How can I express hour and minute integer values as a String formatted like "9:30 am"?
Currently, I have:
let hour: Int = 9
let minute: Int = 30
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
let time: String = DateComponentsFormatter.localizedString(from: dateComponents, unitsStyle: DateComponentsFormatter.UnitsStyle.positional)
print(time) // Prints "9:30", not "9:30 am"
I know I can manually concatenate the time meridian at the end, but I'm hoping there's a built in function for this. Perhaps a different UnitsStyle?
You could use DateFormatter to achieve this.
let formatter = DateFormatter()
formatter.dateFormat = "hh:mm a"
formatter.amSymbol = "am"
formatter.pmSymbol = "pm"
let dateString = formatter.string(from: Date())
print(dateString) // prints "12:17 pm"
If you want to only include single digits for the hour, then you only include one "h" in the dateFormat:
formatter.dateFormat = "h:mm a" // prints "1:30 pm" instead of "01:30 pm"
let formatter = DateFormatter()
formatter.dateFormat = "hh:mm a"
formatter.calendar = .current
let hour: Int = 9
let minute: Int = 30
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
If let fixedDate: Date = Calendar.current.date(from: dateComponents) {
let formattedString = formatter.string(from: fixedDate)
print(formattedString) //prints 09:30 AM
}
You need to add current calendar/date to get am or pm from your time from what I know.
EDIT:
Thanks to Leo Dabus in the comments for pointing this out: the above method will result in a date that is on January 1st 0001, if the date is important for you you have to specify the date (day/month/year)
for example:
let date = Date()
let formatter = DateFormatter()
formatter.dateFormat = "hh:mm a"
formatter.calendar = .current
let hour: Int = 9
let minute: Int = 30
var dateComponents = DateComponents()
dateComponents.hour = hour
dateComponents.minute = minute
dateComponents.year = Calendar.current.component(.year, from: date)
dateComponents.month = Calendar.current.component(.month, from: date)
dateComponents.day = Calendar.current.component(.day, from: date)
If let fixedDate: Date = Calendar.current.date(from: dateComponents) {
let formattedString = formatter.string(from: fixedDate)
print(formattedString)
}
I have the following formatter:
let dateFormatter = DateFormatter()
dateFormatter.dateStyle = .medium
dateFormatter.timeStyle = .short
dateFormatter.doesRelativeDateFormatting = true
My goal is to turn my dates into strings like:
Today at 3pm
Tomorrow at 3pm
Sun Sep 27 at 3pm
It works great for dates that are today or tomorrow, but for dates beyond that I want the following format:
"Sun Sep 27 at 4pm"
When I print the result of dateFormatter.string(from: DATE) for a date 3 days from now, I get the following:
Sep 27, 2020 at 4 PM
Is there a way to customize the dateStyle so I can instead get the desired string? I messed around with .full, .short, etc. but want to customize it my way.
Here is a Locale-independent solution:
Check if the Date is relative:
For this you can use Calendar functions .isDateInYesterday(date:) etc.
private func isDateRelative(_ date: Date) -> Bool {
Calendar.current.isDateInYesterday(date)
|| Calendar.current.isDateInToday(date)
|| Calendar.current.isDateInTomorrow(date)
}
If it's relative replace the date part with the date in the localizedFormat but keep the time part intact.
DateFormatter extension
extension DateFormatter {
func relativeStringWithFormat(from date: Date, localizedFormat: String) -> String {
if isDateRelative(date) {
return relativeDateTimeString(from: date)
}
let dateStr = localizedDateString(from: date, localizedFormat: localizedFormat)
let timeStr = relativeTimeString(from: date)
return dateStr + timeStr
}
private func relativeDateTimeString(from date: Date) -> String {
dateStyle = .medium
timeStyle = .short
doesRelativeDateFormatting = true
return string(from: date)
}
private func relativeDateString(from date: Date) -> String {
dateStyle = .medium
timeStyle = .none
doesRelativeDateFormatting = true
return string(from: date)
}
private func relativeTimeString(from date: Date) -> String {
relativeDateTimeString(from: date).replacingOccurrences(of: relativeDateString(from: date), with: "")
}
private func localizedDateString(from date: Date, localizedFormat: String) -> String {
setLocalizedDateFormatFromTemplate(localizedFormat)
doesRelativeDateFormatting = false
return string(from: date)
}
private func isDateRelative(_ date: Date) -> Bool {
Calendar.current.isDateInYesterday(date)
|| Calendar.current.isDateInToday(date)
|| Calendar.current.isDateInTomorrow(date)
}
}
Testing
let dateFormatter = DateFormatter()
dateFormatter.locale = Locale(identifier: "en_US")
let today = Date()
let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: today)!
let nextWeek = Calendar.current.date(byAdding: .day, value: 7, to: today)!
let localizedFormat = "EEE d MMM"
print(dateFormatter.relativeStringWithFormat(from: today, localizedFormat: localizedFormat))
// Today at 6:20 PM
print(dateFormatter.relativeStringWithFormat(from: tomorrow, localizedFormat: localizedFormat))
// Tomorrow at 6:20 PM
print(dateFormatter.relativeStringWithFormat(from: nextWeek, localizedFormat: localizedFormat))
// Sat, Oct 3 at 6:20 PM
Try it like this:
dateformater.dateformat = "E, d MMM yyyy HH:mm:ss"
Output:
Wed, 12 Sep 2018 14:11:54
Here's a DateFormatter subclass that should give you what you want. Note that I handled the "Yesterday" case even though you didn't mention it in your question. Also note the if you want to display times other than just the hour portion you'll need to adjust the "ha" part of the dateFormat string.
class MyDateFormatter: DateFormatter {
override init() {
super.init()
amSymbol = "am"
pmSymbol = "pm"
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func string(from date: Date) -> String {
setDateFormat(forDate: date)
return super.string(from: date)
}
private func setDateFormat(forDate date: Date) {
if calendar.isDateInYesterday(date) {
dateFormat = "'Yesterday' 'at' ha"
return
} else if calendar.isDateInToday(date) {
dateFormat = "'Today' 'at' ha"
return
} else if calendar.isDateInTomorrow(date) {
dateFormat = "'Tomorrow' 'at' ha"
return
}
dateFormat = "E MMM d 'at' ha"
}
}
Just use it as you would a normal DateFormatter:
let formatter = MyDateFormatter()
let dateStr = formatter.string(from: Date())
print(dateStr) // Today at 12pm
The quickest way to get what you want would just be
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEEE MMM d 'at' ha"
If you want to ensure the AM and PM are lowercased, you could add
dateFormatter.amSymbol = "am"
dateFormatter.pmSymbol = "pm"
I'm using swift in my project and I want to show specific date like this: 5 days ago or 5 month ago or ...
I am using DateComponentsFormatter and it's doing well, but the problem is I want to show 1 day ago like "Yesterday" or showing 3 second ago like "Today". how can I do this? can I use DateComponentsFormatter for this problem? this is my codes:
func shortDate(_ local: LocaleIdentifier = .fa) -> String {
let now = Date()
let date = self
let formatter = DateComponentsFormatter()
formatter.calendar?.locale = Locale(identifier: local.rawValue)
formatter.unitsStyle = .full
formatter.maximumUnitCount = 1
formatter.allowedUnits = [.year, .month, .day, .hour, .minute, .second]
guard let timeString = formatter.string(from: date, to: now) else {
return ""
}
return String(format: "Ago".localized, timeString)
}
For iOS 13 or later you can use RelativeDateTimeFormatter
let relativeDateTimeFormatter = RelativeDateTimeFormatter()
relativeDateTimeFormatter.dateTimeStyle = .named
relativeDateTimeFormatter.unitsStyle = .full
let date = Date.init(timeIntervalSinceNow: -60*60*24)
relativeDateTimeFormatter.string(for: date) // "yesterday"
edit/update:
If you would like to support iOS 11 you would need to implement your own relative date formatter. You can use Calendar method isDateInToday and isDateInYesterday to combine a relative date formatter with date components formatter. Note that there is no need to check the time interval for setting a single unit in your date components formatter you can set the allowed units of your date components formatter, just make sure you set them respecting the desired priority to be displayed:
// This will avoid creating a formatter every time you call relativeDateFormatted property
extension Formatter {
static let dateComponents: DateComponentsFormatter = {
let dateComponentsFormatter = DateComponentsFormatter()
dateComponentsFormatter.allowedUnits = [.day, .month, .year] // check the order of the units it does matter when allowing only 1 unit to be displayed
dateComponentsFormatter.maximumUnitCount = 1
dateComponentsFormatter.unitsStyle = .full
return dateComponentsFormatter
}()
static let relativeDate: DateFormatter = {
let dateFormatter = DateFormatter()
dateFormatter.doesRelativeDateFormatting = true
dateFormatter.timeStyle = .none
dateFormatter.dateStyle = .medium
return dateFormatter
}()
}
extension Date {
var relativeDateFormatted: String {
Calendar.current.isDateInToday(self) || Calendar.current.isDateInYesterday(self) ?
Formatter.relativeDate.string(from: self) :
Formatter.dateComponents.string(from: self, to: Date()) ?? ""
}
}
Playground testing:
let date1 = DateComponents(calendar: .current, year: 2020, month: 9, day: 4, hour: 5).date!
let date2 = DateComponents(calendar: .current, year: 2020, month: 9, day: 3, hour: 23, minute: 50).date!
let date3 = DateComponents(calendar: .current, year: 2020, month: 8, day: 25, hour: 10).date!
let date4 = DateComponents(calendar: .current, year: 2020, month: 8, day: 3).date!
let date5 = DateComponents(calendar: .current, year: 2019, month: 8, day: 27).date!
date1.relativeDateFormatted // "Today"
date2.relativeDateFormatted // "Yesterday"
date3.relativeDateFormatted // "10 days"
date4.relativeDateFormatted // "1 month"
date5.relativeDateFormatted // "1 year"
You are looking for the doesRelativeDateFormatting property of a DateFormatter.
I think, I must use both DateComponentsFormatter for more than 1 day and DateFormatter for showing Today(day=0) and Yesterday(day=1) for my problem.
I found my answer here.
but I make codes a little better, this is my codes:
var calendar = Calendar.current
calendar.locale = Locale(identifier: local.rawValue)
let componentFormatter = DateComponentsFormatter()
componentFormatter.calendar = calendar
componentFormatter.unitsStyle = .full
componentFormatter.maximumUnitCount = 1
let interval = Calendar.current.dateComponents([.year, .month, .day], from: self, to: Date())
if let year = interval.year, year > 0 {
componentFormatter.allowedUnits = .year
} else if let month = interval.month, month > 0 {
componentFormatter.allowedUnits = .month
} else if let day = interval.day, day > 1 {
componentFormatter.allowedUnits = .day
} else { // if let day = interval.day, day == 0 || day == 1 for Today or Yesterday
let formatter = DateFormatter()
formatter.doesRelativeDateFormatting = true
formatter.calendar.locale = Locale(identifier: local.rawValue)
formatter.timeStyle = .none
formatter.dateStyle = .medium
return formatter.string(from: self)
}
guard let timeString = componentFormatter.string(from: self, to: Date()) else {
return ""
}
return String(format: "Ago".localized, timeString)
how to convert a string hour to millisecond of the day?
for exemple:
let strDate = "06:00 PM"
Or:
let strDate = "09:00 AM"
my code:
let dateString = "06:00 PM"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
guard let date = dateFormatter.date(from: dateString)
else { fatalError() }
print(date)
for example my string is: 06:00 PM, so I want to have the date in millisecond of today Thursday 20 September 2018 at 06:00 PM
You can set your DateFormatter default date to startOfDay for today, set the formatter locale locale to "en_US_POSIX" when parsing your time then you can simply get your resulting date timeIntervalSince1970 and multiply by 1000:
let strTime = "06:00 PM"
let formatter = DateFormatter()
formatter.defaultDate = Calendar.current.startOfDay(for: Date())
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "hh:mm a"
if let date = formatter.date(from: strTime) {
let milliseconds = date.timeIntervalSince1970 * 1000
print(milliseconds) // 1537477200000
let date2 = Date(timeIntervalSince1970: milliseconds/1000)
print(date2.description(with: .current)) // Thursday, September 20, 2018 at 6:00:00 PM Brasilia Standard Time
}
First, you need to parse the date string:
let dateString = "06:00 PM"
let formatter = DateFormatter()
formatter.defaultDate = Date()
formatter.dateFormat = "hh:mm a"
formatter.locale = Locale(identifier: "en_US_POSIX")
let date = formatter.date(from: dateString)
Then, you need to get the start of day:
let calendar = Calendar.current
let start = calendar.startOfDay(for: date)
After that, get the time interval between date and start:
let timeInterval = date.timeIntervalSince(start)
let milliseconds = timeInterval * 1000.0
I'm trying to get Monday's date of the current week. This is treated as the first day of the week in my table view.
I also need to get Sunday's of the current week. This is treated as the last day of the week in my table view.
Current attempt:
let date = NSDate()
let calendar = NSCalendar.currentCalendar()
calendar.firstWeekday = 1
//attempt to changefirstday
let dateFormatter = NSDateFormatter()
let theDateFormat = NSDateFormatterStyle.ShortStyle
let theTimeFormat = NSDateFormatterStyle.ShortStyle
dateFormatter.dateStyle = theDateFormat
dateFormatter.timeStyle = theTimeFormat
let currentDateComponents = calendar.components([.YearForWeekOfYear, .WeekOfYear ], fromDate: date)
let startOfWeek = calendar.dateFromComponents(currentDateComponents)
print("startOfWeek is \(startOfWeek)")
let stringDate = dateFormatter.stringFromDate(startOfWeek!)
print("string date is \(stringDate)") //This is returning Sunday's date
I wrote Date extensions to get Date for certain weekday and here is how easy it is to use with Swift 5,
Date.today() // Oct 15, 2019 at 9:21 AM
Date.today().next(.monday) // Oct 21, 2019 at 9:21 AM
Date.today().next(.sunday) // Oct 20, 2019 at 9:21 AM
Date.today().previous(.sunday) // Oct 13, 2019 at 9:21 AM
Date.today().previous(.monday) // Oct 14, 2019 at 9:21 AM
Date.today().previous(.thursday) // Oct 10, 2019 at 9:21 AM
Date.today().next(.thursday) // Oct 17, 2019 at 9:21 AM
Date.today().previous(.thursday,
considerToday: true) // Oct 10, 2019 at 9:21 AM
Date.today().next(.monday)
.next(.sunday)
.next(.thursday) // Oct 31, 2019 at 9:21 AM
And here is Date extension for that,
extension Date {
static func today() -> Date {
return Date()
}
func next(_ weekday: Weekday, considerToday: Bool = false) -> Date {
return get(.next,
weekday,
considerToday: considerToday)
}
func previous(_ weekday: Weekday, considerToday: Bool = false) -> Date {
return get(.previous,
weekday,
considerToday: considerToday)
}
func get(_ direction: SearchDirection,
_ weekDay: Weekday,
considerToday consider: Bool = false) -> Date {
let dayName = weekDay.rawValue
let weekdaysName = getWeekDaysInEnglish().map { $0.lowercased() }
assert(weekdaysName.contains(dayName), "weekday symbol should be in form \(weekdaysName)")
let searchWeekdayIndex = weekdaysName.firstIndex(of: dayName)! + 1
let calendar = Calendar(identifier: .gregorian)
if consider && calendar.component(.weekday, from: self) == searchWeekdayIndex {
return self
}
var nextDateComponent = calendar.dateComponents([.hour, .minute, .second], from: self)
nextDateComponent.weekday = searchWeekdayIndex
let date = calendar.nextDate(after: self,
matching: nextDateComponent,
matchingPolicy: .nextTime,
direction: direction.calendarSearchDirection)
return date!
}
}
// MARK: Helper methods
extension Date {
func getWeekDaysInEnglish() -> [String] {
var calendar = Calendar(identifier: .gregorian)
calendar.locale = Locale(identifier: "en_US_POSIX")
return calendar.weekdaySymbols
}
enum Weekday: String {
case monday, tuesday, wednesday, thursday, friday, saturday, sunday
}
enum SearchDirection {
case next
case previous
var calendarSearchDirection: Calendar.SearchDirection {
switch self {
case .next:
return .forward
case .previous:
return .backward
}
}
}
}
You can use calendar ISO8601 where the first weekday is Monday:
Swift 5.2 or later
extension Calendar {
static let iso8601 = Calendar(identifier: .iso8601)
static let iso8601UTC: Calendar = {
var calendar = Calendar(identifier: .iso8601)
calendar.timeZone = TimeZone(identifier: "UTC")!
return calendar
}()
}
let monday =
Calendar.iso8601.dateComponents([.calendar, .yearForWeekOfYear, .weekOfYear], from: Date()).date! // "Nov 9, 2020 at 12:00 AM"
print(monday.description(with: .current)) // "Monday, November 9, 2020 at 12:00:00 AM Brasilia Standard Time\n"
let mondayUTC =
Calendar.iso8601UTC.dateComponents([.calendar, .yearForWeekOfYear, .weekOfYear], from: Date()).date! // "Nov 8, 2020 at 9:00 PM" TimeZone -03:00
print(mondayUTC) // "2020-11-09 00:00:00 +0000\n"
Implemented as a Date computer property extension:
extension Date {
var mondayOfTheSameWeek: Date {
Calendar.iso8601.dateComponents([.calendar, .yearForWeekOfYear, .weekOfYear], from: self).date!
}
var mondayOfTheSameWeekAtUTC: Date {
Calendar.iso8601UTC.dateComponents([.calendar, .yearForWeekOfYear, .weekOfYear], from: self).date!
}
}
let mondayOfTheSameWeek = Date().mondayOfTheSameWeek // "Nov 9, 2020 at 12:00 AM"
print(mondayOfTheSameWeek.description(with: .current)) // "Monday, November 9, 2020 at 12:00:00 AM Brasilia Standard Time\n"
let mondayOfTheSameWeekAtUTC = Date().mondayOfTheSameWeekAtUTC // "Nov 8, 2020 at 9:00 PM"
print(mondayOfTheSameWeekAtUTC) // "2020-11-09 00:00:00 +0000\n"
Here's a simplified version of Sandeep's answer.
Usage:
Date().next(.monday)
Date().next(.monday, considerToday: true)
Date().next(.monday, direction: .backward)
Extension:
public func next(_ weekday: Weekday,
direction: Calendar.SearchDirection = .forward,
considerToday: Bool = false) -> Date
{
let calendar = Calendar(identifier: .gregorian)
let components = DateComponents(weekday: weekday.rawValue)
if considerToday &&
calendar.component(.weekday, from: self) == weekday.rawValue
{
return self
}
return calendar.nextDate(after: self,
matching: components,
matchingPolicy: .nextTime,
direction: direction)!
}
public enum Weekday: Int {
case sunday = 1, monday, tuesday, wednesday, thursday, friday, saturday
}
Here is the extension I created, first it finds sunday and then it adds one day
extension Date {
var startOfWeek: Date? {
let gregorian = Calendar(identifier: .gregorian)
guard let sunday = gregorian.date(from: gregorian.dateComponents([.yearForWeekOfYear, .weekOfYear], from: self)) else { return nil }
return gregorian.date(byAdding: .day, value: 1, to: sunday)
}
}
Try to use:
calendar.firstWeekday = 2
Edit
To be more specific: NSCalendar.currentCalendar() returns user calendar. According to docs:
The returned calendar is formed from the settings for the current user’s chosen system locale overlaid with any custom settings the user has specified in System Preferences.
If you want always Monday as first day, I think you should use:
let calendar = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)!
calendar!.firstWeekday = 2
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!
Addition to #Saneep answer
If you would like to get exact dateTime as per given/current date (lets say you wanted to convert Monday's dateTime -> 23-05-2016 12:00:00 to 23-05-2016 05:35:17) then try this:
func convertDate(date: NSDate, toGivendate: NSDate) -> NSDate {
let calendar = NSCalendar.currentCalendar()
let comp = calendar.components([.Year, .Month, .Day, .Hour, .Minute, .Second], fromDate: toGivendate)
let hour = comp.hour
let minute = comp.minute
let second = comp.second
let dateComp = calendar.components([.Year, .Month, .Day], fromDate: date)
let year = dateComp.year
let month = dateComp.month
let day = dateComp.day
let components = NSDateComponents()
components.year = year
components.month = month
components.day = day
components.hour = hour
components.minute = minute
components.second = second
let newConvertedDate = calendar.dateFromComponents(components)
return newConvertedDate!
}
simple code (remember to take better care of the optionals):
let now = Date()
var calendar = Calendar(identifier: .gregorian)
let timeZone = TimeZone(identifier: "UTC")!
let desiredWeekDay = 2
let weekDay = calendar.component(.weekday, from: now)
var weekDayDate = calendar.date(bySetting: .weekday, value: desiredWeekDay, of: now)!
/// Swift will give back the closest day matching the value above so we need to manipulate it to be always included at cuurent week.
if weekDayDate > now, weekDay > desiredWeekDay {
weekDayDate = weekDayDate - 7*24*60*60
}
print(weekDayDate)