How to find difference, compare and get each field values in NSDate variables?

How can i do the following operations on NSDate variables?

1. How to compare two NSDate variables?

2. How to find difference between two NSDate variables?

3. How to get each separate value of minute, hours and days from NSDate variable?

We can get the current date by

NSDate *currentDate=[NSDate date]; 

But it will give the result of yyyy-mm-dd hh:mm:s开发者_如何学运维s GMT

From this, can i get hour field alone? or month value only?

---

From NSDate class reference, you have instance methods to do these -

1. How to compare two NSDate variables? Ans: isEqualToDate:
2. How to find difference between two NSDate variables? Ans: timeIntervalSinceDate:
3. How to get each separate value of minute, hours and days from NSDate variable? links

PS: Use Google to the maximum.