iOS Swift Converting Calendar Component Int Month to Medium Style String Month

How can I get the current month as String?

let now = Date()
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "LLLL"
let nameOfMonth = dateFormatter.string(from: now)

get every name of month components in swift

The DateFormatter class has what you need:

let formatter = DateFormatter()
let monthComponents = formatter.shortMonthSymbols

See the docs for DateFormatter to see all of the other related methods for getting other various symbols.

Or as of iOS 10/macOS 10.12 you can use Calendar:

let monthComponents = Calendar.current.shortMonthSymbols

Populate objects in TableView sections by months order

Create a wrapper struct

struct Section {
    let month : String
    let birthdays : [Birthday]
}

then map the grouped dictionary to an array of Section

let keys = Array(grouped.keys)
let sections = keys.map({Section(month: $0, birthdays: grouped[$0]!)})

sections represent the sections, birthdays the rows, month the section header titles.

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Edit:

To be able to sort the months by their ordinal number return the number in front of the month name

grouped = Dictionary(grouping: birthdaysList) { item -> String in
    let calendar = Calendar.current
    let components = calendar.dateComponents([.year, .month], from: item.date)
    let date = calendar.date(from: components) ?? Date(timeIntervalSince1970: 0)
    return  "\(components.month!)_" + date.monthAsString()
}

And modify the mapping code

let keys = grouped.keys.sorted{$0.localizedStandardCompare($1) == .orderedAscending}
let sections = keys.map({Section(month: $0.components(separatedBy:"_").last!, birthdays: grouped[$0]!)})

Create date by components in swift

Try adding "GMT" timezone, such as:

 dateComponents.timeZone = TimeZone(identifier: "GMT")

How to get DatePicker time to Calendar component and insert to Label component in Swift

I think you want something like this:

@IBAction func datePickerChanged(_ sender: UIDatePicker) {

    var pickerDate = sender.date

    let calendar = Calendar.current
    guard let endDate = calendar.date(byAdding: .hour, value: 8, to: pickerDate) else { return }

    let dateFormatter = DateFormatter()
    dateFormatter.timeStyle = DateFormatter.Style.short //show time in h:mm format
    dateFormatter.locale = Locale(identifier: "de-DE") //locale Germany
    var endTimeString = dateFormatter.string(from: endDate) //convert time from date to String
    dateLabel.text = endTimeString // show calculated time in UILabel

}

First, you need to get the selected date from the UIDatePicker.
Then, for date calulations, you need to specify a calendar to work with. Typically the current calendar is what you want (this is the calendar specified for the device). Then, add 8 hours and convert it to a string.

Btw.: you need to keep in mind that when the user picks a date in the evening, there is a "day flip" when you add 8 hours.

Update

To add somthing like 8 hours and 13 minutes, it's best to use DateComponents:

var now = Date()
var calendar = Calendar.current
var addComp = DateComponents(calendar:calendar,
                             hour:8,
                             minute:13)

if let then = calendar.date(byAdding: addComp, to: now, wrappingComponents:false) {
    print(now)
    print(then!)
}

Swift - New Update gives optional issues

You need to unwrap the variables with ! when you´re creating your timeString and dateString:

let timeString = "\(hour!):\(minutes!):\(seconds!)"
var dateString = "\(year!)/\(month!)/\(day!)"

print(timeString)
print(dateString)

Will print out:

6:0:25
2016/9/16

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