How to check if 2 Dates have a difference of 30days? [duplicate] - objective-c

Question

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Closed 10 years ago.
Possible Duplicate:
How can I calculate the difference between two dates?
NSDate, comparing two dates
I have got two dates. How to check if theres a difference of 30 days in between them?
I actually have an In-App purchase which needs to be disabled after every 30-days of purchase.
When the user buys the feature, the Date is saved and so I need to check the dates. If 30-days have passed, I need to disable the feature again.

Answer 1

You can convert both dates to seconds with timeIntervalSince1970 and then check if difference is bigger than 2592000 (30*24*60*60 which is 30 days * 24 hours * 60 minutes * 60 seconds).
NSTimeInterval difference = [date1 timeIntervalSince1970] - [date2 timeIntervalSince1970];
if(difference >2592000)
{
//do your stuff here
}
EDIT:
For more compact version you can use - (NSTimeInterval)timeIntervalSinceDate:(NSDate *)anotherDate
NSTimeInterval difference = [date1 timeIntervalSinceDate:date2];
if(difference >2592000)
{
//do your stuff here
}

Answer 2

Provide the start and end NSDate in following manner:
NSDate *date_Start;
NSDate *date_End;
NSCalendar *cal=[NSCalendar currentCalendar];
NSDateComponents *components=[cal components:NSDayCalendarUnit fromDate:date_Start toDate:date_End options:0];
int days=[components day];
if(days>30){
//Your code here
}

Answer 3

You could create a date which is +30days from now :
NSDate *thrityDaysPlus = [[NSDate date] dateByAddingTimeInterval:3600*24*30]
and then simply compare it to your saved date
if ([date1 compare:date2] == NSOrderedDescending) {
NSLog(#"date1 is later than date2");
} else if ([date1 compare:date2] == NSOrderedAscending) {
NSLog(#"date1 is earlier than date2");
} else {
NSLog(#"dates are the same");
}