I'm trying to calculate the time from now (i.e. Date()) till the next 5pm.
If the current time is 3pm, the output will be 02:00:00. (in HH:MM:SS)
If the current time is 6pm, the output will be 23:00:00. (until the next 5pm!)
How do I do that in Swift 3?
Thanks.
You can use Calendar.nextDate to find the Date of the coming 5pm.
let now = Date()
let calendar = Calendar.current
let components = DateComponents(calendar: calendar, hour: 17) // <- 17:00 = 5pm
let next5pm = calendar.nextDate(after: now, matching: components, matchingPolicy: .nextTime)!
then, just compute the different between next5pm and now using dateComponents(_:from:to:).
let diff = calendar.dateComponents([.hour, .minute, .second], from: now, to: next5pm)
print(diff)
// Example outputs:
// hour: 2 minute: 21 second: 39 isLeapMonth: false
// hour: 23 minute: 20 second: 10 isLeapMonth: false
func tommorrow5() ->Date {
var todayAt5 = Calendar.current.dateComponents([.year,.month,.day,.hour], from: Date() )
todayAt5.hour = 17
let dateToDisplay = Calendar.current.date(from: todayAt5)
return Calendar.current.date(byAdding: .day , value: 1, to: dateToDisplay!)! }
func showTimeDifference()->DateComponents{
var todayAt5 = Calendar.current.dateComponents([.year,.month,.day,.hour], from: Date() )
todayAt5.hour = 17
let dateToDisplay = Calendar.current.date(from: todayAt5)
let now = Date()
switch now.compare(dateToDisplay!) {
case .orderedAscending : // now is earlier than 5pm
return Calendar.current.dateComponents([Calendar.Component.hour, Calendar.Component.minute, Calendar.Component.second], from: Date(), to: dateToDisplay!)
case .orderedDescending : // now is later than 5 pm
return Calendar.current.dateComponents([Calendar.Component.hour, Calendar.Component.minute, Calendar.Component.second], from: Date(), to: tommorrow5())
case .orderedSame : break // now is 5 pm
}
return Calendar.current.dateComponents([Calendar.Component.hour, Calendar.Component.minute, Calendar.Component.second], from: Date(), to: dateToDisplay!)
}
you can use it just like this
it will return time to 5pm today
if its already passed 5pm will return time to 5pm tomorrow
showTimeDifference()
Related
I have the following range:
Weekday Hour:Minute --> Weekday Hour:Minute
Weekday is an integer from 1 (Monday) to 7 (Sunday)
For example, a given range can be the following:
Monday 8:00 --> Friday 18:00
Saturday 10:00 --> Tuesday 10:00
Monday 10:00 --> Monday 20:00 (Just 10 hours on Monday)
Monday 20:00 --> Monday 10:00 (All week except Monday from 10:00 to 20:00)
I'm trying to find if the current date is in the selected range.
I tried multiple ways like creating NSDates from the ranges and comparing them but it still didn't pass all the tests.
You could do something like this:
First create the start and end dates from hour, minute and weekday. If start date results after end date go back to 1 week. Then compare the current date to start and end dates calculated to see if it is in range.
let currentDate = Date()
var startDate = dateBySetting(hour: 8, minute: 0, weekday: 1, of: currentDate)
let endDate = dateBySetting(hour: 9, minute: 0, weekday: 5, of: currentDate)
// If start date results after end date remove a week from the start
if startDate > endDate {
startDate = Calendar.current.date(byAdding: .weekOfYear, value: -1, to: startDate) ?? startDate
}
let dateIsInRange = startDate <= currentDate && currentDate <= endDate
func dateBySetting(hour: Int, minute: Int, weekday: Int, of date: Date) -> Date {
let calendar = Calendar.current
var date = calendar.date(bySettingHour: hour, minute: minute, second: 0, of: date) ?? date
date = calendar.date(bySetting: .weekday, value: weekday, of: date) ?? date
return date
}
It can be done using Calendar's nextDate function.
Eg: here I am checking if my current time falls in between Monday 8:00 --> Friday 18:00
//Monday 8:00 --> Friday 18:00
let currentDate = Date()
let calendar = Calendar.current
let yearComponent = (calendar.dateComponents(in: .current, from: Date()).year)!
let monthComponent = (calendar.dateComponents(in: .current, from: Date()).month)!
let previousTime = calendar.nextDate(after: currentDate,
matching: DateComponents(calendar: calendar, timeZone: .current, year: yearComponent, month: monthComponent, hour: 8, minute: 0, weekday: 2),
matchingPolicy: .strict,
repeatedTimePolicy: .first,
direction: .backward)
print(previousTime)
let nextTime = calendar.nextDate(after: previousTime!,
matching: DateComponents(calendar: calendar, timeZone: .current, year: yearComponent, month: monthComponent, hour: 18, minute: 0, weekday: 6),
matchingPolicy: .strict,
repeatedTimePolicy: .first,
direction: .forward)
print(nextTime)
print(currentDate > previousTime! && currentDate < nextTime!) //true
A solution is to use date components. Your last example Monday 20:00 --> Monday 10:00 is
let startComponents = DateComponents(hour:20, minute:0, weekday:1)
let endComponents = DateComponents(hour:10, minute:0, weekday:1)
Then get the next occurrence of the first components from the current date backward and the second forward
let now = Date()
let startDate = Calendar.current.nextDate(after: now, matching: startComponents, matchingPolicy: .nextTime, direction: .backward)!
let endDate = Calendar.current.nextDate(after: startDate , matching: endComponents, matchingPolicy: .nextTime)!
and create a DateInterval and check if the current date is in the range
let isInRange = DateInterval(start: startDate, end: endDate).contains(now)
extension Date {
func isSameWeek(as date: Date) -> Bool {
let dateComponents = Calendar.current.dateComponents([.day, .weekOfYear, .year], from: date)
let currentDateComponents = Calendar.current.dateComponents([.day, .weekOfYear, .year], from: self)
return dateComponents.year == currentDateComponents.year && dateComponents.weekOfYear == currentDateComponents.weekOfYear
}
}
you can try this extension:-
extension Date{
func timeAgoDisplay() -> String {
let secondsAgo = Int(Date().timeIntervalSince(self))
let minute = 60
let hour = minute * 60
let day = hour * 24
let week = day * 7
let month = week * 4
if secondsAgo < 60 {
return "\(secondsAgo) seconds ago"
}else if secondsAgo < hour {
return "\(secondsAgo/minute) minutes ago"
}else if secondsAgo < day {
return "\(secondsAgo/hour) hours ago"
}else if secondsAgo < week {
return "\(secondsAgo/day) days ago"
}else if secondsAgo < month {
return "\(secondsAgo/week) weeks ago"
}else {
return "\(secondsAgo/month) month(s) ago"
}
}
}
I am trying to make a counter that count day 1 from each month and reset it self for next month when it reaches that specific day.
Here's my code:
let date = NSDate()
let calendar = Calendar.current
let currentDate = calendar.date(from: components)
let userCalendar = Calendar.current
// here we set the due date. When the timer is supposed to finish
let competitionDate = NSDateComponents()
competitionDate.year = components.year!
competitionDate.month = components.month!
competitionDate.day = 9
competitionDate.hour = 00
competitionDate.minute = 00
let competitionDay = userCalendar.date(from: competitionDate as DateComponents)!
//here we change the seconds to hours,minutes and days
let CompetitionDayDifference = calendar.dateComponents([.day, .hour, .minute], from: Date().startOfMonth(), to: competitionDay)
//finally, here we set the variable to our remaining time
let daysLeft = CompetitionDayDifference.day
let hoursLeft = CompetitionDayDifference.hour
let minutesLeft = CompetitionDayDifference.minute
print(daysLef)
counter.value = CGFloat(daysLeft!)
The problem with this code is when it reaches day 0 it never reset it self back to count from current date to next month day # 9
You should use Calendar method func nextDate(after date: Date, matching components: DateComponents, matchingPolicy: Calendar.MatchingPolicy, repeatedTimePolicy: Calendar.RepeatedTimePolicy = default, direction: Calendar.SearchDirection = default) -> Date?, pass the day date component to it, use matchingPolicy .strict, repeatedTimePolicy .first and direction .forward to find the next date occurrence. Then you just need to use Calendar method func dateComponents(_ components: Set<Calendar.Component>, from start: Date, to end: Date) -> DateComponents and pass the date components that you want returned (day, hour, minute):
extension Date {
func timeLeftUntil(day: Int) -> (day: Int, hour: Int, minute: Int) {
precondition(1...28 ~= day, "paycheck day \(day) is out of range 1...28")
let nextDate = Calendar.current.nextDate(after: self, matching: DateComponents(day: day), matchingPolicy: .strict, repeatedTimePolicy: .first, direction: .forward)!
let dateComponents = Calendar.current.dateComponents([.day,.hour,.minute], from: self, to: nextDate)
return (dateComponents.day!, dateComponents.hour!, dateComponents.minute!)
}
}
Usage:
Date().timeLeftUntil(day: 25) // (day 23, hour 0, minute 39)
I have an app in which I want to show some data when it's Saturday or Sunday.
Actually I have a segmented control and if I press one of my option (which will be the weekend) I want to check If it is Saturday or Sunday but only the first weekend.
This is what I've done for my first option in segmented control to take the current date
dateevent is a variable that I take to check if is the currentDate
currentDate is declared to be the currentDate
if dateevent.earlierDate(self.currentDate).isEqualToDate(self.currentDate){
if NSCalendar.currentCalendar().isDate(dateevent, equalToDate: self.currentDate, toUnitGranularity: .Day){
//Do something
}
}
First find the number of days to add to NSDateComponents weekday property and then You can use dateByAddingComponents(_:toDate:options:).
let today = NSDate()
let calendar = NSCalendar.currentCalendar()
let todayWeekday = calendar.component(.Weekday, fromDate: today)
let addWeekdays = 7 - todayWeekday // 7: Saturday number
var components = NSDateComponents()
components.weekday = addWeekdays
let nextSaturday = calendar.dateByAddingComponents(components, toDate: today, options: .MatchFirst)
From the Apple docs:
If the date does fall within a weekend, you can use the
rangeOfWeekendStartDate:interval:containingDate: method to determine
the start date of that weekend period. Otherwise, you can use the
nextWeekendStartDate:interval:options:afterDate: method to determine
the start date of the next or previous weekend.
extension for getting day of the week
func dayOfTheWeek() -> String? {
let dateFormatter = NSDateFormatter()
dateFormatter.locale = NSLocale(localeIdentifier: "en_US")
dateFormatter.dateFormat = "EEEE"
return dateFormatter.stringFromDate(self)
}
then you can just count how many days do yo need to weekend and add it to NSDate
NSDate().dateByAddingTimeInterval(60 * 60 * 24 * daysFromTodayToWeekend)
Swift 4 Solution
I have figured out according to my requirement, where I have find out dates for following.
1. Today
2. Tomorrow
3. This Week
4. This Weekend
5. Next Week
6. Next Weekend
So, I have created Date Extension to get Dates of Current Week and Next Week.
CODE
extension Date {
func getWeekDates() -> (thisWeek:[Date],nextWeek:[Date]) {
var tuple: (thisWeek:[Date],nextWeek:[Date])
var arrThisWeek: [Date] = []
for i in 0..<7 {
arrThisWeek.append(Calendar.current.date(byAdding: .day, value: i, to: startOfWeek)!)
}
var arrNextWeek: [Date] = []
for i in 1...7 {
arrNextWeek.append(Calendar.current.date(byAdding: .day, value: i, to: arrThisWeek.last!)!)
}
tuple = (thisWeek: arrThisWeek,nextWeek: arrNextWeek)
return tuple
}
var tomorrow: Date {
return Calendar.current.date(byAdding: .day, value: 1, to: noon)!
}
var noon: Date {
return Calendar.current.date(bySettingHour: 12, minute: 0, second: 0, of: self)!
}
var startOfWeek: Date {
let gregorian = Calendar(identifier: .gregorian)
let sunday = gregorian.date(from: gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))
return gregorian.date(byAdding: .day, value: 1, to: sunday!)!
}
func toDate(format: String) -> String {
let formatter = DateFormatter()
formatter.dateFormat = format
return formatter.string(from: self)
}
}
USAGE:
let arrWeekDates = Date().getWeekDates() // Get dates of Current and Next week.
let dateFormat = "MMM dd" // Date format
let thisMon = arrWeekDates.thisWeek.first!.toDate(format: dateFormat)
let thisSat = arrWeekDates.thisWeek[arrWeekDates.thisWeek.count - 2].toDate(format: dateFormat)
let thisSun = arrWeekDates.thisWeek[arrWeekDates.thisWeek.count - 1].toDate(format: dateFormat)
let nextMon = arrWeekDates.nextWeek.first!.toDate(format: dateFormat)
let nextSat = arrWeekDates.nextWeek[arrWeekDates.nextWeek.count - 2].toDate(format: dateFormat)
let nextSun = arrWeekDates.nextWeek[arrWeekDates.nextWeek.count - 1].toDate(format: dateFormat)
print("Today: \(Date().toDate(format: dateFormat))") // Sep 26
print("Tomorrow: \(Date().tomorrow.toDate(format: dateFormat))") // Sep 27
print("This Week: \(thisMon) - \(thisSun)") // Sep 24 - Sep 30
print("This Weekend: \(thisSat) - \(thisSun)") // Sep 29 - Sep 30
print("Next Week: \(nextMon) - \(nextSun)") // Oct 01 - Oct 07
print("Next Weekend: \(nextSat) - \(nextSun)") // Oct 06 - Oct 07
You can modify Extension according to your need.
Thanks!
I use this implementation to get the next Saturday at specific time:
CODE (Swift 5):
func nextSaturday(atHour hour: Int, min: Int) -> Date {
let today = Date()
let daysToAdd = 7 - (Calendar.current.dateComponents([.weekday], from: today).weekday ?? 0 )
let nextSaturday = Calendar.current.date(byAdding: .day, value: daysToAdd, to: today)!
return Calendar.current.date(bySettingHour: hour, minute: min, second: 0, of: nextSaturday)!
}
How to use it:
nextSaturday(atHour: 10, min: 0)
To find the start and end for the current week I managed to do this:
extension NSDate {
static func week() -> (NSDate, NSDate) {
let calendar = NSCalendar.currentCalendar()
calendar.firstWeekday = 2
var interval = NSTimeInterval(0)
var startOfWeek: NSDate?
var endOfWeek: NSDate!
calendar.rangeOfUnit(.WeekOfMonth, startDate: &startOfWeek, interval: &interval, forDate: NSDate())
endOfWeek = startOfWeek?.dateByAddingTimeInterval(interval - 1)
return (startOfWeek!, endOfWeek)
}
}
How can I update this code to get the start/end of the previous week ?
// Getting first day of the previous week
func getPreviousWeekStartDay() -> Date? {
let gregorian = Calendar(identifier: .gregorian)
let sunday = gregorian.date(from:
gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))
return gregorian.date(byAdding: .day, value: -7, to: sunday!)!
}
// Getting last day of previous week
func getPreviousWeekEndDay() -> Date? {
let gregorian = Calendar(identifier: .gregorian)
let sunday = gregorian.date(from: gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self))
return gregorian.date(byAdding: .day, value: -1, to: sunday!)!
}
You can start counting from a week ago:
let weekInSeconds: Double = 60 * 60 * 24 * 7
calendar.rangeOfUnit(.WeekOfMonth, startDate: &startOfWeek, interval: &interval, forDate: NSDate(timeIntervalSinceNow: -weekInSeconds))
You can now control which week (from now) you want to see, in the past of future, by using multiples of weekInSeconds (positive for future weeks, negative for past weeks, 0 for this week).
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)