nsdatecomponents

问题 I have this function : private func getCurrentDateComponent() -> NSDateComponents { let date = NSDate() let calendar = NSCalendar.currentCalendar() let components = calendar.components(.CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitMonth | .CalendarUnitYear | .CalendarUnitDay, fromDate: date) return components } When I call it and I use the function date var d = this.getCurrentDateComponent().date I don't know why the variable d is nil... Thank you for your help Ysee 回答1: That's how I

问题 I want to get the first day and the last day of the week. But my results do not match the documentation from apple: https://developer.apple.com/documentation/foundation/nsdatecomponents/1410442-weekday This is my function: func startAndEndDateOfWeek(weekOfYearWithYear: (week: Int,year: Int)) -> (start: Date, end: Date) { var output = (start: Date.init(), end: Date.init()) let calendar = Calendar(identifier: .gregorian) var firstDayComponents = DateComponents() firstDayComponents.weekOfYear =

问题 My problem is to do with the Time Profile of NSDateComponents operations given in the code snippet below. I have a method that iterates over a large array of NSDate objects Part of the method requires that I discard the Hour, Minute and seconds of each date. To do this I have 3 steps: I create an NSDateComponents object from my original date. I set the H:M:S elements to 0 I get my new date object that has H:M:S set to 0 as needed The Issue: Steps 1 & 3 above are taking a huge percentage of my

问题 Is there a better way to determine the NSDate for Memorial Day (the last Monday in May) in a given year? NSInteger aGivenYear = 2013 ; NSCalendar* calendar = [NSCalendar currentCalendar] ; NSDateComponents* firstMondayInJuneComponents = [NSDateComponents new] ; firstMondayInJuneComponents.month = 6 ; // Thanks, Martin R., for pointing out that `weekOfMonth` is wrong for returning the first Monday in June. firstMondayInJuneComponents.weekOfMonth = 1 ; firstMondayInJuneComponents.weekday = 2 ;

问题 I’m creating a date using NSDateComponents() . let startDate = NSDateComponents() startDate.year = 2015 startDate.month = 9 startDate.day = 1 let calendar = NSCalendar.currentCalendar() let startDateNSDate = calendar.dateFromComponents(startDate)! ... now I want to print all dates since the startDate until today, NSDate() . I’ve already tried playing with NSCalendarUnit , but it only outputs the whole difference, not the single dates between. let unit: NSCalendarUnit = [.Year, .Month, .Day,

问题 I’m creating a date using NSDateComponents() . let startDate = NSDateComponents() startDate.year = 2015 startDate.month = 9 startDate.day = 1 let calendar = NSCalendar.currentCalendar() let startDateNSDate = calendar.dateFromComponents(startDate)! ... now I want to print all dates since the startDate until today, NSDate() . I’ve already tried playing with NSCalendarUnit , but it only outputs the whole difference, not the single dates between. let unit: NSCalendarUnit = [.Year, .Month, .Day,

问题 Given an NSDate , how do I find the first day of that date's week, given the user's locale. For example, I've heard that some countries treat Monday as the first day of the week and others use Sunday. I need to return the preceding Monday in the first case but the preceding Sunday in the latter case. My best effort thus far always returns the preceding Sunday, regardless of the device settings applied: NSCalendar *calendar = [NSCalendar currentCalendar]; [calendar setLocale:[NSLocale

问题 I've been using dateByAddingComponents:toDate:options: and dateByAddingUnit:value:toDate:options: and using optional binding to get the date out of it. Like this: guard let startOfNextMonth = calendar.dateByAddingComponents(oneMonthComponent, toDate: startOfThisMonth, options: []) else { return nil } Where oneMonthComponent is just an NSDateComponent with the month value set to 1. When I read about it, in the documentation they both say something like: Returns nil if date falls outside the

问题 I create an instance of DateComponents using the following code: let dateComponents = DateComponents( calendar: .current, timeZone: Calendar.current.timeZone, era: nil, year: nil, month: nil, day: nil, hour: 9, minute: 0, second: 0, nanosecond: 0, weekday: 2, weekdayOrdinal: nil, quarter: nil, weekOfMonth: nil, weekOfYear: nil, yearForWeekOfYear: nil) I then print the dateComponents object and get the following (expected) output: calendar: gregorian (current) timeZone: Europe/London (current)

问题 I have two date string and I wanted to get the in between dates. For example, NSString *startDate = @"25-01-2014"; NSString *endDate = @"02-02-2014"; In between dates will be (26-01-2014, 27-01-2014, 28-01-2014.......) preferably include startDate and endDate as well. Most of the question I managed to find asked for number of days. But I needed it to be actual date. Is there anyway that I can get the in between dates? NSString *start = @"2010-09-01"; NSString *end = @"2010-12-05";