cocoa: how can i convert nsdate to nstimeinterval in cocoa?

Question

``` NSDate *newDate=[newDate dateByAddingTimeInterval:difference]; ``` Now I want to convert this newDate to NStimeInterval. How can I do this conversion?

Accepted Answer

`NDDate` and `NSTimeInterval` are two diferent things, you cannot convert a `NSDate` to a `NSTimeInterval` and vice-versa.

`NSDate` represents an absolute date and `NSTimeInterval` represents the time between two dates.

However you can create a NSTimeInterval from a reference date with this method:

```
- (NSTimeInterval)timeIntervalSinceDate:(NSDate *)anotherDate
```

You can do it like this:

```
NSDate *referenceDate = /* Your reference date */
NSDate *date = /* Your date */
NSTimeInterval timeInterval = [date timeIntervalSinceDate:referenceDate];
```

cocoa: how can i convert nsdate to nstimeinterval in cocoa?

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