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
NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *tomorrowDate = [now dateByAddingTimeInterval:60*60*24*daysToAdd];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE, dd MMM yyyy"];
NSLog(@"%@", [dateFormatter stringFromDate:tomorrowDate]);
其他回答
基于highmaintenance的回答和vikingosegundo的评论,一个工作的Swift 3+实现。这个日期扩展也有额外的选项来改变年,月和时间:
extension Date {
/// Returns a Date with the specified amount of components added to the one it is called with
func add(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
let components = DateComponents(year: years, month: months, day: days, hour: hours, minute: minutes, second: seconds)
return Calendar.current.date(byAdding: components, to: self)
}
/// Returns a Date with the specified amount of components subtracted from the one it is called with
func subtract(years: Int = 0, months: Int = 0, days: Int = 0, hours: Int = 0, minutes: Int = 0, seconds: Int = 0) -> Date? {
return add(years: -years, months: -months, days: -days, hours: -hours, minutes: -minutes, seconds: -seconds)
}
}
如果按照OP的要求只增加一天,则用法如下:
let today = Date() // date is then today for this example
let tomorrow = today.add(days: 1)
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?
我也有同样的问题;使用NSDate扩展:
- (id)dateByAddingYears:(NSUInteger)years
months:(NSUInteger)months
days:(NSUInteger)days
hours:(NSUInteger)hours
minutes:(NSUInteger)minutes
seconds:(NSUInteger)seconds
{
NSDateComponents * delta = [[[NSDateComponents alloc] init] autorelease];
NSCalendar * gregorian = [[[NSCalendar alloc]
initWithCalendarIdentifier:NSCalendarIdentifierGregorian] autorelease];
[delta setYear:years];
[delta setMonth:months];
[delta setDay:days];
[delta setHour:hours];
[delta setMinute:minutes];
[delta setSecond:seconds];
return [gregorian dateByAddingComponents:delta toDate:self options:0];
}
使用下面的函数,并使用days参数来获取日期daysAhead/daysBehind,只需将参数传递为正,表示未来日期,为负,表示之前日期:
+ (NSDate *) getDate:(NSDate *)fromDate daysAhead:(NSUInteger)days
{
NSDateComponents *dateComponents = [[NSDateComponents alloc] init];
dateComponents.day = days;
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDate *previousDate = [calendar dateByAddingComponents:dateComponents
toDate:fromDate
options:0];
[dateComponents release];
return previousDate;
}
NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *tomorrowDate = [now dateByAddingTimeInterval:60*60*24*daysToAdd];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"EEEE, dd MMM yyyy"];
NSLog(@"%@", [dateFormatter stringFromDate:tomorrowDate]);