oc:transform:日期时间相关

DateStringTransform.m

//返回YYYY-MM-DD HH:MM:SS格式的当前时间
+(NSString *)getCurrentTime{
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
    return [dateFormatter stringFromDate:[NSDate date]];
}

//如果信息发表在1小时之前显示分钟，一天之内的信息显示小时，10天之内按天显示，10天之外按所发表时间进行显示：
+ (NSString *)intervalSinceNow: (NSString *) theDate 
{
    NSDateFormatter *date=[[NSDateFormatter alloc] init];
    [date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate *d=[date dateFromString:theDate];
    NSTimeInterval late=[d timeIntervalSince1970]*1;
    
    
    NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
    NSTimeInterval now=[dat timeIntervalSince1970]*1;
    NSString *timeString=@"";
    NSTimeInterval cha=now-late;
    
    if (cha/3600<1) {
        if (cha/60<1) {
            timeString = @"1";
        }
        else
        {
            timeString = [NSString stringWithFormat:@"%f", cha/60];
            timeString = [timeString substringToIndex:timeString.length-7];
        }
        
        timeString=[NSString stringWithFormat:@"%@分钟前", timeString];
    }
    else if (cha/3600>1&&cha/86400<1) {
        timeString = [NSString stringWithFormat:@"%f", cha/3600];
        timeString = [timeString substringToIndex:timeString.length-7];
        timeString=[NSString stringWithFormat:@"%@小时前", timeString];
    }
    else if (cha/86400>1&&cha/864000<1)
    {
        timeString = [NSString stringWithFormat:@"%f", cha/86400];
        timeString = [timeString substringToIndex:timeString.length-7];
        timeString=[NSString stringWithFormat:@"%@天前", timeString];
    }
    else
    {
//        timeString = [NSString stringWithFormat:@"%d-%"]
        NSArray *array = [theDate componentsSeparatedByString:@" "];
//        return [array objectAtIndex:0];
        timeString = [array objectAtIndex:0];
    }
    return timeString;
}