如何比较目标c中的日期

Question

I want compare two dates one would be the current date and other date stored in database. So I want to find out which date is grater from both.

Answer 1

You can use the compare method of the NSDate class

[myDate compare:someOtherDate]

This will return one of three values of type NSComparisonResult...

• NSOrderedSame if both dates are equal
• NSOrderedDescending if myDate comes after someOtherDate
• NSOrderedAscending if myDate comes before someOtherDate

Answer 2

Check apple documentation .

You can use the following methods,

• – isEqualToDate:
• – earlierDate:
• – laterDate:
• – compare:

Answer 3

You can use compare: method to find which date is earlier or later check the documentation on this

http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSDate_Class/

Edit:

NSDateFormatter * formatter= [NSDateFormatter alloc] init];
NSDate *date = [formatter dateFromString:stringDate];
[formatter release];

then compare them.