nsdate

问题 I am slowly getting into iOS development and trying to create a count up timer from a specific date. I have figured out the code which gives me the interval in seconds but I could not figure out how to extract Year/Month/Day/Hour/Minute/Second values from it in order to display each value in its own label as a ticker. So far I have figured out that the following will give me the interval between the 2 dates in seconds, what I am trying to do is to parse this and display on my view this as a

问题 I got current GMT time - 2013-05-15 08:55 AM my current local time is - 2013-05-15 02:06 PM and time zone is - Asia/Kolkata I tried to convert the above GMT to my local time with this code NSTimeZone* sourceTimeZone = [NSTimeZone timeZoneWithAbbreviation:@"Asia/Kolkata"]; [dateFormatter setTimeZone:sourceTimeZone]; // timeStamp - is the above GMT time NSDate *dateFromString = [dateFormatter dateFromString:timeStamp]; NSLog(@"local time is %@",dateFromString); but this give me wron time as -

问题 In my Core Data app I am using a FetchedResultsController. Usually to set titles for headers in a UITableView you would implement the following method like so: - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { id <NSFetchedResultsSectionInfo> sectionInfo = [[<#Fetched results controller#> sections] objectAtIndex:section]; return [sectionInfo name]; } where [sectionInfo name] returns a NSString. my sectionKeyPath is based on an NSDate and this all

问题 I wish to plot a line graph where the x-axis is defined as a number of days between two dates and the y-axis is a value that varies on each of the days. I can plot the y values as an NSNumber but I have no idea how to set the ranges and the markup on the x-axis. I have looked at the date example in the "examples" directory of the core-plot distribution but have found it a little confusing. Does anyone know of a tutorial, or code sample, which might asist me in this regard? Thank you in

问题 I am trying to force a user to select a date in the future with a date picker. I obviously used the compare: method, however, when I do the following code, even if it's the same date as [NSDate date], it tells the executes the if statement. Here is my code: if ([datePicker.date compare:[NSDate date]] == NSOrderedAscending) // If the picked date is earlier than today { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Hmm, this date is earlier than today" message:@"The date you've

问题 I'm try to get birth data for contacts but if user does not choose year or the contact come from Facebook and the year or the data it self is hidden so it give me the "1604" value for the year u can see what i mean in the image. 回答1: Congratulations, you've discovered an implementation detail! First off, Contacts stores dates as points in time, and it is impossible to store a point in time without a year, because every point in time has a year. Thus, a decision had to be made about how

问题 I am trying to take a date string and turn it into a specific NSDate (eg. July 1, 1981), but I don't see and methods for setting the date. Does anyone know how to accomplish this? Perhaps convert a DateTime object to NSDate? 回答1: The easiest way is to set it from DateTime. REVISION: The NSDate conversion operators are now explicit, not implicit anymore! I updated the example below. If you look at the NSDate prototype you will find two operators: public static explicit operator NSDate(DateTime

问题 I have a date that I need to split in some components. for example let components = NSCalendarUnit.CalendarUnitDay | NSCalendarUnit.CalendarUnitHour let date = calendar.components(components, fromDate: aDate, toDate: NSDate(), options: nil) var dateToPrint = "\(date.day) days \(date.hour) hours" dateToPrint will be the number of days and hours from aDate to now. But if i want the number of weeks instead of days let components = NSCalendarUnit.CalendarUnitWeek | NSCalendarUnit.CalendarUnitHour

问题 I have one query regarding NSDate. I have a date i.e. "2011-10-04 07:36:38 +0000", and I want to check if this date is yesterday, or today or a future date. How would I go about this? 回答1: Try this: Note: Change the date format as per your need. NSDateFormatter* df = [[NSDateFormatter alloc] init]; [df setDateFormat:@"MM/dd/yyyy"]; NSDate* enteredDate = [df dateFromString:@"10/04/2011"]; NSDate * today = [NSDate date]; NSComparisonResult result = [today compare:enteredDate]; switch (result) {

问题 I have the value of the epoch time like say 123456789, now I want to convert this into NSDate in cocoa framework. Can anyone show me? thanks 回答1: Documentation is your friend! NSDate* date = [NSDate dateWithTimeIntervalSince1970:123456789]; 回答2: Since this is a high hit, going to contribute. Note that just converting to NSDate will put it into the UTC timezone. Then you have to convert over to your timezone if you want to display it to the user, from Convert epoch time to NSDate with good