ios – 获得firstdate,月份的最后日期

概述我想要获得第一个月,最后一个月,我试试 NSDateComponents *components = [calendar components:units fromDate:[NSDate date]];[components setDay:1];self.currentDate = [calendar dateFromComponents:components];int m = compo 我想要获得第一个月,最后一个月,我试试

NSDateComponents *components = [calendar components:units fromDate:[NSDate date]];[components setDay:1];self.currentDate = [calendar dateFromComponents:components];int m = components.month;int y = components.year;int d = components.day;log: 2012,5,1

我怎么可以得到lastdate od个月？

请给我一些建议,谢谢！

解决方法 我写的一些NSDate类别方法可以帮助你：

这是一个简单的方法来找到一个月的开始：

(NSDate *) startOfMonth{    NSCalendar * calendar = [NSCalendar currentCalendar];    NSDateComponents * currentDateComponents = [calendar components: NSYearCalendarUnit | NSMonthCalendarUnit fromDate: self];    NSDate * startOfMonth = [calendar dateFromComponents: currentDateComponents];    return startOfMonth;}

所有这一切都是从当天开始的年份和月份组件,然后再次转换为日期.

在本月底,我使用了几种方法：

- (NSDate *) dateByAddingMonths: (NSInteger) monthsToAdd{    NSCalendar * calendar = [NSCalendar currentCalendar];    NSDateComponents * months = [[NSDateComponents alloc] init];    [months setMonth: monthsToAdd];    return [calendar dateByAddingComponents: months toDate: self options: 0];}

和

- (NSDate *) endOfMonth{    NSCalendar * calendar = [NSCalendar currentCalendar];    NSDate * plusOneMonthDate = [self dateByAddingMonths: 1];    NSDateComponents * plusOneMonthDateComponents = [calendar components: NSYearCalendarUnit | NSMonthCalendarUnit fromDate: plusOneMonthDate];    NSDate * endOfMonth = [[calendar dateFromComponents: plusOneMonthDateComponents] dateByAddingTimeInterval: -1]; // One second before the start of next month    return endOfMonth;}

这是一个3步的过程 – 在当前日期添加一个月,找到下个月的开始,然后减去1秒,以找到本月底.

Swift 3

extension Date {    func startOfMonth() -> Date? {        let calendar = Calendar.current        let currentDateComponents = calendar.dateComponents([.year,.month],from: self)        let startOfMonth = calendar.date(from: currentDateComponents)        return startOfMonth    }    func dateByAddingMonths(_ monthsToAdd: Int) -> Date? {        let calendar = Calendar.current        var months = DateComponents()        months.month = monthsToAdd        return calendar.date(byAdding: months,to: self)    }    func endOfMonth() -> Date? {        guard let plusOneMonthDate = dateByAddingMonths(1) else { return nil }        let calendar = Calendar.current        let plusOneMonthDateComponents = calendar.dateComponents([.year,from: plusOneMonthDate)        let endOfMonth = calendar.date(from: plusOneMonthDateComponents)?.addingTimeInterval(-1)        return endOfMonth    }}

斯威夫特2

extension NSDate {    func startOfMonth() -> NSDate? {        let calendar = NSCalendar.currentCalendar()        let currentDateComponents = calendar.components(.CalendarUnitYear | .CalendarUnitMonth,fromDate: self)        let startOfMonth = calendar.dateFromComponents(currentDateComponents)        return startOfMonth    }    func dateByAddingMonths(monthsToAdd: Int) -> NSDate? {        let calendar = NSCalendar.currentCalendar()        let months = NSDateComponents()        months.month = monthsToAdd        return calendar.dateByAddingComponents(months,toDate: self,options: nil)    }    func endOfMonth() -> NSDate? {        let calendar = NSCalendar.currentCalendar()        if let plusOneMonthDate = dateByAddingMonths(1) {            let plusOneMonthDateComponents = calendar.components(.CalendarUnitYear | .CalendarUnitMonth,fromDate: plusOneMonthDate)            let endOfMonth = calendar.dateFromComponents(plusOneMonthDateComponents)?.dateByAddingTimeInterval(-1)            return endOfMonth        }        return nil    }}

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