How can I add just the day of a UIDatePicker to a label - e.g. just "28" when the date selected is "28/10/2011" [duplicate]

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U开发者_开发知识库IDatePicker and NSDate

Can I do this and how? I simply need to get the day inputted by the user and put it into a label, rather than the whole date (e.g. old: 28/10/2011 new: 28)

Thanks

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If your user input is text you will need to start with an NSDateFormatter and then you can extract the day from the calendar components. (I recommend collecting the date through a UIDatePicker)

//Start here for a date that is a string
NSString *userinput = @"28/10/2011";

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd/MM/yyyy"];
NSDate *date = [formatter dateFromString:userinput];
[formatter release];

//Start here if you already have an `NSDate` object
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit 
                                                               fromDate:date];

NSString *dayForLabel = [NSString stringWithFormat:@"%d", [components day]];

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Something like this:

NSDate *date = [picker date];

NSCalendar *calendar = [picker calendar];

NSDateComponents *dateComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:date];

NSInteger day = [dateComponents day];

label.text = [NSString stringWithFormat:@"%d", day];