CODEWITHSUNDEEP
objective-cdatecomparensdate
user1234
user1234

Reputation: 679

Objective-C: How to check if date occurred between two dates?

I searched this question before and found:

if (([dateToCompare compare:4HoursEarlier] == NSOrderedAscending) && ([dateToCompare compare:specifiedDate] == NSOrderedDescending))
{
    NSLog(@"dateToCompare between 4HoursEarlier and specifiedDate");
    // do something
}

Unfortunately, this seems not to work (the NSLog never gets printed).

I have a for loop that goes through an array (which contains dates). I need to check if the specified date is within 4 hours of another date. I have (pseudocode):

specifiedDate = a date I specify;
dateToCompare = current date gathered in for loop;
4HoursEarlier = 4 hours before specifiedDate;

How can I check if a specifiedDate is within 4 hours of dateToCompare (a date gathered from an array/for loop)?

Upvotes: 0

Views: 598

Answers (1)

Martin R
Martin R

Reputation: 540145

I think you got the comparisons the wrong way around. Exchange NSOrderedAscending and NSOrderedDescending in your condition.

My memory aid is

[obj1 compare:obj2] == NSOrderedAscending  : obj1, obj2 is an ascending sequence
[obj1 compare:obj2] == NSOrderedDescending : obj1, obj2 is an descending sequence

Therefore, to check if dateToCompare is later in time than fourHoursEarlier, you have to use

if ([dateToCompare compare:fourHoursEarlier] == NSOrderedDescending) ...

Upvotes: 1

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