nsdate

问题 My date string that I am getting is 2014-01-08T21:21:22.737+05:30 of this format. How do i confer it to NSDate? I tried: NSString *currentDateString = @"2014-01-08T21:21:22.737+05:30"; [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS+05:30"]; NSDate *currentDate = [dateFormatter dateFromString:currentDateString]; NSLog(@"CurrentDate:%@", currentDate); It returns nil. Any thoughts? 回答1: Use this code it is working fine your dateFormatter was wrong . NSDateFormatter *dateFormatter=[

问题 In my app I store the date as a string("MM/dd/YYYY" format). In the DB. later when I retrieve the string I have to compare two dates, how do I achieve this? If I had used the"YYYY/MM/dd" format I could have directly compared it as strings. Now I have to convert back into NSDate object using "nsdateformatter" and "dateFromString". But I get a constant date value using this no matter what I do. Any ideas?? 回答1: NSDateFormatter* df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"MM/dd/yyyy

问题 I've got an array of NSDates and I'd like to grab the largest NSDate from the array. While i could always sort them and grab the first/last, is there a way to do this with KeyValueCoding or some other quick one liner kind of way? I know that I could use something like valueForKeyPath@"@max.date" if the objects had a date property, but what if the objects are dates themselves?? thanks 回答1: You can use, NSDate *maxDate = [dateArray valueForKeyPath:@"@max.self"]; This will give you the largest

问题 This question already has answers here : How can I compare two dates, return a number of days (4 answers) Objective C - calculating the number of days between two dates (6 answers) Closed 6 years ago . I'm trying to make a label that says how many days left till event. I want to calculate the difference between todays date and the events date. I'm using this code and its giving me -4600. It works fine till I use todays date. NSDateFormatter *f = [[NSDateFormatter alloc] init]; [f

问题 I'm trying to use the NSDate dateFromString method but I'm getting an warning and it's crashing the app. The code looks like: NSString *pickerDate = [NSString stringWithFormat:@"%@", timeSelector.date]; NSDate *defaultDate = [NSDate dateFromString:pickerDate]; The warning is: 'NSDate' may not respond to '+dateFromString'. It appears that method is deprecated (in the midst of an upgrade from XCode 2 to 3. What alternate method can I use to create a date from a string? 回答1: NSDateFormatter is

问题 I have an NSArray of NSDate objects and I want to sort them so that today is at 0, yesterday at 1 etc. Is it ascending or descending, and do i use a function, selector or what? 回答1: There are different sort methods for NSArray because there may be different ways you want to sort things. NSSortDescriptors are a general way that give you a lot of options as far as what keys to use in sorting, what selectors you want to use on those keys, and overall order to use, etc. Or you can use functions

问题 Suppose I have a simple String, extracted from an array of strings (representing dates) - var myDateString = "2015-11-25 04:31:32.0" Now, I want to convert it to a string that looks like Nov 25, 2015 . For that, I assume I need to - get a NSDate date object from string using NSDateFormatter get a string from that NSDate object by using some functionality (which I've been unable to find) I've been trying this in Playground, but have been unable to solve such a simple problem. Here is what I

问题 I want to set the NSDate time with my desired hours:minutes:seconds currently im working with NSDate component but it is not giving the desired result [comps setHour: -hours]; [comps setMinute:0]; [comps setSecond:0]; NSDate *minDate = [calendar_c dateFromComponents:comps]; 回答1: Your approach should work fine. I needed a solution for this type problem (setting the individual date components) and the following code works as expected for me. My situation: I wanted to create a date object that

问题 With the iOS SDK I need to find an easy and secure way to see if an NSDate is today, yesterday, tomorrow. What I'm looking for is something like this in pseudo code: NSDate *myDate = someDate; if ([myDate isTomorrow]) { NSLog("Tomorrow"); } How would you solve it? 回答1: Check our Erica Sadun's great NSDate extension class: http://github.com/erica/NSDate-Extensions There are lots of date comparisons, among them exactly what you need :) 回答2: I understand that this is pretty old, but I want to

问题 If I create a Date() to get the current date and time, I want to create a new date from that but with different hour, minute, and zero seconds, what's the easiest way to do it using Swift? I've been finding so many examples with 'getting' but not 'setting'. 回答1: Be aware that for locales that uses Daylight Saving Times, some hours may not exist on the clock change days or they may occur twice. Both solutions below return a Date? and use force-unwrapping. You should handle possible nil in your