iOS NSCalendarDate

[newdev]

I need help with NSCalendarDate....

How do I convert the following functionality to iPhone app?

	NSCalendarDate *myDate = [[NSCalendarDate calendarDate]
								dateByAddingYears:0
								months:0
								days:0
								hours:-[[NSCalendarDate calendarDate] hourOfDay]
								minutes:-[[NSCalendarDate calendarDate] minuteOfHour]
								seconds:-[[NSCalendarDate calendarDate] secondOfMinute]];
	
	int hours = 12;
	int minutes = floor(hours * 60);
	
	return [myDate dateByAddingYears:0 months:0 days:0 hours:hours minutes:minutes seconds:0];

any ideas?

 

[grimjim]

Well, NSCalendarDate has been deprecated in favour of NSDate, so I suggest you look up the NSDate class reference in the documentation, and see how much of it has changed. You might also want to read 'Date and Time Programming Guide for Cocoa' which is also available on the documentation. I suspect that you won't need to change very much, just start using NSDate objects instead of NSCalendarDate.

 

[jguru]

I have been struggling with the same issue. I will let u know once I find a solution.. there isn't a 1-1 replacement of all the functionality of NSCalendarDate in NSDate ..

 

[admanimal]

You need a combination of NSDate, NSDateComponents, and NSCalendar. It's pretty easy once you figure them out.

 

[jguru]

You need a combination of NSDate, NSDateComponents, and NSCalendar. It's pretty easy once you figure them out.

do you have any small example that can show how to replace the above code? it will be of great help

thanks

 

[robbieduncan]

I'm trying to work out what the code is trying to do. What is the output date?

It seems to take the current date and time, delete the hours, minutes, seconds (so getting back to midnight?). Then it adds 12 hours and 12*60 minutes so gets to the start of tomorrow?

 

[robbieduncan]

Assuming my interpretation is correct:

NSDate *now = [[NSDate alloc] init];
NSCalendar *cal = [NSCalendar currentCalendar];
NSDateComponents *comps = [cal components:(NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:now];

[comps setHour:-[comps hour]];
[comps setMinute:-[comps minute]];
[comps setSecond:-[comps second]];

NSDate *startOfToday = [cal dateByAddingComponents:comps toDate:now options:0]; //This variable should now be pointing at a date object that is the start of today (midnight);

[comps setHour:24];
[comps setMinute:0];
[comps setSecond:0];

NSDate *startOfTomorrow = [cal dateByAddingComponents:comps toDate: startOfToday options:0];

Note this code is untested. I've not even compiled it: I just typed it straight into here. Assume there are typos and errors.

This all seems pretty simple and clear. Have you tried reading the documentation?

 

[jguru]

^ thanks.. i am not sure what newdev was trying to do but your example helps me a lot.. cheers