How do I add 1 day to an NSDate?
Basically, as the title says. I'm wondering how I could add 1 day to an NSDate.
So if it were:
21st February 20开发者_运维技巧11
It would become:
22nd February 2011
Or if it were:
31st December 2011
It would become:
1st January 2012.
Swift 5.0 :
var dayComponent = DateComponents()
dayComponent.day = 1 // For removing one day (yesterday): -1
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
print("nextDate : \(nextDate)")
Objective C :
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.
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)
Swift 5
let today = Date()
let nextDate = Calendar.current.date(byAdding: .day, value: 1, to: today)
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];
iOS 8+, OSX 10.9+, Objective-C
NSCalendar *cal = [NSCalendar currentCalendar];
NSDate *tomorrow = [cal dateByAddingUnit:NSCalendarUnitDay
value:1
toDate:[NSDate date]
options:0];
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)
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)
Update for Swift 4:
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
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;
}
In swift
var dayComponenet = NSDateComponents()
dayComponenet.day = 1
var theCalendar = NSCalendar.currentCalendar()
var nextDate = theCalendar.dateByAddingComponents(dayComponenet, toDate: NSDate(), options: nil)
It works!
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];
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)!
}
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.
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];
Simple Swift extensions for yesterday and tomorrow from any date:
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)!
}
}
I'm force unwrapping the optionals based on advice in the question here:
When does dateByAddingComponents:toDate:options return nil?
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)
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
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.
You can use NSDate's method - (id)dateByAddingTimeInterval:(NSTimeInterval)seconds where seconds would be 60 * 60 * 24 = 86400
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)
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]);
for swift 2.2:
let today = NSDate()
let tomorrow = NSCalendar.currentCalendar().dateByAddingUnit(
.Day,
value: 1,
toDate: today,
options: NSCalendarOptions.MatchStrictly)
Hope this helps someone!
update for swift 5
let nextDate = fromDate.addingTimeInterval(60*60*24)
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);
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];
}
Swift 2.0
let today = NSDate()
let calendar = NSCalendar.currentCalendar()
let tomorrow = calendar.dateByAddingUnit(.Day, value: 1, toDate: today, options: NSCalendarOptions.MatchFirst)
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))
String extension: Convert String_Date > Date
extension String{
func DateConvert(oldFormat:String)->Date{ // format example: yyyy-MM-dd HH:mm:ss
let isoDate = self
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US_POSIX") // set locale to reliable US_POSIX
dateFormatter.dateFormat = oldFormat
return dateFormatter.date(from:isoDate)!
}
}
Date extension: Convert Date > String
extension Date{
func DateConvert(_ newFormat:String)-> String{
let formatter = DateFormatter()
formatter.dateFormat = newFormat
return formatter.string(from: self)
}
}
Date extension: Get +/- Date
extension String{
func next(day:Int)->Date{
var dayComponent = DateComponents()
dayComponent.day = day
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
return nextDate!
}
func past(day:Int)->Date{
var pastCount = day
if(pastCount>0){
pastCount = day * -1
}
var dayComponent = DateComponents()
dayComponent.day = pastCount
let theCalendar = Calendar.current
let nextDate = theCalendar.date(byAdding: dayComponent, to: Date())
return nextDate!
}
}
Usage:
let today = Date()
let todayString = "2020-02-02 23:00:00"
let newDate = today.DateConvert("yyyy-MM-dd HH:mm:ss") //2020-02-02 23:00:00
let newToday = todayString.DateConvert(oldFormat: "yyyy-MM-dd HH:mm:ss")//2020-02-02
let newDatePlus = today.next(day: 1)//2020-02-03 23:00:00
let newDateMinus = today.past(day: 1)//2020-02-01 23:00:00
reference: from multiple question
How do I add 1 day to an NSDate?
math function to convert positive int to negative and negative to positive?
Converting NSString to NSDate (and back again)
In Swift 4 or Swift 5, you can use 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)
output:
Current date: 2020-03-02
yesterday date: 2020-03-01
Just for fun, with a few extensions and operator overloads, you can end up with something nice, like:
let today = Date()
let tomorrow = today + 1.days
, or
var date = Date()
date += 1.months
Below is the support code:
extension Calendar {
struct ComponentWithValue {
let component: Component
let value: Int
}
}
extension Int {
var days: Calendar.ComponentWithValue {
.init(component: .day, value: self)
}
var months: Calendar.ComponentWithValue {
.init(component: .month, value: self)
}
}
func +(_ date: Date, _ amount: Calendar.ComponentWithValue) -> Date {
Calendar.current.date(byAdding: amount.component, value: amount.value, to: date)!
}
func +(_ amount: Calendar.ComponentWithValue, _ date: Date) -> Date {
date + amount
}
func +=(_ date: inout Date, _ amount: Calendar.ComponentWithValue) {
date = date + amount
}
The code is minimal, and can be easily extended to allow .months, .years, .hours, etc. Also support for subtraction (-) can be seamlessly added.
There is a forced unwrap, though, within the implementation of the + operator, however not sure under which circumstances can the calendar return a nil date.
Use following code:
NSDate *now = [NSDate date];
int daysToAdd = 1;
NSDate *newDate1 = [now dateByAddingTimeInterval:60*60*24*daysToAdd];
As
addTimeInterval
is now deprecated.
加载中,请稍侯......
精彩评论