基本上,就像标题说的那样。我想知道如何添加1天的NSDate。
如果它是:
21st February 2011
它将变成:
22nd February 2011
或者如果它是:
31st December 2011
它将变成:
1st January 2012.
基本上,就像标题说的那样。我想知道如何添加1天的NSDate。
如果它是:
21st February 2011
它将变成:
22nd February 2011
或者如果它是:
31st December 2011
它将变成:
1st January 2012.
当前回答
在斯威夫特
var dayComponenet = NSDateComponents()
dayComponenet.day = 1
var theCalendar = NSCalendar.currentCalendar()
var nextDate = theCalendar.dateByAddingComponents(dayComponenet, toDate: NSDate(), options: nil)
其他回答
在Swift 4或Swift 5中,你可以使用like bellow:
let date = Date()
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: date)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
let yesterday_date = dateFormatter.string(from: yesterday!)
print("yesterday->",yesterday_date)
输出:
Current date: 2020-03-02
yesterday date: 2020-03-01
在swift中,您可以在NSDate中添加扩展方法
extension NSDate {
func addNoOfDays(noOfDays:Int) -> NSDate! {
let cal:NSCalendar = NSCalendar.currentCalendar()
cal.timeZone = NSTimeZone(abbreviation: "UTC")!
let comps:NSDateComponents = NSDateComponents()
comps.day = noOfDays
return cal.dateByAddingComponents(comps, toDate: self, options: nil)
}
}
你可以用这个
NSDate().addNoOfDays(3)
简单的Swift扩展昨天和明天从任何日期:
extension Date {
var previousDay: Date {
Calendar.current.date(byAdding: DateComponents(day:-1), to: self)!
}
var nextDay: Date {
Calendar.current.date(byAdding: DateComponents(day:+1), to: self)!
}
}
我在这里根据问题中的建议强制展开可选选项: 何时dateByAddingComponents:toDate:options返回nil?
NSDate *now = [NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *components = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:now];
NSDate *startDate = [calendar dateFromComponents:components];
NSLog(@"StartDate = %@", startDate);
components.day += 1;
NSDate *endDate = [calendar dateFromComponents:components];
NSLog(@"EndDate = %@", endDate);
Swift 4更新:
let now = Date() // the current date/time
let oneDayFromNow = Calendar.current.date(byAdding: .day, value: 1, to: now) // Tomorrow with same time of day as now