Compare Dates return time elapsed

[mediatagging]

I have a date stored in a NSString in the following format: 2011-02-20 14:04:25

I need a function that will:

Take the current time and subtract the given time from it.

If the result is less than seconds then display it as X seconds ago.
if the result is less than an hour display it as X minutes ago.
if the result is less than a day display it as X hours ago
all other results should be returned as X days ago.

P.S. I have it up on craigslist as i'm also willing to pay.
link: Objective C - Date function
thanks

[smasher]

I only ran a few tests, but this seems correct. It does not handle dates in the future.

-(NSDate*)dateFromString:(NSString*)dateString{
	// Convert string to date object
	NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
	[dateFormat setDateFormat:@"yyyy-MM-dd H:mm:ss"];
	NSDate *date = [dateFormat dateFromString:dateString];  
	[dateFormat release];
	
	return date;
}

#define kMinute 60
#define kHour (60*60)
#define kDay (60*60*24)
-(NSString*)textFromSeconds:(double)seconds{
	if(seconds < kMinute)
		return [NSString stringWithFormat:@"%0.0f seconds",seconds];
	
	if(seconds < kHour)
		return [NSString stringWithFormat:@"%0.0f minutes",seconds/kMinute];
	
	if(seconds < kDay)
		return [NSString stringWithFormat:@"%0.0f hours",seconds/kHour];
	
	return [NSString stringWithFormat:@"%0.0f days", seconds/kDay];
}

-(NSString*)textFromDateString:(NSString*)dateString{
	NSDate *date =[self dateFromString:dateString];
	double seconds = [[NSDate date] timeIntervalSinceDate:date];
	NSString *text = [self textFromSeconds:seconds];
	NSLog(@"text is: %@", text);
	return text;
}

-(void)test{
	[self textFromDateString:@"2011-02-20 17:19:25"];
	[self textFromDateString:@"2011-02-20 17:10:25"];
	[self textFromDateString:@"2011-02-20 14:04:25"];
	[self textFromDateString:@"2011-02-19 14:04:25"];
}

[mediatagging]

Originally Posted by smasher

I only ran a few tests, but this seems correct. It does not handle dates in the future.

-(NSDate*)dateFromString:(NSString*)dateString{
	// Convert string to date object
	NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
	[dateFormat setDateFormat:@"yyyy-MM-dd H:mm:ss"];
	NSDate *date = [dateFormat dateFromString:dateString];  
	[dateFormat release];
	
	return date;
}

#define kMinute 60
#define kHour (60*60)
#define kDay (60*60*24)
-(NSString*)textFromSeconds:(double)seconds{
	if(seconds < kMinute)
		return [NSString stringWithFormat:@"%0.0f seconds",seconds];
	
	if(seconds < kHour)
		return [NSString stringWithFormat:@"%0.0f minutes",seconds/kMinute];
	
	if(seconds < kDay)
		return [NSString stringWithFormat:@"%0.0f hours",seconds/kHour];
	
	return [NSString stringWithFormat:@"%0.0f days", seconds/kDay];
}

-(NSString*)textFromDateString:(NSString*)dateString{
	NSDate *date =[self dateFromString:dateString];
	double seconds = [[NSDate date] timeIntervalSinceDate:date];
	NSString *text = [self textFromSeconds:seconds];
	NSLog(@"text is: %@", text);
	return text;
}

-(void)test{
	[self textFromDateString:@"2011-02-20 17:19:25"];
	[self textFromDateString:@"2011-02-20 17:10:25"];
	[self textFromDateString:@"2011-02-20 14:04:25"];
	[self textFromDateString:@"2011-02-19 14:04:25"];
}

This is perfect, thank you.