日期分类

- (NSDateComponents *)componentsOfDay {

    return [[NSCalendarcurrentCalendar]components:NSCalendarUnitYear |NSCalendarUnitMonth|NSCalendarUnitDay|NSCalendarUnitWeekday|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecondfromDate: self];

}

- (BOOL)isEqualToDateIgnorTime:(NSDate *)date

{

    NSDateComponents *components = [selfcomponentsOfDay];

    NSDateComponents *componentd = [datecomponentsOfDay];

    return (componentd.year == components.year && components.month == componentd.month && components.day == componentd.day);

}

- (NSString *)stringWithExcludeThisYear {

    BOOL isThisYear =NO;

    NSDate *nowDate = [NSDatedate];

    if ([nowDatecomponentsOfDay].year != [selfcomponentsOfDay].year) {

        isThisYear =NO;

    }else{

        isThisYear =YES;

    }

    NSDateFormatter *formatter = [[NSDateFormatteralloc]init];

    if (isThisYear) {

        [formatter setDateFormat:@"MM月dd日"];

    }else{

        [formatter setDateFormat:@"yyyy年MM月dd日"];

    }

    return [formatterstringFromDate:self];

}

//判断是否是今天

- (BOOL)isToday {

    NSDate *date = [NSDatedate];

    

    return [selfisEqualToDateIgnorTime:date];

}

//判断是否是昨天

- (BOOL)isYesterDay {

    NSTimeInterval time = [[NSDatedate]timeIntervalSince1970]-24*60*60;

    NSDate *yesterDayDate = [NSDatedateWithTimeIntervalSince1970:time];

    return [selfisEqualToDateIgnorTime:yesterDayDate];

}

+(NSString *)stringWithTimeInterval:(NSTimeInterval)time {

    NSDate *date = [NSDatedateWithTimeIntervalSince1970:time];

    NSInteger hour = [datecomponentsOfDay].hour;

    NSInteger minute = [datecomponentsOfDay].minute;

    NSTimeInterval nowTime = [[NSDatedate]timeIntervalSince1970];

    

    if (nowTime - time>=7*24*60*60) {

        NSDateFormatter *formatter = [[NSDateFormatteralloc]init];

        [formatter setDateFormat:@"yyyy年MM月dd日 HH:mm"];

        return [formatterstringFromDate:date];

    }else{

        if ([dateisToday]) {

            return [NSStringstringWithFormat:@"今天 %ld:%ld",hour,minute];

        }elseif ([date isYesterDay]){

            return [NSStringstringWithFormat:@"昨天 %ld:%ld",hour,minute];

        }else{

            NSArray *weekInfo =@[@"星期日",@"星期一",@"星期二",@"星期三",@"星期四",@"星期五",@"星期六"];

            NSInteger weekDay = [datecomponentsOfDay].weekday;

            NSString *weekString = weekInfo[weekDay -1];

            return [NSStringstringWithFormat:@"%@ %ld:%ld",weekString, hour,minute];

        }

    }

}