问题
Basically, as the title says. I\'m wondering how I could add 1 day to an NSDate.
So if it were:
21st February 2011
It would become:
22nd February 2011
Or if it were:
31st December 2011
It would become:
1st January 2012.
回答1:
NSDateComponents *dayComponent = [[NSDateComponents alloc] init];
dayComponent.day = 1;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
NSDate *nextDate = [theCalendar dateByAddingComponents:dayComponent toDate:[NSDate date] options:0];
NSLog(@"nextDate: %@ ...", nextDate);
This should be self-explanatory.
回答2:
Since iOS 8 you can use NSCalendar.dateByAddingUnit
Example in Swift 1.x:
let today = NSDate()
let tomorrow = NSCalendar.currentCalendar()
.dateByAddingUnit(
.CalendarUnitDay,
value: 1,
toDate: today,
options: NSCalendarOptions(0)
)
Swift 2.0:
let today = NSDate()
let tomorrow = NSCalendar.currentCalendar()
.dateByAddingUnit(
.Day,
value: 1,
toDate: today,
options: []
)
Swift 3.0:
let today = Date()
let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: today)
回答3:
Objective C
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
// now build a NSDate object for the next day
NSDateComponents *offsetComponents = [[NSDateComponents alloc] init];
[offsetComponents setDay:1];
NSDate *nextDate = [gregorian dateByAddingComponents:offsetComponents toDate: [NSDate date] options:0];
Updated for Swift 5
let today = Date()
let nextDate = Calendar.current.date(byAdding: .day, value: 1, to: today)
回答4:
iOS 8+, OSX 10.9+, Objective-C
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *tomorrow = [cal dateByAddingUnit:NSCalendarUnitDay
value:1
toDate:[NSDate date]
options:0];
回答5:
A working Swift 3+ implementation based on highmaintenance's answer and vikingosegundo's comment. This Date extension also has additional options to change year, month and time:
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)
}
}
Usage for only adding a day as asked by OP would then be:
let today = Date() // date is then today for this example
let tomorrow = today.add(days: 1)
回答6:
Swift 4.0 (same as Swift 3.0 in this wonderful answer just making it clear for rookies like me)
let today = Date()
let yesterday = Calendar.current.date(byAdding: .day, value: -1, to: today)
回答7:
Use the below function and use days paramater to get the date daysAhead/daysBehind just pass parameter as positive for future date or negative for previous dates:
+ (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;
}
回答8:
In swift
var dayComponenet = NSDateComponents()
dayComponenet.day = 1
var theCalendar = NSCalendar.currentCalendar()
var nextDate = theCalendar.dateByAddingComponents(dayComponenet, toDate: NSDate(), options: nil)
回答9:
Swift 3.0 very simple implementation would be:
func dateByAddingDays(inDays: Int) -> Date {
let today = Date()
return Calendar.current.date(byAdding: .day, value: inDays, to: today)!
}
回答10:
It's work!
NSCalendar *calendar = [NSCalendar currentCalendar];
NSCalendarUnit unit = NSCalendarUnitDay;
NSInteger value = 1;
NSDate *today = [NSDate date];
NSDate *tomorrow = [calendar dateByAddingUnit:unit value:value toDate:today options:NSCalendarMatchStrictly];
回答11:
NSDate *today=[NSDate date];
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
NSDateComponents *components=[[NSDateComponents alloc] init];
components.day=1;
NSDate *targetDate =[calendar dateByAddingComponents:components toDate:today options: 0];
回答12:
Swift 4.0
extension Date {
func add(_ unit: Calendar.Component, value: Int) -> Date? {
return Calendar.current.date(byAdding: unit, value: value, to: self)
}
}
Usage
date.add(.day, 3)! // adds 3 days
date.add(.day, -14)! // subtracts 14 days
Note: If you don't know why the lines of code end with an exclamation point, look up "Swift Optionals" on Google.
回答13:
You can use NSDate's method - (id)dateByAddingTimeInterval:(NSTimeInterval)seconds where seconds would be 60 * 60 * 24 = 86400
回答14:
In Swift 2.1.1 and xcode 7.1 OSX 10.10.5 ,you can add any number of days forward and backwards using function
func addDaystoGivenDate(baseDate:NSDate,NumberOfDaysToAdd:Int)->NSDate
{
let dateComponents = NSDateComponents()
let CurrentCalendar = NSCalendar.currentCalendar()
let CalendarOption = NSCalendarOptions()
dateComponents.day = NumberOfDaysToAdd
let newDate = CurrentCalendar.dateByAddingComponents(dateComponents, toDate: baseDate, options: CalendarOption)
return newDate!
}
function call for incrementing current date by 9 days
var newDate = addDaystoGivenDate(NSDate(), NumberOfDaysToAdd: 9)
print(newDate)
function call for decrement current date by 80 days
newDate = addDaystoGivenDate(NSDate(), NumberOfDaysToAdd: -80)
print(newDate)
回答15:
Here is a general purpose method which lets you add/subtract any type of unit(Year/Month/Day/Hour/Second etc) in the specified date.
Using Swift 2.2
func addUnitToDate(unitType: NSCalendarUnit, number: Int, date:NSDate) -> NSDate {
return NSCalendar.currentCalendar().dateByAddingUnit(
unitType,
value: number,
toDate: date,
options: NSCalendarOptions(rawValue: 0))!
}
print( addUnitToDate(.Day, number: 1, date: NSDate()) ) // Adds 1 Day To Current Date
print( addUnitToDate(.Hour, number: 1, date: NSDate()) ) // Adds 1 Hour To Current Date
print( addUnitToDate(.Minute, number: 1, date: NSDate()) ) // Adds 1 Minute To Current Date
// NOTE: You can use negative values to get backward values too
回答16:
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]);
回答17:
In swift you can make extension to add method in NSDate
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)
}
}
you can use this as
NSDate().addNoOfDays(3)
回答18:
NSDateComponents *dayComponent = [[[NSDateComponents alloc] init] autorelease];
dayComponent.day = 1;
NSCalendar *theCalendar = [NSCalendar currentCalendar];
dateToBeIncremented = [theCalendar dateByAddingComponents:dayComponent toDate:dateToBeIncremented options:0];
Ok - I thought this was going to work for me. However, if you use it to add a day to the 31st March 2013, it'll return a date that has only 23 hours added to it. It may well actually have the 24, but using in calculations has only 23:00 hours added.
Similarly, if you blast forward to 28th Oct 2013, the code adds 25 hours resulting in a date time of 2013-10-28 01:00:00.
In order to add a day I was doing the thing at the top, adding the:
NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd];
Complicated, principally due to daylight saving.
回答19:
for swift 2.2:
let today = NSDate()
let tomorrow = NSCalendar.currentCalendar().dateByAddingUnit(
.Day,
value: 1,
toDate: today,
options: NSCalendarOptions.MatchStrictly)
Hope this helps someone!
回答20:
Swift 4, if all you really need is a 24 hour shift (60*60*24 seconds) and not "1 calendar day"
Future:
let dayAhead = Date(timeIntervalSinceNow: TimeInterval(86400.0))
Past:
let dayAgo = Date(timeIntervalSinceNow: TimeInterval(-86400.0))
回答21:
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);
回答22:
I had the same problem; use an extension for NSDate:
- (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];
}
回答23:
Swift 2.0
let today = NSDate()
let calendar = NSCalendar.currentCalendar()
let tomorrow = calendar.dateByAddingUnit(.Day, value: 1, toDate: today, options: NSCalendarOptions.MatchFirst)
回答24:
Use following code:
NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd];
As
addTimeInterval
is now deprecated.
来源：https://stackoverflow.com/questions/5067785/how-do-i-add-1-day-to-an-nsdate