Is it possible to get an array of Date for each day of a given Month and Year from Calendar components (Swift 3)
Currently I just find a way to get a count of days but nothing more.
The purpose is to develop my custom calendar but I get stuck to this phase...
The extension I'm trying to write will look like this:
extension Date
{
func getAllDays() -> [Date]
}
Or a method like that:
func getAllDays(month: Int, year: Int) -> [Date]
Finally I find a way to do it:
extension Date
{
mutating func addDays(n: Int)
{
let cal = Calendar.current
self = cal.date(byAdding: .day, value: n, to: self)!
}
func firstDayOfTheMonth() -> Date {
return Calendar.current.date(from:
Calendar.current.dateComponents([.year,.month], from: self))!
}
func getAllDays() -> [Date]
{
var days = [Date]()
let calendar = Calendar.current
let range = calendar.range(of: .day, in: .month, for: self)!
var day = firstDayOfTheMonth()
for _ in 1...range.count
{
days.append(day)
day.addDays(n: 1)
}
return days
}
}
Usage example:
let allDays = Date().getAllDays()
output:
2017-06-01 22:00:00 +0000
2017-06-02 22:00:00 +0000
2017-06-03 22:00:00 +0000
2017-06-04 22:00:00 +0000
...
...
2017-06-30 22:00:00 +0000
Here a little bit better code for doing the same
extension Date {
var startOfMonth: Date {
return Calendar.iso8601.date(from: Calendar.iso8601.dateComponents([.year, .month], from: self))!
}
var daysOfMonth: [Date] {
let startOfMonth = self.startOfMonth
let calendar = Calendar.current
let range = calendar.range(of: .day, in: .month, for: self)!
return range.compactMap{ calendar.date(byAdding: .day, value: $0, to: startOfMonth)}
}
}
extension Calendar {
static let iso8601 = Calendar(identifier: .iso8601)
}
Related
I am new to Swift and I have not worked with NSDate. For my app I need how to make to calculate how many days there are until the event. The date of the event is written with DatePicker on Firebase, and I need to calculate from the current date how many days are left until the day it's written. All I need is to count down the days.
Convert your data from DatePicker to Date object, and you can use the following function which returns an Int, a representation of the number of days to a passed date.
func daysTo(date: Date) -> Int? {
let calendar = Calendar.current
let date1 = calendar.startOfDay(for: Date())
let date2 = calendar.startOfDay(for: date)
let components = calendar.dateComponents([.day], from: date1, to: date2)
return components.day
}
you can use this extension for find difference between date:
extension Date {
public func diffrenceTime() -> (Int, Int) {
var cal = Calendar.init(identifier: .persian)
let d1 = Date()
let components = cal.dateComponents([.hour, .minute], from: self, to: d1)
let diffHour = components.hour!
let diffMinute = components.minute!
return (diffHour, diffMinute)
}
public func fullDistance(from date: Date, resultIn component: Calendar.Component, calendar: Calendar = .current) -> Int? {
calendar.dateComponents([component], from: self, to: date).value(for: component)
}
public func distance(from date: Date, only component: Calendar.Component, calendar: Calendar = .current) -> Int {
let days1 = calendar.component(component, from: self)
let days2 = calendar.component(component, from: date)
return days1 - days2
}
public func hasSame(_ component: Calendar.Component, as date: Date) -> Bool {
self.distance(from: date, only: component) == 0
}
}
example for use:
let dateOne = Date() // or any date
let dateTwo = getDateFromServer // your second date for
// option One
let distanceDay = dateOne.fullDistance(from: dateTwo, resultIn: .day)
var cal = Calendar.current // for your calendar
cal.locale = Locale.init(identifier: "EN")
// option Two
let distanceDay = dateOne.fullDistance(from: dateTwo, resultIn: .day, calendar: cal)
you can set hour, minute or any Component for find difference instead of day in result parameter
I have to implement graph so that I need to get week start date and weekend date if I will pass the date object and week number.
How can I achieve that I tried it but didn't get exactly?
Here below is my code:-
Weekday:-
//Day of week
func getDayOfWeek(today:String)->Int? {
let formatter = DateFormatter()
formatter.dateFormat = "yyyy-MM-dd"
if let todayDate = formatter.date(from: today) {
let myCalendar = NSCalendar(calendarIdentifier: NSCalendar.Identifier.gregorian)!
let myComponents = myCalendar.components(.weekday, from: todayDate)
let weekDay = myComponents.weekday
return weekDay
} else {
return nil
}
}.
extension Date {
var millisecondsSince1970:Int {
return Int((self.timeIntervalSince1970 * 1000.0).rounded())
}
init(milliseconds:Int) {
self = Date(timeIntervalSince1970: TimeInterval(milliseconds / 1000))
}
func startOfWeek(weekday: Int?) -> Date {
var cal = Calendar.current
var component = cal.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)
component.to12am()
cal.firstWeekday = weekday ?? 1
return cal.date(from: component)!
}
func endOfWeek(weekday: Int) -> Date {
let cal = Calendar.current
var component = DateComponents()
component.weekOfYear = 1
component.day = -1
component.to12pm()
return cal.date(byAdding: component, to: startOfWeek(weekday: weekday))!
}
}
internal extension DateComponents {
mutating func to12am() {
self.hour = 0
self.minute = 0
self.second = 0
}
mutating func to12pm(){
self.hour = 23
self.minute = 59
self.second = 59
}
}
This returns start- and end date for a given week number and date
func dayRangeOf(weekOfYear: Int, for date: Date) -> Range<Date>
{
let calendar = Calendar.current
let year = calendar.component(.yearForWeekOfYear, from: date)
let startComponents = DateComponents(weekOfYear: weekOfYear, yearForWeekOfYear: year)
let startDate = calendar.date(from: startComponents)!
let endComponents = DateComponents(day:7, second: -1)
let endDate = calendar.date(byAdding: endComponents, to: startDate)!
return startDate..<endDate
}
print(dayRangeOf(weekOfYear: 12, for: Date()))
Consider that print displays the dates in UTC and the start date depends on the first weekday setting of the current locale.
Edit
A version to determine the range of a given week of month
func dayRangeOf(weekOfMonth: Int, year: Int, month: Int) -> Range<Date>? {
let calendar = Calendar.current
guard let startOfMonth = calendar.date(from: DateComponents(year:year, month:month)) else { return nil }
var startDate = Date()
if weekOfMonth == 1 {
var interval = TimeInterval()
guard calendar.dateInterval(of: .weekOfMonth, start: &startDate, interval: &interval, for: startOfMonth) else { return nil }
} else {
let nextComponents = DateComponents(year: year, month: month, weekOfMonth: weekOfMonth)
guard let weekStartDate = calendar.nextDate(after: startOfMonth, matching: nextComponents, matchingPolicy: .nextTime) else {
return nil
}
startDate = weekStartDate
}
let endComponents = DateComponents(day:7, second: -1)
let endDate = calendar.date(byAdding: endComponents, to: startDate)!
return startDate..<endDate
}
print(dayRangeOf(weekOfMonth: 5, year: 2017, month: 6))
The result type of the second version is an optional because there are a few calculations which could fail for example if the number of week in the particular month is out of range.
For anyone interested in this, it looks like OP confusing weekOfMonth and weekOfYear…
//: Playground - noun: a place where people can play
import UIKit
var str = "Hello, playground"
let cal = Calendar.current
let dateComponents = DateComponents(year: 2018, month: 3, day: 15)
let date = cal.date(from: dateComponents)!
func weekOfMonthStart(forDate date: Date) -> Date {
var compsToWeekOfMonth = cal.dateComponents([.year, .month, .weekOfYear], from: date)
compsToWeekOfMonth.day = cal.range(of: .day, in: .weekOfMonth, for: date)?.lowerBound
return cal.date(from: compsToWeekOfMonth)!
}
Somebody mention an answer that will fail, so a test was included ;)
for i in 0...5000 {
let newDate = cal.date(byAdding: DateComponents(day:i), to: date)!
weekOfMonthStart(forDate: newDate)
}
I'm trying to get the start and end dates of the current month in dd/MM/yyyy format. I tried using extension as answered in this SO Question.But it seems like it's not what I want(the format is different and also it's giving me last month's last date and current month last but one date ). Can some one help me.
Extension Class:
extension Date {
func startOfMonth() -> Date? {
let comp: DateComponents = Calendar.current.dateComponents([.year, .month, .hour], from: Calendar.current.startOfDay(for: self))
return Calendar.current.date(from: comp)!
}
func endOfMonth() -> Date? {
var comp: DateComponents = Calendar.current.dateComponents([.month, .day, .hour], from: Calendar.current.startOfDay(for: self))
comp.month = 1
comp.day = -1
return Calendar.current.date(byAdding: comp, to: self.startOfMonth()!)
}
}
My Struct:
struct Constants{
// keys required for making a Login call (POST Method)
struct LoginKeys {
.....
}
struct RankingKeys {
static let DateFrom = String(describing: Date().startOfMonth()) //giving me 2016-11-30 16:00:00 +0000
static let DateTo = String(describing: Date().endOfMonth())
//2016-12-30 16:00:00 +0000
}
}
Expected Result:
DateFrom = "01/12/2016"
DateTo = "31/12/2016"
You should write this simple code:
let dateFormatter = DateFormatter()
let date = Date()
dateFormatter.dateFormat = "dd-MM-yyyy"
For start Date:
let comp: DateComponents = Calendar.current.dateComponents([.year, .month], from: date)
let startOfMonth = Calendar.current.date(from: comp)!
print(dateFormatter.string(from: startOfMonth))
For end Date:
var comps2 = DateComponents()
comps2.month = 1
comps2.day = -1
let endOfMonth = Calendar.current.date(byAdding: comps2, to: startOfMonth)
print(dateFormatter.string(from: endOfMonth!))
This is what I'm using. Pretty simple but it works.
extension Calendar {
func dayOfWeek(_ date: Date) -> Int {
var dayOfWeek = self.component(.weekday, from: date) + 1 - self.firstWeekday
if dayOfWeek <= 0 {
dayOfWeek += 7
}
return dayOfWeek
}
func startOfWeek(_ date: Date) -> Date {
return self.date(byAdding: DateComponents(day: -self.dayOfWeek(date) + 1), to: date)!
}
func endOfWeek(_ date: Date) -> Date {
return self.date(byAdding: DateComponents(day: 6), to: self.startOfWeek(date))!
}
func startOfMonth(_ date: Date) -> Date {
return self.date(from: self.dateComponents([.year, .month], from: date))!
}
func endOfMonth(_ date: Date) -> Date {
return self.date(byAdding: DateComponents(month: 1, day: -1), to: self.startOfMonth(date))!
}
func startOfQuarter(_ date: Date) -> Date {
let quarter = (self.component(.month, from: date) - 1) / 3 + 1
return self.date(from: DateComponents(year: self.component(.year, from: date), month: (quarter - 1) * 3 + 1))!
}
func endOfQuarter(_ date: Date) -> Date {
return self.date(byAdding: DateComponents(month: 3, day: -1), to: self.startOfQuarter(date))!
}
func startOfYear(_ date: Date) -> Date {
return self.date(from: self.dateComponents([.year], from: date))!
}
func endOfYear(_ date: Date) -> Date {
return self.date(from: DateComponents(year: self.component(.year, from: date), month: 12, day: 31))!
}
}
How to use
let calendar: Calendar = Calendar.current
let startDate = calendar.startOfMonth(Date())
print("startDate :: \(startDate)")
Here is an easy solution in create an extension for Date like following:
extension Date {
func startOfMonth() -> Date {
let interval = Calendar.current.dateInterval(of: .month, for: self)
return (interval?.start.toLocalTime())! // Without toLocalTime it give last months last date
}
func endOfMonth() -> Date {
let interval = Calendar.current.dateInterval(of: .month, for: self)
return interval!.end
}
// Convert UTC (or GMT) to local time
func toLocalTime() -> Date {
let timezone = TimeZone.current
let seconds = TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}}
And then call with your Date instance like that
print(Date().startOfMonth())
print(Date().endOfMonth())
With Swift 3 & iOS 10 the easiest way I found to do this is Calendar's dateInterval(of:for:):
guard let interval = calendar.dateInterval(of: .month, for: Date()) else { return }
Then use a date formatter to print the dates:
let formatter = DateFormatter()
formatter.dateFormat = "dd-MM-yyyy"
let dateText = formatter.string(from: interval.start)
This Extension Gives you expected output as per you want
Here I return date
extension NSDate {
func startOfMonth() -> NSDate? {
guard
let cal: NSCalendar = NSCalendar.currentCalendar(),
let comp: NSDateComponents = cal.components([.Year, .Month], fromDate: self) else { return nil }
comp.to12pm()
let dateformattor = NSDateFormatter()
dateformattor.dateFormat = "yyyy-MM-dd"
dateformattor.timeZone = NSTimeZone.localTimeZone()
let dt2 = dateformattor.stringFromDate(cal.dateFromComponents(comp)!)
print(dt2)
dateformattor.dateFormat = "yyyy-MM-dd"
dateformattor.timeZone = NSTimeZone.init(abbreviation: "UTC")
return dateformattor.dateFromString(dt2)
}
func endOfMonth() -> NSDate? {
guard
let cal: NSCalendar = NSCalendar.currentCalendar(),
let comp: NSDateComponents = NSDateComponents() else { return nil }
comp.month = 1
comp.day = -1
comp.to12pm()
let dateformattor = NSDateFormatter()
dateformattor.dateFormat = "yyyy-MM-dd"
dateformattor.timeZone = NSTimeZone.localTimeZone()
let dt2 = dateformattor.stringFromDate(cal.dateByAddingComponents(comp, toDate: self.startOfMonth()!, options: [])!)
dateformattor.dateFormat = "yyyy-MM-dd"
dateformattor.timeZone = NSTimeZone.init(abbreviation: "UTC")
return dateformattor.dateFromString(dt2)
}
}
internal extension NSDateComponents {
func to12pm() {
self.hour = 12
self.minute = 0
self.second = 0
}
}
**OUTPUT :- **
Start Date of Month :- 2016-12-01 00:00:00 +0000
End Date of Month :- 2016-12-31 00:00:00 +0000
For the sake of completeness, the API dateInterval(of:start:interval:for:) of Calendar assigns the start date and interval (in seconds) of the current month to the inout parameters.
The date formatter considers the current time zone.
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "dd/MM/yyyy"
var startDate = Date()
var interval = TimeInterval()
Calendar.current.dateInterval(of: .month, start: &startDate, interval: &interval, for: Date())
let endDate = Calendar.current.date(byAdding: .second, value: Int(interval) - 1, to: startDate)!
let fromDate = formatter.string(from: startDate)
let toDate = formatter.string(from: endDate)
print(fromDate, toDate)
I need to translate this function into swift.
Basically what does it get the 'n' day of the current week. So for example if i use it with NSDate().getWeekDay(0) it gives me Sun 11 Sept, and so on.
But seems rangeOfUnit no longer exists in Swift-3.
This was my previous implementation in Swift-2
extension NSDate {
func getWeekDay(day: Int) -> NSDate {
var beginningOfWeek: NSDate?
NSCalendar.currentCalendar().rangeOfUnit(NSCalendarUnit.WeekOfYear, startDate: &beginningOfWeek, interval: nil, forDate: self)
let comps = NSDateComponents()
comps.day = day
comps.minute = NSCalendar.currentCalendar().component(NSCalendarUnit.Minute, fromDate: self)
comps.hour = NSCalendar.currentCalendar().component(NSCalendarUnit.Hour, fromDate: self)
let nextDate = NSCalendar.currentCalendar().dateByAddingComponents(comps, toDate: beginningOfWeek!, options: .SearchBackwards)
return nextDate!
}
}
There is an alternative to get the start of the week which
translates directly to Swift 3:
extension Date {
func getWeekDay(day: Int) -> Date {
let cal = Calendar.current
let comps = cal.dateComponents([.weekOfYear, .yearForWeekOfYear], from: self)
let beginningOfWeek = cal.date(from: comps)!
let nextDate = cal.date(byAdding: .day, value: day, to: beginningOfWeek)!
return nextDate
}
}
This is your extension in Swift 3 for Date and a bit optimized
extension Date {
func getWeekDay(day: Int) -> Date {
var beginningOfWeek = Date()
var interval : TimeInterval = 0
let currentCalendar = Calendar.current
currentCalendar.dateInterval(of: .weekOfYear, start: &beginningOfWeek, interval: &interval, for: self)
return currentCalendar.date(byAdding: .day, value: day, to: beginningOfWeek)!
}
}
rangeOfUnit(startDate:interval:forDate:) has been turned into dateInterval(of:start:interval:for:) in the new Calendar structure.
I'm trying to get the first and last day of the month in swift.
So far I have the following:
let dateFormatter = NSDateFormatter()
let date = NSDate()
dateFormatter.dateFormat = "yyyy-MM-dd"
let calendar = NSCalendar.currentCalendar()
let components = calendar.components([.Year, .Month, .Day, .Hour, .Minute, .Second], fromDate: date)
let month = components.month
let year = components.year
let startOfMonth = ("\(year)-\(month)-01")
But I'm not sure how to get the last date. Is there a built in method I'm missing? Obviously it has to take into account leap years etc.
Swift 3 and 4 drop-in extensions
This actually gets a lot easier with Swift 3+:
You can do it without guard (you could if you wanted to, but because DateComponents is a non-optional type now, it's no longer necessary).
Using iOS 8's startOfDayForDate (now startOfDay), you don't need to manually set the time to 12pm unless you're doing some really crazy calendar calculations across time zones.
It's worth mentioning that some of the other answers claim you can shortcut this by using Calendar.current.date(byAdding: .month, value: 0, to: Date())!, but where this fails, is that it doesn't actually zero out the day, or account for differences in timezones.
Here you go:
extension Date {
func startOfMonth() -> Date {
return Calendar.current.date(from: Calendar.current.dateComponents([.year, .month], from: Calendar.current.startOfDay(for: self)))!
}
func endOfMonth() -> Date {
return Calendar.current.date(byAdding: DateComponents(month: 1, day: -1), to: self.startOfMonth())!
}
}
print(Date().startOfMonth()) // "2018-02-01 08:00:00 +0000\n"
print(Date().endOfMonth()) // "2018-02-28 08:00:00 +0000\n"
You get the first day of the month simply with
let components = calendar.components([.Year, .Month], fromDate: date)
let startOfMonth = calendar.dateFromComponents(components)!
print(dateFormatter.stringFromDate(startOfMonth)) // 2015-11-01
To get the last day of the month, add one month and subtract one day:
let comps2 = NSDateComponents()
comps2.month = 1
comps2.day = -1
let endOfMonth = calendar.dateByAddingComponents(comps2, toDate: startOfMonth, options: [])!
print(dateFormatter.stringFromDate(endOfMonth)) // 2015-11-30
Alternatively, use the rangeOfUnit method which gives you
the start and the length of the month:
var startOfMonth : NSDate?
var lengthOfMonth : NSTimeInterval = 0
calendar.rangeOfUnit(.Month, startDate: &startOfMonth, interval: &lengthOfMonth, forDate: date)
For a date on the last day of month, add the length of the month minus one second:
let endOfMonth = startOfMonth!.dateByAddingTimeInterval(lengthOfMonth - 1)
Updated for Swift5:
extension Date {
var startOfDay: Date {
return Calendar.current.startOfDay(for: self)
}
var startOfMonth: Date {
let calendar = Calendar(identifier: .gregorian)
let components = calendar.dateComponents([.year, .month], from: self)
return calendar.date(from: components)!
}
var endOfDay: Date {
var components = DateComponents()
components.day = 1
components.second = -1
return Calendar.current.date(byAdding: components, to: startOfDay)!
}
var endOfMonth: Date {
var components = DateComponents()
components.month = 1
components.second = -1
return Calendar(identifier: .gregorian).date(byAdding: components, to: startOfMonth)!
}
func isMonday() -> Bool {
let calendar = Calendar(identifier: .gregorian)
let components = calendar.dateComponents([.weekday], from: self)
return components.weekday == 2
}
}
With Swift 3 & iOS 10 the easiest way I found to do this is Calendar's dateInterval(of:for:):
guard let interval = calendar.dateInterval(of: .month, for: Date()) else { return }
You can then use interval.start and interval.end to get the dates you need.
Swift 3
Many date example for :
Last 6 month,
last 3 month,
yesterday, last 7 day, last 30 day, previous month,
current month start & end, last month start & end date
let startDate = dateFormatter.string(from: Date().getThisMonthStart()!)
let endDate = dateFormatter.string(from: Date().getThisMonthEnd()!)
extension Date {
func getLast6Month() -> Date? {
return Calendar.current.date(byAdding: .month, value: -6, to: self)
}
func getLast3Month() -> Date? {
return Calendar.current.date(byAdding: .month, value: -3, to: self)
}
func getYesterday() -> Date? {
return Calendar.current.date(byAdding: .day, value: -1, to: self)
}
func getLast7Day() -> Date? {
return Calendar.current.date(byAdding: .day, value: -7, to: self)
}
func getLast30Day() -> Date? {
return Calendar.current.date(byAdding: .day, value: -30, to: self)
}
func getPreviousMonth() -> Date? {
return Calendar.current.date(byAdding: .month, value: -1, to: self)
}
// This Month Start
func getThisMonthStart() -> Date? {
let components = Calendar.current.dateComponents([.year, .month], from: self)
return Calendar.current.date(from: components)!
}
func getThisMonthEnd() -> Date? {
let components:NSDateComponents = Calendar.current.dateComponents([.year, .month], from: self) as NSDateComponents
components.month += 1
components.day = 1
components.day -= 1
return Calendar.current.date(from: components as DateComponents)!
}
//Last Month Start
func getLastMonthStart() -> Date? {
let components:NSDateComponents = Calendar.current.dateComponents([.year, .month], from: self) as NSDateComponents
components.month -= 1
return Calendar.current.date(from: components as DateComponents)!
}
//Last Month End
func getLastMonthEnd() -> Date? {
let components:NSDateComponents = Calendar.current.dateComponents([.year, .month], from: self) as NSDateComponents
components.day = 1
components.day -= 1
return Calendar.current.date(from: components as DateComponents)!
}
}
Swift 4
If you only need the ordinal day:
func lastDay(ofMonth m: Int, year y: Int) -> Int {
let cal = Calendar.current
var comps = DateComponents(calendar: cal, year: y, month: m)
comps.setValue(m + 1, for: .month)
comps.setValue(0, for: .day)
let date = cal.date(from: comps)!
return cal.component(.day, from: date)
}
lastDay(ofMonth: 2, year: 2018) // 28
lastDay(ofMonth: 2, year: 2020) // 29
This is the simplest way that I found (Swift 5+):
extension Date {
func getStart(of component: Calendar.Component, calendar: Calendar = Calendar.current) -> Date? {
return calendar.dateInterval(of: component, for: self)?.start
}
func getEnd(of component: Calendar.Component, calendar: Calendar = Calendar.current) -> Date? {
return calendar.dateInterval(of: component, for: self)?.end
}
}
Here is easiest solution:
extension Date {
func startOfMonth() -> Date {
let interval = Calendar.current.dateInterval(of: .month, for: self)
return (interval?.start.toLocalTime())! // Without toLocalTime it give last months last date
}
func endOfMonth() -> Date {
let interval = Calendar.current.dateInterval(of: .month, for: self)
return interval!.end
}
// Convert UTC (or GMT) to local time
func toLocalTime() -> Date {
let timezone = TimeZone.current
let seconds = TimeInterval(timezone.secondsFromGMT(for: self))
return Date(timeInterval: seconds, since: self)
}}
and then call these with your date instance:
print(Date().startOfMonth())
print(Date().endOfMonth())
2017...
First, get the month you need:
let cal = Calendar.current
let d = Calendar.current.date(byAdding: .month, value: 0, to: Date())!
// for "last month" just use -1, for "next month" just use 1, etc
To get the day-of-the-week for the first day of the month:
let c = cal.dateComponents([.year, .month], from: d)
let FDOM = cal.date(from: c)!
let dowFDOM = cal.component(.weekday, from: FDOM)
print("the day-of-week on the 1st is ... \(dowFDOM)")
// so, that's 1=Sunday, 2=Monday, etc.
To get the number of days in the month:
let r = cal.range(of: .day, in: .month, for: d)!
let kDays = r.count
print("the number of days is ... \(kDays)")
With Swift 3, you can choose one of the two following patters in order to retrieve the first and last days of a month.
#1. Using Calendar dateComponents(_:from:), date(from:) and date(byAdding:to:wrappingComponents:) methods
With this pattern, you first get the date of the first day of a month then add a month and remove a day from it in order to get the date of the last day of the month. The Playground code below shows how to set it:
import Foundation
// Set calendar and date
let calendar = Calendar.current
let date = calendar.date(byAdding: DateComponents(day: -10), to: Date())!
// Get first day of month
let firstDayComponents = calendar.dateComponents([.year, .month], from: date)
let firstDay = calendar.date(from: firstDayComponents)!
// Get last day of month
let lastDayComponents = DateComponents(month: 1, day: -1)
let lastDay = calendar.date(byAdding: lastDayComponents, to: firstDay)!
// Set date formatter
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_UK")
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .long
// Print results
print(dateFormatter.string(from: date)) // Prints: 22 March 2017 at 18:07:15 CET
print(dateFormatter.string(from: firstDay)) // Prints: 1 March 2017 at 00:00:00 CET
print(dateFormatter.string(from: lastDay)) // Prints: 31 March 2017 at 00:00:00 CEST
#2. Using Calendar range(of:in:for:), dateComponents(_:from:) and date(from:) and methods
With this pattern, you get a range of absolute day values in a month and then retrieve the dates of the first day and last day of the month from it. The Playground code below shows how to set it:
import Foundation
// Set calendar and date
let calendar = Calendar.current
let date = calendar.date(byAdding: DateComponents(day: -10), to: Date())!
// Get range of days in month
let range = calendar.range(of: .day, in: .month, for: date)! // Range(1..<32)
// Get first day of month
var firstDayComponents = calendar.dateComponents([.year, .month], from: date)
firstDayComponents.day = range.lowerBound
let firstDay = calendar.date(from: firstDayComponents)!
// Get last day of month
var lastDayComponents = calendar.dateComponents([.year, .month], from: date)
lastDayComponents.day = range.upperBound - 1
//lastDayComponents.day = range.count // also works
let lastDay = calendar.date(from: lastDayComponents)!
// Set date formatter
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_UK")
dateFormatter.dateStyle = .long
dateFormatter.timeStyle = .long
// Print results
print(dateFormatter.string(from: date)) // prints: 22 March 2017 at 18:07:15 CET
print(dateFormatter.string(from: firstDay)) // prints: 1 March 2017 at 00:00:00 CET
print(dateFormatter.string(from: lastDay)) // prints: 31 March 2017 at 00:00:00 CEST
In swift 3, if you put 0 to day component you can get the last day of the month. There's an example code:
public func isMoreDays(date: Date, asc: Bool)->Bool{
//components
var dayComponents = self.getDateComponents(date: date)
//asc is true if ascendant or false if descendant
dayComponents.day = asc ? 0 : 1
//plus 1 to month 'cos if you set up day to 0 you are going to the previous month
dayComponents.month = asc ? dayComponents.month! + 1 : dayComponents.month
//instantiate calendar and get the date
let calendar : Calendar = NSCalendar.current
let day = calendar.date(from: dayComponents)
//date comparison
if(day?.compare(date) == .orderedSame){
return false
}
return true
}
You can use the following extensions here :
let today = Date()
let startOfMonth = today.beginning(of: .month)
let endOfMonth = today.end(of: .month)