计算一个时间距离现在的时间差的方法

计算一个时间字符串距离现在的时间间隔

#pragma mark-一个时间距现在的时间

- (NSString *)intervalSinceNow: (NSString *) theDate

{

    NSArray * timeArray;

    if ([theDate rangeOfString:@"T"].location != NSNotFound)

    {

        timeArray=[theDate componentsSeparatedByString:@"T"];

        theDate=[NSString stringWithFormat:@"%@ %@",[timeArray objectAtIndex:0],[timeArray objectAtIndex:1]];

    }

    

    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 date];

    

    NSTimeInterval now=[dat timeIntervalSince1970]*1;

    

    NSTimeInterval cha=late-now;

    

    NSString *timeString=@"";

    NSString * dayStr = @"";

    NSString * hourStr = @"";

    NSString * minStr = @"";

    if (cha <=0)

    {

        timeString = @"已结束";

    }

    

    if (cha/3600/24 > 1)

    {

        dayStr = [NSString stringWithFormat:@"%d", (int)cha/3600/24];

        timeString=[NSString stringWithFormat:@"%@天", dayStr];

        cha = cha-3600*24*[dayStr intValue];

    }

    

    

    if (cha/3600 > 1) {

        hourStr = [NSString stringWithFormat:@"%d", (int)cha/3600];

        timeString=[NSString stringWithFormat:@"%@%@小时", timeString,hourStr];

        cha = cha-3600*[hourStr intValue];

    }

    

    if (cha/60 > 1) {

        minStr = [NSString stringWithFormat:@"%d", (int)cha/60];

        timeString=[NSString stringWithFormat:@"%@%@分", timeString,minStr];

        cha = cha-60*[minStr intValue];

    }

    

    if (cha > 1) {

        NSString * secondStr = [NSString stringWithFormat:@"%d", (int)cha];

        timeString=[NSString stringWithFormat:@"%@%@秒", timeString,secondStr];

    }

    

    return timeString;

}