In my app I have to compare two times: current (which is 12:44) and given I tried:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"hh:mm"];
NSDate *neededDate = [[NSDate alloc] init];
neededDate = [dateFormatter dateFromString:@"14:45"];
if ([neededDate compare:[NSDate date]] == NSOrderedAscending) {
NSLog(@"yes");
} else NSLog(@"no");
[neededDate release];
[dateFormatter release];
But any time I launch it, NSLog says "no". Please, suggest where I' m wrong. Thank you in advance.
Because your neededDate
will be equal to "1970/01/01 14:45"
.
You need to set correct year and date.
You can get current year, month and say, for example, using next approach:
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit fromDate:[NSDate date]];
NSLog(@"Current year: %d", components.year);
NSLog(@"Current month: %d", components.month);
NSLog(@"Current day: %d", components.day);
I think the problem is here:
[dateFormatter setDateFormat:@"hh:mm"];
should be:
[dateFormatter setDateFormat:@"HH:mm"];
because now for "14:45" it returns (null) date
(this is additionally to previous answer :)
it means that in your case, neededDate is always higher than the current date. this is probably because you store a 48 hour string in a 24 hour format. change the string to HH:mm
also, verify the value you store in neededDate.
here's a small example
NSDate *neededDate = [[NSDate date] dateByAddingTimeInterval:5];
if ([neededDate compare:[NSDate date]] == NSOrderedAscending) {
NSLog(@"asc");
} else {
NSLog(@"dec");
}
in this case, dec will be printed.
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