NSDate日期类封装大全

日期类的处理在项目中是常用部分，花时间把常用到的封装了一下，一次性搞定。

具体功能如下：

/**
 *  日期相关工具宏
 */

#import "SYKFDateUitil.h"

/**
 *  获取当前日历
 */
#define SYKFDateCurrentCalendar [SYKFDateUitil sharedCalendar]

/**
 *  获取单例格式化器
 */
#define SYKFDateShareFormatter [SYKFDateUitil sharedDateFormatter]

/**
 *  相对现在日期得间隔天数
 */
#define SYKFDateDaysAgo(aDate) [SYKFDateUitil daysAgoFromNow:aDate]

/**
 *  不以午夜为基准计算天数之前
 */
#define SYKFDateDaysAgoAgainstMidNight(aDate) [SYKFDateUitil daysAgoAgainstMidnight:aDate]

/**
 *  获取一个时间与当前时间间隔详情字符串
 */
#define SYKFDateTimeAgoString(aDate) [SYKFDateUitil detailTimeAgoString:aDate]

/**
 *  获取一个时间戳与当前时间的间隔详情字符串
 */
#define SYKFDateTimeAgoStringByTimeInterval(timeInterval) [SYKFDateUitil detailTimeAgoStringByInterval:timeInterval]

/**
 *  天数间隔文本字符串
 */
#define SYKFDateStringDaysAgo(aDate) [SYKFDateUitil stringDaysAgo:aDate]

/**
 *  这个日期是星期几
 */
#define SYKFDateGetWeekDay(aDate) [SYKFDateUitil weekDay:aDate]

/**
 *  返回这个日期是星期几字符串
 */
#define  SYKFDateGetWeekDayString(aDate) [SYKFDateUitil weekDayString:aDate]

/**
 *  返回这个日期在全年中是第多少周字符串
 */
#define  SYKFDateGetWeekNumString(aDate) [SYKFDateUitil weekNumberString:aDate]

/**
 *  在全年中是第多少周
 */
#define SYKFDateGetWeekNum(aDate) [SYKFDateUitil weekNumber:aDate]

/**
 *  获取日期中得年份
 */
#define SYKFDateGetYear(aDate) [SYKFDateUitil year:aDate]

/**
 *  获取日期中得月份
 */
#define SYKFDateGetMonth(aDate) [SYKFDateUitil month:aDate]

/**
 *  获取日期中的日
 */
#define SYKFDateGetDay(aDate) [SYKFDateUitil day:aDate]

/**
 *  获取日期中得小时
 */
#define SYKFDateGetHour(aDate) [SYKFDateUitil hour:aDate]

/**
 *  获取日期中的分钟
 */
#define SYKFDateGetMinute(aDate) [SYKFDateUitil minute:aDate]

/**
 *  日期转字符串
 */
#define SYKFDateToString(aDate) [SYKFDateUitil stringFromDate:aDate]

/**
 *  字符串转日期
 */
#define SYKFDateFromString(aString) [SYKFDateUitil dateFromString:aString]

/**
 *  字符串转日期详细时间
 */
#define SYKFDateTimeFromString(aString) [SYKFDateUitil dateTimeFromString:aString]

/**
 *  将时间戳转成日期
 */
#define SYKFDateFromTimeInterval(timeInterval) [SYKFDateUitil dateFromTimeInterval:timeInterval]

/**
 *  按照某个格式将日期转成字符串
 */
#define SYKFDateToStringByFormat(aDate,format) [SYKFDateUitil stringFromDate:aDate withFormat:format]

/**
 *  按照某个格式将字符串转成日期
 */
#define SYKFDateFromStringByFormat(aString,format) [SYKFDateUitil dateFromString:aString withFormat:format]

/**
 *  这个日期所在周的起始日期
 */
#define SYKFDateBeginningOfWeek(aDate) [SYKFDateUitil beginningOfWeek:aDate]

/**
 *  这个日期的起始时间
 */
#define SYKFDateBeginningOfDay(aDate) [SYKFDateUitil beginningOfDay:aDate]

/**
 *  这个日期所在周的结束日期
 */
#define SYKFDateEndOfWeek(aDate) [SYKFDateUitil endOfWeek:aDate]

/**
 *  普通日期格式字符串
 */
#define SYKFDateFormatString [SYKFDateUitil dateFormatString]

/**
 *  普通时间格式字符串
 */
#define SYKFDateTimeFormatString [SYKFDateUitil timeFormatString]

/**
 *  时间戳格式字符串
 */
#define SYKFDateTimeStampFormatString [SYKFDateUitil timestampFormatString]

/**
 *  数据库存储格式字符串
 */
#define SYKFDateDataBaseFormatString [SYKFDateUitil dbFormatString]

/**
 *  生日转年龄
 */
#define SYKFDateBirthDayToAge(date) [SYKFDateUitil birthdayToAge:date]

/**
 *  生日转年龄
 */
#define SYKFDateBirthDayToAgeByTimeInterval(timeInterval) [SYKFDateUitil birthdayToAgeByTimeInterval:timeInterval]

/**
 *  日期转星座
 */
#define SYKFDateToConstellation(date) [SYKFDateUitil dateToConstellation:date]

/**
 *  时间戳转星座
 */
#define SYKFDateToConstellationByTimeInterval(timeInterval) [SYKFDateUitil dateToConstellationByTimeInterval:timeInterval]

/**
 *  检查一个对象是否为空
 */
#define SYKFCheckObjectNull(object) [SYKFDateUitil isNullObject: object]

/**
 *  检查一个valueObj,keyObj对象是否有一个是空的
 */
#define SYKFCheckKeyValueHasNull(keyObj,valueObj) [SYKFDateUitil checkValue:valueObj key:keyObj]

/**
 *  判断是否是今日
 */
#define SYKFBoolIfIsToday(string) [SYKFDateUitil boolIfIsToday:string]

           

好吧，具体实现代码：

+ (NSCalendar *)sharedCalendar
{
    NSCalendar *currentCalendar = [NSCalendar currentCalendar];
    [currentCalendar setTimeZone:[NSTimeZone systemTimeZone]];
    [currentCalendar setFirstWeekday:2];
    return currentCalendar;
}

+ (NSDateFormatter *)sharedDateFormatter
{
    static NSDateFormatter *_sykfDateFormatter = nil;
    static dispatch_once_t onceToken;
    
    SYKFDispatchOnce(onceToken, ^{
        
        if (!_sykfDateFormatter) {
            _sykfDateFormatter = [[NSDateFormatter alloc]init];
        }
    });
    return _sykfDateFormatter;
}

+ (NSString *)detailTimeAgoString:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    long long timeNow = [date timeIntervalSince1970];
    NSCalendar * calendar=[SYKFDateUitil sharedCalendar];
    NSInteger unitFlags = NSCalendarUnitMonth | NSCalendarUnitDay|NSCalendarUnitYear|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond|NSCalendarUnitWeekOfYear|NSCalendarUnitWeekday;
    NSDateComponents * component=[calendar components:unitFlags fromDate:date];
    
    NSInteger year=[component year];
    NSInteger month=[component month];
    NSInteger day=[component day];
    
    NSDate * today=[NSDate date];
    component=[calendar components:unitFlags fromDate:today];
    
    NSInteger t_year=[component year];
    NSString*string=nil;
    
    long long now = [today timeIntervalSince1970];
    long long  distance= now - timeNow;
    if(distance<60)
        [email protected]"刚刚";
    else if(distance<60*60)
        string=[NSString stringWithFormat:@"%lld分钟前",distance/60];
    else if(distance<60*60*24)
        string=[NSString stringWithFormat:@"%lld小时前",distance/60/60];
    else if(distance<60*60*24*7)
        string=[NSString stringWithFormat:@"%lld天前",distance/60/60/24];
    else if(year==t_year)
        string=[NSString stringWithFormat:@"%ld月%ld日",(long)month,(long)day];
    else
        string=[NSString stringWithFormat:@"%ld年%ld月%ld日",(long)year,(long)month,(long)day];
    
    return string;
}

+ (NSString *)detailTimeAgoStringByInterval:(long long)timeInterval
{
    return [SYKFDateUitil detailTimeAgoString:SYKFDateFromTimeInterval(timeInterval)];
}

+ (NSUInteger)daysAgoFromNow:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *components = [calendar components:(NSCalendarUnitDay)
                                               fromDate:date
                                                 toDate:[NSDate date]
                                                options:0];
    return [components day];
}

+ (NSUInteger)daysAgoAgainstMidnight:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSDateFormatter *mdf = [[self class] sharedDateFormatter];
    [mdf setDateFormat:@"yyyy-MM-dd"];
    NSDate *midnight = [mdf dateFromString:[mdf stringFromDate:date]];
    return (int)[midnight timeIntervalSinceNow] / (60*60*24) *-1;
}

+ (NSString *)stringDaysAgoAgainstMidnight:(BOOL)flag withDate:(NSDate *)date {
    
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    NSUInteger daysAgo = (flag) ? [SYKFDateUitil daysAgoAgainstMidnight:date] : [SYKFDateUitil daysAgoFromNow:date];
    NSString *text = nil;
    switch (daysAgo) {
        case 0:
            text = @"今天";
            break;
        case 1:
            text = @"昨天";
            break;
        default:
            text = [NSString stringWithFormat:@"%lu天前", daysAgo];
    }
    return text;
}

+ (NSString *)stringDaysAgo:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    return [SYKFDateUitil stringDaysAgoAgainstMidnight:YES withDate:date];
}

/*
 * iOS中规定的就是周日为1，周一为2，周二为3，周三为4，周四为5，周五为6，周六为7，
 * 无法通过某个设置改变这个事实的，只能在使用的时候注意一下这个规则了。
 */
+ (NSUInteger)weekDay:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSDateComponents *weekdayComponents = [[[self class] sharedCalendar] components:(NSCalendarUnitWeekday) fromDate:date];
    //我们的习惯是周一为第一天，那么我们改一下就OK了
    NSUInteger wDay = [weekdayComponents weekday];
    //将第一天设为周日
    if (wDay == 1) {
        wDay = 7;
    }else{
        wDay = wDay - 1;
    }
    return wDay;
}

+ (NSString *)weekDayString:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    NSDictionary *weekNameDict = @{
                                   @(1):@"一",
                                   @(2):@"二",
                                   @(3):@"三",
                                   @(4):@"四",
                                   @(5):@"五",
                                   @(6):@"六",
                                   @(7):@"日",
                                   };
    NSString *weekName = [weekNameDict objectForKey:@(SYKFDateGetWeekDay(date))];
    return [NSString stringWithFormat:@"星期%@",weekName];
}

+ (NSString *)weekNumberString:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    return [NSString stringWithFormat:@"第%lu周",SYKFDateGetWeekNum(date)];
}

+ (NSUInteger)weekNumber:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitWeekOfYear) fromDate:date];
    return [dateComponents weekOfYear];
}

+ (NSUInteger)hour:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitHour) fromDate:date];
    return [dateComponents hour];
}

+ (NSUInteger)minute:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitMinute) fromDate:date];
    return [dateComponents minute];
}

+ (NSUInteger)year:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitYear) fromDate:date];
    return [dateComponents year];
}

+ (NSUInteger)month:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitMonth) fromDate:date];
    return [dateComponents month];
}

+ (NSInteger)day:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return NSIntegerMax;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSCalendarUnitDay) fromDate:date];
    return [dateComponents day];
}

+ (NSDate *)dateFromTimeInterval:(long long)timeInterval
{
    return [NSDate dateWithTimeIntervalSince1970:timeInterval];
}

+ (NSDate *)dateFromString:(NSString *)string
{
    if (SYKFStringIsNull(string)) {  
        return nil;
    }
    return [SYKFDateUitil dateFromString:string withFormat:kNSDateHelperFormatSQLDate];
}

+ (NSDate *)dateTimeFromString:(NSString *)string
{
    if (SYKFStringIsNull(string)) {
        return nil;
    }
    return [SYKFDateUitil dateFromString:string withFormat:kNSDateHelperFormatSQLDateWithTime];
}

+ (NSDate *)dateFromString:(NSString *)string withFormat:(NSString *)format
{
    if (SYKFCheckKeyValueHasNull(string, format)) {
        return nil;
    }
    NSDateFormatter *formatter = [self sharedDateFormatter];
    [formatter setDateFormat:format];
    NSDate *date = [formatter dateFromString:string];
    return date;
}

+ (NSString *)stringFromDate:(NSDate *)date withFormat:(NSString *)string
{
    if (SYKFCheckKeyValueHasNull(string, date)) {
        return nil;
    }
    [[[self class] sharedDateFormatter] setDateFormat:string];
    NSString *timestamp_str = [[[self class] sharedDateFormatter] stringFromDate:date];
    return timestamp_str;
}

+ (NSString *)stringFromDate:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    return [SYKFDateUitil stringFromDate:date withFormat:kNSDateHelperFormatSQLDateWithTime];
}

+ (NSString *)stringWithDateStyle:(NSDateFormatterStyle)dateStyle timeStyle:(NSDateFormatterStyle)timeStyle withDate:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    [[[self class] sharedDateFormatter] setDateStyle:dateStyle];
    [[[self class] sharedDateFormatter] setTimeStyle:timeStyle];
    NSString *outputString = [[[self class] sharedDateFormatter] stringFromDate:date];
    return outputString;
}

+ (NSDate *)beginningOfWeek:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    // largely borrowed from "Date and Time Programming Guide for Cocoa"
    // we'll use the default calendar and hope for the best
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDate *beginningOfWeek = nil;
    BOOL ok = [calendar rangeOfUnit:NSCalendarUnitWeekOfYear startDate:&beginningOfWeek
                           interval:NULL forDate:date];
    if (ok) {
        return beginningOfWeek;
    }
    // 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:date];
    /*
     Create a date components to represent the number of days to subtract from the current date.
     The weekday value for Sunday in the Gregorian calendar is 1, so subtract 1 from the number of days to subtract from the date in question.  (If today's Sunday, subtract 0 days.)
     */
    NSDateComponents *componentsToSubtract = [[NSDateComponents alloc] init];
    [componentsToSubtract setDay: 0 - ([weekdayComponents weekday] - 1)];
    beginningOfWeek = nil;
    beginningOfWeek = [calendar dateByAddingComponents:componentsToSubtract toDate:date 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];
    
}

+ (NSDate *)beginningOfDay:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    // Get the weekday component of the current date
    NSDateComponents *components = [calendar components:(NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)
                                               fromDate:date];
    return [calendar dateFromComponents:components];
}

+ (NSDate *)endOfWeek:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    // Get the weekday component of the current date
    NSDateComponents *weekdayComponents = [calendar components:NSCalendarUnitWeekday fromDate:date];
    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:date options:0];
    
    return endOfWeek;
}

+ (NSString *)dateFormatString
{
    return kNSDateHelperFormatSQLDate;
}

+ (NSString *)timeFormatString
{
    return kNSDateHelperFormatSQLTime;
}

+ (NSString *)timestampFormatString
{
    return kNSDateHelperFormatSQLDateWithTime;
}

+ (NSString *)dbFormatString
{
    return kNSDateHelperFormatSQLDateWithTime;
}

+ (NSString *)birthdayToAge:(NSDate *)date
{
    if (SYKFCheckObjectNull(date)) {
        return nil;
    }
    NSCalendar *calendar = [[self class] sharedCalendar];
    NSDateComponents *components = [calendar components:(NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay)
                                               fromDate:date
                                                 toDate:[NSDate date]
                                                options:0];
    
    if ([components year] > 0) {
        
        return [NSString stringWithFormat:@"%ld岁",(long)[components year]];
        
    }else if([components month] > 0) {
        
        return [NSString stringWithFormat:@"%ld个月%ld天",(long)[components month],(long)[components day]];
        
    }else{
        
        return [NSString stringWithFormat:@"%ld天",(long)[components day]];
        
    }
}

+ (NSString *)birthdayToAgeByTimeInterval:(NSTimeInterval)date
{
    return [SYKFDateUitil birthdayToAge:SYKFDateFromTimeInterval(date)];
}

+ (NSString *)dateToConstellation:(NSDate *)date
{
    NSInteger day = [SYKFDateUitil day:date];
    NSInteger month = [SYKFDateUitil month:date];
    
    if (day == NSNotFound || month == NSNotFound) {
        return nil;
    }
    
    NSArray *constellations = @[
                                @"水瓶座", @"双鱼座", @"白羊座", @"金牛座", @"双子座", @"巨蟹座",
                                @"狮子座", @"处女座", @"天秤座", @"天蝎座", @"射手座", @"摩羯座"
                                ];
    
    NSString *constellation = nil;
    if( day <= 22 ){
        if( 1 != month ){
            constellation = constellations[month - 2];
        }else{
            constellation = constellations[11];
        }
    }else{
        constellation = constellations[month - 1];
    }
    return constellation;
}

+ (NSString *)dateToConstellationByTimeInterval:(NSTimeInterval)date
{
    return [SYKFDateUitil dateToConstellation:SYKFDateFromTimeInterval(date)];
}

+ (BOOL)isNullObject:(id)anObject
{
    if (!anObject || [anObject isKindOfClass:[NSNull class]]) {
        return YES;
    }else{
        return NO;
    }
}

+ (BOOL)checkValue:(id)value key:(id)key
{
    if(SYKFCheckObjectNull(value)||SYKFCheckObjectNull(key)){
        return YES;
    }else{
        return NO;
    }
}

+ (BOOL)boolIfIsToday:(NSString *)string
{
    NSDate * today=[NSDate date];
    NSString *todayString =[SYKFDateUitil stringFromDate:today withFormat:kNSDateHelperFormatSQLDate];
    if ([todayString isEqualToString:string]) {
        return YES;
    }else{
        return NO;
    }
}
           

需要用到时一句话搞定，方便吧……

需要源码请查看dema：https://github.com/Deng0512/NSDateFormat下载