ios时间相关的工具NSDate

/获取年月日对象+(NSDateComponents *)getDateComponents:(NSDate *)date {    NSCalendar *calendar = [NSCalendar currentCalendar];//    [calendar setFirstWeekday:2]; //设置每周的开始是星期一//    [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天    return [calendar components:            NSYearCalendarUnit|            NSMonthCalendarUnit|            NSDayCalendarUnit|            NSWeekOfYearCalendarUnit|            NSQuarterCalendarUnit fromDate:date];}//获得某年的周数+(NSInteger)getWeek_AccordingToYear:(NSInteger)year {        NSDateComponents *comps = [DataTimeTool getDateComponents:[DataTimeTool dateFromString:[NSString stringWithFormat:@"%ld-12-31",year] DateFormat:@"yyyy-MM-dd"]];    NSInteger week = [comps weekOfYear];    if (week == 1) {        return 52;    }else {        return week;    }}/** *  获取某年某周的范围日期 * *  @param year       年份 *  @param weekofYear year里某个周 * *  @return 时间范围字符串 */+(NSString*)getWeekRangeDate_Year:(NSInteger)year WeakOfYear:(NSInteger)weekofYear{    NSString *weekDate = @"";    NSString *timeAxis = [NSString stringWithFormat:@"%ld-06-01 12:00:00",(long)year];    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];    NSDate *date = [dateFormatter dateFromString:timeAxis];        NSCalendar *calendar = [NSCalendar currentCalendar];    /**这两个参数的设置影响着周次的个数和划分*****************/    [calendar setFirstWeekday:2]; //设置每周的开始是星期一//    [calendar setMinimumDaysInFirstWeek:7]; //设置一周至少需要几天    NSDateComponents *comps = [calendar components:(NSCalendarUnitWeekOfYear | NSCalendarUnitWeekday | NSCalendarUnitWeekdayOrdinal | NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay)                                          fromDate:date];    //时间轴是当前年的第几周    NSInteger todayIsWeek = [comps weekOfYear];    if ([DataTimeTool getWeek_AccordingToYear:year] == 53) {        todayIsWeek += 1;    }    //获取时间轴是星期几 1(星期天) 2(星期一) 3(星期二) 4(星期三) 5(星期四) 6(星期五) 7(星期六)    NSInteger todayIsWeekDay = [comps weekday];    // 计算当前日期和这周的星期一和星期天差的天数    //firstDiff 星期一相差天数 、 lastDiff 星期天相差天数    long firstDiff,lastDiff;    if (todayIsWeekDay == 1) {        firstDiff = -6;        lastDiff = 0;    }else    {        firstDiff = [calendar firstWeekday] - todayIsWeekDay;        lastDiff = 8 - todayIsWeekDay;    }        NSDate *firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*firstDiff sinceDate:date];    NSDate *lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*lastDiff sinceDate:date];        long weekdifference = weekofYear - todayIsWeek;        firstDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:firstDayOfWeek];    lastDayOfWeek= [NSDate dateWithTimeInterval:24*60*60*7*weekdifference sinceDate:lastDayOfWeek];        weekDate = [NSString stringWithFormat:@"第%ld周(%@-%@)",weekofYear,[DataTimeTool stringFromDate:firstDayOfWeek DateFormat:@"yyyy年M月d号"],[DataTimeTool stringFromDate:lastDayOfWeek DateFormat:@"yyyy年M月d号"]];        return weekDate;}/**************************当前时间********************************/+(NSDateComponents *)getCurrentDateComponents {    return [DataTimeTool getDateComponents:[NSDate date]];}+(NSInteger)getCurrentWeek {    NSInteger week = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"w"] intValue];    return week;}+(NSInteger)getCurrentYear{    NSInteger year = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"y"] intValue];    return year;}+(NSInteger)getCurrentQuarter{    NSInteger quarter = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"q"] intValue];    return quarter;}+(NSInteger)getCurrentMonth{    NSInteger month = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"M"] intValue];    return month;}+(NSInteger)getCurrentDay{    NSInteger day = [[DataTimeTool stringFromDate:[NSDate date] DateFormat:@"d"] intValue];    return day;}//NSString转NSDate+(NSDate *)dateFromString:(NSString *)dateString DateFormat:(NSString *)DateFormat{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:DateFormat];    NSDate *destDate= [dateFormatter dateFromString:dateString];    return destDate;}//NSDate转NSString+(NSString *)stringFromDate:(NSDate *)date DateFormat:(NSString *)DateFormat{    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];    [dateFormatter setDateFormat:DateFormat];    NSString *destDateString = [dateFormatter stringFromDate:date];    return destDateString;}//时间追加+(NSString *)dateByAddingTimeInterval:(NSTimeInterval)TimeInterval DataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat{    NSString *str = nil;    NSDate *date = [self dateFromString:dateStr DateFormat:DateFormat];    NSDate * newDate = [date dateByAddingTimeInterval:TimeInterval];    str = [self stringFromDate:newDate DateFormat:DateFormat];    return str;}//日期字符串格式化+(NSString *)getDataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat {   return [self getDataTime:dateStr DateFormat:DateFormat oldDateFormat:nil];}+(NSString *)getDataTime:(NSString *)dateStr DateFormat:(NSString *)DateFormat oldDateFormat:(NSString *)oldDateFormat{        if (!dateStr || [dateStr isEqualToString:@"—"]) {        return @"—";    }        if ([dateStr isEqualToString:@"0"]) {        return @"0";    }        if ([dateStr rangeOfString:@"+"].location != NSNotFound) {        NSArray *strarray = [dateStr componentsSeparatedByString:@"+"];        dateStr = strarray[0];    }        if ([dateStr rangeOfString:@"."].location != NSNotFound) {        NSArray *strarray = [dateStr componentsSeparatedByString:@"."];        dateStr = strarray[0];    }        if ([dateStr rangeOfString:@"T"].location != NSNotFound) {        dateStr = [dateStr stringByReplacingOccurrencesOfString:@"T" withString:@" "];    }        NSDateFormatter *newDateFormatter = [[NSDateFormatter alloc]init];    [newDateFormatter setDateFormat:DateFormat];        NSDateFormatter *oldDateFormatter = [[NSDateFormatter alloc] init];        if (oldDateFormat) {        [oldDateFormatter setDateFormat:oldDateFormat];    }else {        [oldDateFormatter setDateFormat:[self getFormat:dateStr]];    }        NSDate *date = [oldDateFormatter dateFromString:dateStr];        return [newDateFormatter stringFromDate:date];}+(int)getNumberOfCharactersInString:(NSString *)str c:(char)c {    int count = 0;    if ([str rangeOfString:[NSString stringWithFormat:@"%c",c]].location != NSNotFound){        for (int i=0;i<str.length;i++){            if ([str characterAtIndex:i] == c){                count++;            }        }    }    return count;}+(NSString *)getFormat:(NSString *)dateString {    NSString *str = [NSString new];    int size = [self getNumberOfCharactersInString:dateString c:'-'];    if (size == 0){        str = [str stringByAppendingString:@"yyyy"];    }else if (size == 1){        str = [str stringByAppendingString:@"yyyy-MM"];    }else if (size == 2){        str = [str stringByAppendingString:@"yyyy-MM-dd"];    }    size = [self getNumberOfCharactersInString:dateString c:':'];    if (size == 0 && [dateString rangeOfString:@" "].location != NSNotFound){        str = [str stringByAppendingString:@" HH"];    }else if (size == 1){        str = [str stringByAppendingString:@" HH:mm"];    }else if (size == 2){        str = [str stringByAppendingString:@" HH:mm:ss"];    }    return str;}/** *  json日期转iOS时间 * *  @param string /Date() * *  @return */+(NSString *)interceptTimeStampFromStr:(NSString *)string DateFormat:(NSString *)DateFormat{    if (!string || [string length] == 0 ) // 传入时间戳为空 返回    {        return @"—";    }    NSMutableString * mutableStr = [NSMutableString stringWithString:string];    NSString * timeStampString = [NSString string];    //  遍历取出括号内的时间戳    for (int i = 0; i < string.length; i ++) {        NSRange startRang = [mutableStr rangeOfString:@"("];        NSRange endRang = [mutableStr rangeOfString:@")"];        if (startRang.location != NSNotFound) {            // 左边括号位置            NSInteger leftLocation = startRang.location;            // 右边括号距离左边括号的长度            NSInteger rightLocation = endRang.location - startRang.location;            // 截取括号时间戳内容            timeStampString = [mutableStr substringWithRange:NSMakeRange(leftLocation + 1,rightLocation - 1)];        }    }        // 把时间戳转化成时间    NSTimeInterval interval=[timeStampString doubleValue] / 1000.0;    NSDate *date = [NSDate dateWithTimeIntervalSince1970:interval];    NSDateFormatter *objDateformat = [[NSDateFormatter alloc] init];    [objDateformat setDateFormat:DateFormat];//年月日时分秒    NSString * timeStr = [NSString stringWithFormat:@"%@",[objDateformat stringFromDate: date]];    return timeStr;}