setDateFormat:format];
    NSString *timestamp_str = [outputFormatter stringFromDate:self];
    return timestamp_str;
}

/**
 *  格式化时间+格式化的类型
 *
 *  @param date   需要格式化的Date
 *  @param format 格式化格式 ：如@“yyyy-MM-dd hh-mm-ss”
 *
 *  @return 返回格式化后的时间字符串
 */
+ (NSString *)stringFromDate:(NSDate *)date withFormat:(NSString *)format
{
    return [date stringWithFormat:format];
}

11.字符串时间格式化字符串时间 (String -> String)

/**
 *  字符串时间格式化字符串时间 (String -> String)
 *
 *  @param dateString          需要格式化的时间String
 *  @param dateStringFormatter 需要格式化的时间String的格式（必须与传进来的String的格式一致）yyyy-MM-dd HH:mm:ss  hh 为12小时制 HH 为24小时制
 *  @param formatter           格式化后的格式
 *
 *  @return 格式化后的时间
 */
+ (NSString *)stringFromString:(NSString *)dateString andDateStringFormatter:(NSString *)dateStringFormatter withFormatter:(NSString *)formatter
{

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:dateStringFormatter];
    NSDate *date1 = [dateFormatter dateFromString:dateString];
    NSDateFormatter *dateFormatter2 = [[NSDateFormatter alloc] init];
    [dateFormatter2 setDateFormat:formatter];
    NSString *strDate1 = [dateFormatter2 stringFromDate:date1];
    
    return strDate1;
}

12.添加时间作为前缀

/**
 *  添加时间作为前缀
 *
 *  @param date     时间date
 *  @param prefixed 是否前缀
 *
 *  @return 返回是否加了前缀的时间
 */
+ (NSString *)stringForDisplayFromDate:(NSDate *)date prefixed:(BOOL)prefixed
{
    
    
    NSDate *today = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *offsetComponents = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                                     fromDate:today];
    
    NSDate *midnight = [calendar dateFromComponents:offsetComponents];
    
    NSDateFormatter *displayFormatter = [[NSDateFormatter alloc] init];
    NSString *displayString = nil;
    
    // comparing against midnight
    if ([date compare:midnight] == NSOrderedDescending) {
        if (prefixed) {
            [displayFormatter setDateFormat:@"'at' h:mm a"]; // at 11:30 am
        } else {
            [displayFormatter setDateFormat:@"h:mm a"]; // 11:30 am
        }
    } else {
        // check if date is within last 7 days
        NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
        [componentsToSubtract setDay:-7];
        NSDate *lastweek = [calendar dateByAddingComponents:componentsToSubtract toDate:today options:0];
        if ([date compare:lastweek] == NSOrderedDescending) {
            [displayFormatter setDateFormat:@"EEEE"]; // Tuesday
        } else {
            // check if same calendar year
            NSInteger thisYear = [offsetComponents year];
            
            NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                                           fromDate:date];
            NSInteger thatYear = [dateComponents year];
            if (thatYear >= thisYear) {
                [displayFormatter setDateFormat:@"MMM d"];
            } else {
                [displayFormatter setDateFormat:@"MMM d, yyyy"];
            }
        }
        if (prefixed) {
            NSString *dateFormat = [displayFormatter dateFormat];
            NSString *prefix = @"'on' ";
            [displayFormatter setDateFormat:[prefix stringByAppendingString:dateFormat]];
        }
    }
    
    // use display formatter to return formatted date string
    displayString = [displayFormatter stringFromDate:date];
    return displayString;
}

13.获取以周一为第一天开始的时间

/**
 *  获取以周一为第一天开始的时间
 *
 *  @return 返回周一的的开始时间
 */
- (NSDate *)beginningOfWeek
{
    // largely borrowed from "Date and Time Programming Guide for Cocoa"
    // we'll use the default calendar and hope for the best
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *beginningOfWeek = nil;
    calendar.firstWeekday = 2;

    // couldn't calc via range, so try to grab Sunday, assuming gregorian style
    // Get the weekday component of the current date
    NSDateComponents *weekdayComponents = [calendar components:NSCalendarUnitWeekday fromDate:self];
    
    
    NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
    [componentsToSubtract setDay: 0 - ([weekdayComponents weekday] - 2)];
    beginningOfWeek = nil;
    beginningOfWeek = [calendar dateByAddingComponents:componentsToSubtract toDate:self options:0];
    
    //normalize to midnight, extract the year, month, and day components and create a new date from those components.
    NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                               fromDate:beginningOfWeek];
    return [calendar dateFromComponents:components];
}

14.获取某天后的日期(若day为负数,则为|day|天前的日期)

/**
 *  获取某天后的日期(若day为负数,则为|day|天前的日期)
 *
 *  @param day 某天
 *
 *  @return 返回day天后的日期(若day为负数,则为|day|天前的日期)
 */
- (NSDate *)dateAfterDay:(int)day
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    // Get the weekday component of the current date
    // NSDateComponents *weekdayComponents = [calendar components:NSWeekdayCalendarUnit fromDate:self];
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];
    // to get the end of week for a particular date, add (7 - weekday) days
    [componentsToAdd setDay:day];
    NSDate *dateAfterDay = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0];
    
    return dateAfterDay;
}

15.获取某个月后的日期

/**
 *  获取某个月后的日期
 *
 *  @param month 某个月
 *
 *  @return 某个月个月后的日期
 */
- (NSDate *)dateafterMonth:(int)month
{
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init];
    [componentsToAdd setMonth:month];
    NSDate *dateAfterMonth = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0];
    
    return dateAfterMonth;
}

16.获取当前月的第一天

/**
 *  获取当前月的第一天
 *
 *  @return 返回该月的第一天
 */
- (NSDate *)beginningOfMonth 
{ 
    return [self dateAfterDay:(int)(-[self getDay] + 1)];
}

17.获取该月的最后一天

/**
 *  获取该月的最后一天
 *
 *  @return 该月的最后一天
 */
- (NSDate *)endOfMonth 
{ 
    return [[[self beginningOfMonth] dateafterMonth:1] dateAfterDay:-1]; 
}

18.获取当前周的周末的时间

/**
 *  获取当前周的周末
 *
 *  @return 当前周的周末
 */
- (NSDate *)endOfWeek
{
    NSCalendar *calendar = [NSCalendar currentCalendar]; 
    // Get the weekday component of the current date 
    NSDateComponents *weekdayComponents = [calendar components:NSCalendarUnitWeekday fromDate:self]; 
    NSDateComponents *componentsToAdd = [[NSDateComponents alloc] init]; 
    // to get the end of week for a particular date, add (7 - weekday) days 
    [componentsToAdd setDay:(7 - [weekdayComponents weekday])]; 
    NSDate *endOfWeek = [calendar dateByAddingComponents:componentsToAdd toDate:self options:0]; 
    
    return endOfWeek; 
}

19.获取当前时间的上一个月的时间

/**
 *  获取上一个月的时间
 */
+ (NSString *)getLastMonth
{
    NSDate *currentDate = [NSDate date];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM"];
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *lastMonthComps = [[NSDateComponents alloc] init];
    //    [lastMonthComps setYear:1]; // year = 1表示1年后的时间 year = -1为1年前的日期，month day 类推
    [lastMonthComps setMonth:-1];
    NSDate *newdate = [calendar dateByAddingComponents:lastMonthComps toDate:currentDate options:0];
    NSString *dateStr = [formatter stringFromDate:newdate];
//    NSLog(@"date str = %@", dateStr);
    return dateStr;
}

20.获取距离当前月的某个月份时间

/**
 *  获取距离当前月的某个月份
 *
 *  @param distanceMonth 距离当前月的月份 负数是前多少个月  ，正数为后几个月
 *
 *  @return 距离当前月的某个月份
 */
+ (NSString *)getDistanceCurrentMonthWhichMonth:(int)distanceMonth
{
    NSDate *currentDate = [NSDate date];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM"];
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *lastMonthComps = [[NSDateComponents alloc] init];
    //    [lastMonthComps setYear:1]; // year = 1表示1年后的时间 year = -1为1年前的日期，month day 类推
    [lastMonthComps setMonth:distanceMonth];
    NSDate *newdate = [calendar dateByAddingComponents:lastMonthComps toDate:currentDate options:0];
    NSString *dateStr = [formatter stringFromDate:newdate];
    //    NSLog(@"date str = %@", dateStr);
    return dateStr;
}

21.获取距离当前时间后的某个小时

/**
 *  获取距离当前时间后的某个小时
 *
 *  @param distanceHours 距离当前时间的小时数 负数是前多少个小时  ，正数为后几个小时
 *
 *  @return 距离当前月的某个月份
 */
+ (NSString *)getDistanceCurrentHourWhichHour:(int)distanceHours
{
    NSDate *currentDate = [NSDate date];
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:@"yyyy-MM-dd HH:mm"];
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *lastHourComps = [[NSDateComponents alloc] init];
    //    [lastMonthComps setYear:1]; // year = 1表示1年后的时间 year = -1为1年前的日期，month day 类推
    [lastHourComps setHour:distanceHours];
    NSDate *newdate = [calendar dateByAddingComponents:lastHourComps toDate:currentDate options:0];
    NSString *dateStr = [formatter stringFromDate:newdate];
    //    NSLog(@"date str = %@", dateStr);
    return dateStr;
}

22.获取距离某个时间后的某个小时

/**
 *  获取距离某个时间后的某个小时
 *
 *  @param date 当前时间
 *  @param distanceHours 距离当前时间的小时数 负数是前多少个小时  ，正数为后几个小时
 *  @param formatterString 时间类型
 *
 *  @return 距离当前月的某个月份
 */
+ (NSString *)getDistanceCurrentHourWithDate:(NSDate *)date andWhichHours:(int)distanceHours withFormatterString:(NSString *)formatterString
{
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    [formatter setDateFormat:formatterString];
    
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *lastHourComps = [[NSDateComponents alloc] init];
    //    [lastMonthComps setYear:1]; // year = 1表示1年后的时间 year = -1为1年前的日期，month day 类推
    [lastHourComps setHour:distanceHours];
    NSDate *newdate = [calendar dateByAddingComponents:lastHourComps toDate:date options:0];
    NSString *dateStr = [formatter stringFromDate:newdate];
    //    NSLog(@"date str = %@", dateStr);
    return dateStr;
}

23.获取指定月的第一天的时间

/**
 *  获取指定月的第一天的时间
 *
 *  @param dateStr 指定月的字符串
 *
 *  @return 指定月的第一天
 */
+ (NSString *)getMonthBeginWith:(NSString *)dateStr
{
    
    NSDateFormatter *format=[[NSDateFormatter alloc] init];
    [format setDateFormat:@"yyyy-MM"];
    NSDate *newDate=[format dateFromString:dateStr];
    double interval = 0;
    NSDate *beginDate = nil;
    NSDate *endDate = nil;
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    [calendar setFirstWeekday:2];//设定周一为周首日
    BOOL ok = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:&beginDate interval:&interval forDate:newDate];
    //分别修改为 NSDayCalendarUnit NSWeekCalendarUnit NSYearCalendarUnit
    if (ok) {
        endDate = [beginDate dateByAddingTimeInterval:interval-1];
    }else {
        return @"";
    }
    NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
    [myDateFormatter setDateFormat:@"dd"];
    NSString *beginString = [myDateFormatter stringFromDate:beginDate];
    return [NSString stringWithFormat:@"%@-%@",dateStr,beginString];;
}

24.获取指定月的最后一天的时间

/**
 *  获取指定月的最后一天的时间
 *
 *  @param dateStr 指定月的字符串
 *
 *  @return 指定月的最后一天
 */
+ (NSString *)getMonthEndWith:(NSString *)dateStr
{
    
    NSDateFormatter *format=[[NSDateFormatter alloc] init];
    [format setDateFormat:@"yyyy-MM"];
    NSDate *newDate=[format dateFromString:dateStr];
    double interval = 0;
    NSDate *beginDate = nil;
    NSDate *endDate = nil;
    NSCalendar *calendar = [NSCalendar currentCalendar];
    
    [calendar setFirstWeekday:2];//设定周一为周首日
    BOOL ok = [calendar rangeOfUnit:NSCalendarUnitMonth startDate:&beginDate interval:&interval forDate:newDate];
//    分别修改为 NSDayCalendarUnit NSWeekCalendarUnit NSYearCalendarUnit
    if (ok) {
        endDate = [beginDate dateByAddingTimeInterval:interval-1];
    }else {
        return @"";
    }
    NSDateFormatter *myDateFormatter = [[NSDateFormatter alloc] init];
    [myDateFormatter setDateFormat:@"dd"];
    NSString *endString = [myDateFormatter stringFromDate:endDate];
    return [NSString stringWithFormat:@"%@-%@",dateStr,endString];
}

25.获取两个日期之间的天数差

/**
 *  获取两个日期之间的天数差
 *
 *  @param fromDate 起始日期
 *  @param toDate   终止日期
 *
 *  @return 总天数
 */
+ (NSInteger)numberOfDaysWithFromDate:(NSDate *)fromDate toDate:(NSDate *)toDate
{
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    
    NSDateComponents    * comp = [calendar components:NSCalendarUnitDay
                                             fromDate:fromDate
                                               toDate:toDate
                                              options:NSCalendarWrapComponents];
    return comp.day;
}

26.获取两个日期之间的小时差

/**
 *  获取两个日期之间的小时差
 *
 *  @param fromDate 起始日期
 *  @param toDate   终止日期
 *
 *  @return 总相差小时
 */
+ (NSInteger)numberOfHourWithFromDate:(NSString *)fromDateString toDate:(NSString *)toDateString WithFormatterString:(NSString *)formatterString
{
    // 2.将时间转换为date
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
    formatter.dateFormat = formatterString;
    NSDate *date1 = [formatter dateFromString:fromDateString];
    NSDate *date2 = [formatter dateFromString:toDateString];
    // 3.创建日历
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSCalendarUnit type = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute | NSCalendarUnitSecond;
    // 4.利用日历对象比较两个时间的差值
    NSDateComponents *cmps = [calendar components:type fromDate:date1 toDate:date2 options:0];
    // 5.输出结果
    NSLog(@"两个时间相差%ld年%ld月%ld日%ld小时%ld分钟%ld秒", (long)cmps.year, (long)cmps.month, (long)cmps.day, (long)cmps.hour, (long)cmps.minute, (long)cmps.second);
    NSInteger hours = cmps.hour + cmps.day * 24 + cmps.month * 30 * 24 +cmps.year * 365 *30 *24;
    
    return hours;
}

27.获取两个日期之间的分钟差

/**
 *  获取两个日期之间的分钟差
 *
 *  @param fromDate 起始日期
 *  @param toDate   终止日期
 *
 *  @return 总相差分
 */
+ (NSInteger)numberOfMinWithFromDate:(NSDate *)fromDate toDate:(NSDate *)toDate
{
    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    
    NSDateComponents    * comp = [calendar components:NSCalendarUnitDay
                                             fromDate:fromDate
                                               toDate:toDate
                                              options:NSCalendarWrapComponents];
    return comp.minute;
}

28.判断某个时间段是否为今天

/**
 *  判断某个时间段是否为今天
 *
 *  @param dateString 某个时间段
 *
 *  @return 是否是今天 YES:今天   NO:不是今天
 */
+ (BOOL)isTodayWithDateString:(NSString *)dateString
{
    //now: 2015-09-05
    //self 调用这个方法的对象本身
    
    NSString *str = dateString;
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd"];
    NSDate *date = [dateFormatter dateFromString:str];
    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    int unit = NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear ;
    
    //1.获得当前时间的 年月日
    NSDateComponents *nowCmps = [calendar components:unit fromDate:[NSDate date]];
    
    //2.获得self
    NSDateComponents *selfCmps = [calendar components:unit fromDate:date];
    
    return (selfCmps.year == nowCmps.year) && (selfCmps.month == nowCmps.month) && (selfCmps.day == nowCmps.day);
}

29.比较两个时间段的大小

/**
 *  比较两个时间段的大小
 *
 *  @param dateStr01 时间段1
 *  @param dateStr02 时间段2
 *  @param formatter 格式
 *
 *  @return 1: 时间段1 < 时间段2   0: 时间段1 = 时间段2   -1: 时间段1 > 时间段2
 */
+ (int)compareStringDate:(NSString*)dateStr01 withStringDate:(NSString*)dateStr02 withFormatter:(NSString *)formatter
{
    int different;
    NSDateFormatter *df = [[NSDateFormatter alloc]init];
    [df setDateFormat:formatter];
    NSDate *dt1 = [[NSDate alloc]init];
    NSDate *dt2 = [[NSDate alloc]init];
    dt1 = [df dateFromString:dateStr01];
    dt2 = [df dateFromString:dateStr02];
    NSComparisonResult result = [dt1 compare:dt2];
    switch (result)
    {
            //date02比date01大
        case NSOrderedAscending: different = 1;
            break;
            //date02比date01小
        case NSOrderedDescending: different = -1;
            break;
            //date02=date01
        case NSOrderedSame: different=0;
            break;
        default: NSLog(@"erorr dates %@, %@", dt2, dt1);
            break;
    }
    return different;
}

以上是对于NSData的分类一些方法进行相关封装，在NSData中对时间的处理，更加看重的是对时间的格式化之余需要注意时间相关的格式，只有统一的格式才能进行计算和进行比较，否则会导致程序报错，直接崩溃。如有什么不明之处欢迎交流，也欢迎大家指出相关的错误点。

大千世界，求同存异；相遇是缘，相识是份，相知便是“猿粪”(缘分)
From MZou

iOS--NSData分类获取不同的时间

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