nsdate

问题 Why does the following iOS 4.2 code return two different times? NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; [dateFormatter setTimeZone:gmt]; NSString* dateString = [dateFormatter stringFromDate:[NSDate date]]; NSLog(@"Date/Time is %@", dateString); NSDateFormatter *inputFormatter = [[[NSDateFormatter alloc] init] autorelease]; [inputFormatter

问题 I have two strings: date1 = 3-3-2011; and i want to convert in to 3-March-2011 and display it in label. NSString *myString = 3-3-2011; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter setDateFormat:@"d-MM-YYYY"]; NSDate *yourDate = [dateFormatter dateFromString:myString]; //now format this date to whatever you need… [dateFormatter setDateFormat:@"d-MMM-YYYY"]; NSString *resultString = [dateFormatter stringFromDate:yourDate]; [dateFormatter release]; but yourdate

问题 I am trying to get something similar to facebook post date/time. Like 1 min, 1 hour, Yesterday, Week ago etc. This is the is function I am using to get this format: ( Oct-22 17:28 PM ) func convertTime(serverTime: Double) -> String { let serverTime = serverTime let date = Date(timeIntervalSince1970: serverTime) let dateFomatter = DateFormatter() dateFomatter.dateFormat = "MMM-dd HH:mm a" let strDate = dateFomatter.string(from: date) print("This is the post's date: \(strDate)") return strDate

问题 I have created a calendar in my app, using the date object this way: NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *weekdayComponents = [gregorian components:(NSDayCalendarUnit | NSYearCalendarUnit | NSMonthCalendarUnit | NSMinuteCalendarUnit)fromDate:[NSDate date]]; NSInteger day = [weekdayComponents day]; NSInteger month = [weekdayComponents month]; NSInteger year = [weekdayComponents year]; m_dateFormatter.dateFormat = @"dd/MM

问题 How do I calculate the number of months between two dates using Cocoa? Thanks, Stan 回答1: Look at NSCalendars components:fromDate:toDate:options method. It allows you to subtract dates and then extract the months property value 回答2: NSInteger month = [[[NSCalendar currentCalendar] components: NSCalendarUnitMonth fromDate: yourFirstDate toDate: yourSecondDate options: 0] month]; 回答3: To get an answer that includes the fraction of a month the following can be used: - (NSNumber *

问题 NSDate conforms to NSCopying protocol. According to the documentation for NSCopying protocol: a copy must be a functionally independent object with values identical to the original at the time the copy was made. But, when I do this: NSDate *date1 = [NSDate date]; NSDate *date2 = [date1 copy]; NSLog(@"result: date1 0x%x date2 0x%x", (int)date1, (int)date2); // "result: date1 0x2facb0 date2 0x2facb0" The two objects are identical (same object id). What am I missing? How do I get an independent

问题 I'm using the JSON library from Stig Brautaset(http://code.google.com/p/json-framework) and I need to serialize an NSDate. I was considering converting it into a string before JSONifying it, however, I ran into this weird behavior: Why aren't these NSDates considered equal? NSDate *d = [[NSDate alloc] init]; NSDate *dd = [NSDate dateWithString:[d description]]; NSLog(@"%@", d); NSLog(@"%@", dd); if( [d isEqualToDate:dd] ){ NSLog(@"Yay!"); } 回答1: When you describe the original date object you

问题 How do I convert string 2010-11-19T20:00:00Z into an NSDate object? I've tried using [dateFormatter setDateFormat:@"yyyy-MM-ddTHH:mm:ssZ"] but it looks like I got the wrong custom format style. PS: I don't care about Timezones. Actually, I want the date to stay in the original (UTC) timezone. 回答1: Try using your format string to convert from an NSDate to a string and see what you get. It's easier debugging in that direction than the other. In this case, looks as though you need to escape the

问题 I am fetching a RSS, in which i receive the following Date stamp: 2010-05-10T06:11:14.000Z Now i am using NSDateFormatter to parse this datetime stamp. [parseFormatter setDateFormat:@"yyyy-MM-dTH:m:s.z"]; But its not working fine if just remove the time stamp part it works for the date [parseFormatter setDateFormat:@"yyyy-MM-d"]; But if i add the rest of the stuff it returns nil. Any idea ? Thanks in Advance.... 回答1: You need to parse zero padded values for d, H, m, s You need to escape the

问题 I'm seeking a way to get all American holidays as an array of NSDate s. Is there a way to implement that? 回答1: Here you'll find RSS-feeds with the holidays. It doesn't list year, but in the docs you'll find information how to change date ranges. Download it. I would suggest ASIHTTPRequest for that task. parse the RSS-feed. you can do so by normal XML-parsing, or you use a specialized parser. MWFeedParser would be one option. Save the dates. either by using CoreData, or Event Kit Framework 回答2