nsdate | 易学教程

NSDate to RFC 2822 Date format

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问题 Is there any efficient way to convert an NSDate to RFC 2822 Date format string ? I want to use this string to create an NSURLRequest and set the value of "If-Modified-Since" header field. 回答1: try to use an NSDateFormatter NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; // maybe there exist a new-method now dateFormatter.dateFormat = @"EEE, dd MMM yyyy HH:mm:ss Z"; //RFC2822-Format NSString *dateString = [dateFormatter stringFromDate:myDate]; 回答2: Swift 3 let rfcDateFormat =

iOS - how to compare two times?

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问题 I use the following function to check if a message has expired - - (BOOL) hasExpired:(NSDate*)myDate { if(myDate == nil) { return false; } NSDate *now = [NSDate date]; return !([now compare:myDate] == NSOrderedAscending); } This works fine if I am comparing two different dates. However, it returns false if the message has expired earlier in the day today. Any ideas on how I might fix it? 回答1: (Adding my comment as an answer:) This should not happen, also 1 second difference between NSDate

Converting a date by string format to nsdate result one day before string date

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问题 I searched about my problem but I did not find any help related... The story: The user create a continues event by name, start date, end date and note, so saves all fields on the Sqlite database. The both dates format are "yyyy-MM-dd". After that, when user want to do an action on event, the app checks the date that user selected by start and end date and if the entered date is before start date or after end date notifies user. The problem: I, as an user, created an event from 18-8-2012 to 18

NSDate as keys for NSDictionary

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问题 Is it possible to add NSDate as keys and some arrays as it values in a NSDictionary? I dont have any requirement of writing the dictionary to disk - archiving or unarchiving, just as this guy needs it: NSDictionary with NSDates as keys But, why I want NSDate to be added as keys specifically is so that I can fetch all keys from the dictionary and do some computations like, fetching the dates from within a range. Whether two objects with same date value share same memory when created? Is it

Weekday of first day of month

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问题 I need to get the weekday of the first day of the month. For example, for the current month September 2013 the first day falls on Sunday. 回答1: At first, get the first day of current month (for example): NSDate *today = [NSDate date]; NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *components = [gregorian components:(NSEraCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit) fromDate:today]; components.day = 1; NSDate

Notification in Swift every day at a set time? [duplicate]

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问题 This question already has an answer here : UILocalNotification always shows up as soon as I load my app regardless of the fire date (1 answer) Closed 4 years ago . If anyone gets confused and thinks that this is a duplicate of my question from yesterday, it's not. There I was asking how to call a function every day, here I am asking how to call a notification at a specific time every day. I am looking for a way to repeat a local notification every day at 7.00AM. I currently have this code

Whither NSDate dateByAddingTimeInterval on iPhone OS?

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问题 Greetings! I must be seeing things. Look at this excerpt from the iPhone OS reference library: addTimeInterval: Returns a new NSDate object that is set to a given number of seconds relative to the receiver. (Deprecated. This method has been replaced by dateByAddingTimeInterval: .) However, it is nowhere to be found in the docs, nor in the headers. If I look at the Mac OS SDK, then I find it. Typo? Just keep using addTimeInterval: after all?? 回答1: It's actually an error in the docs.

iOS - Not able to store NSDate into NSUserDefaults

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问题 In my application, i want to store the date at which the app is started for the first time. I'm using following code in application:didFinishLaunchingWithOptions method NSDate* today = [NSDate date]; [[NSUserDefaults standardUserDefaults] registerDefaults: @{@"CONSCIENCE_START_DATE" : today}]; NSLog(@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@"CONSCIENCE_START_DATE"]); But every time when i start the application, its printing the time at which the app is starting. Its not

change NSDate from one time zone to another [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Given a date in NSString like "2012-12-17 04:36:25" (which is GMT) how one can simply change it to other time zones like EST, CST All

NSDate hebrew date label

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I make label with the date for today but I need hebrew date for today. this my code NSDate *today = [NSDate date]; NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; [dateFormat setDateStyle:NSDateFormatterShortStyle]; NSString *dateString = [dateFormat stringFromDate:today]; [_label setText:dateString]; I not build calendar this label with date for today. Thanks! Assuming the user's current locale is not set for Hebrew, then you need to ensure the date formatter's locale is set for Hebrew, NSLocale *hebrew = [[NSLocale alloc] initWithLocaleIdentifier:@"he_IL"]; // Hebrew, Israel