How to Print Name of The Day of The Week

How to print name of the day of the week?

You are using the wrong date format. The correct format is "yyyy-M-d". Besides that you can use Calendar property weekdaySymbols which returns the weekday localized.

func getDayOfWeek(_ date: String) -> String? {
    let formatter  = DateFormatter()
    formatter.dateFormat = "yyyy-M-d"
    formatter.locale = Locale(identifier: "en_US_POSIX")
    guard let todayDate = formatter.date(from: date) else { return nil }
    let weekday = Calendar(identifier: .gregorian).component(.weekday, from: todayDate)
    return Calendar.current.weekdaySymbols[weekday-1] // "Monday"
}

Another option is to use DateFormatter and set your dateFormat to "cccc" as you can see in this answer:

extension Formatter {
    static let weekdayName: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "cccc"
        return formatter
    }()
    static let customDate: DateFormatter = {
        let formatter  = DateFormatter()
        formatter.dateFormat = "yyyy-M-d"
        formatter.locale = Locale(identifier: "en_US_POSIX")
        return formatter
    }()
}
extension Date {
    var weekdayName: String { Formatter.weekdayName.string(from: self) }
}

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Using the extension above your function would look like this:

func getDayOfWeek(_ date: String) -> String? { Formatter.customDate.date(from: date)?.weekdayName }

Playground testing:

getDayOfWeek("2018-3-5")  // Monday
Date().weekdayName        // Thursday

Python print day name of week from number

In python, for statements like if, for, etc. You have to add : at the end of it.
And for comparing (for equal) you have to use == and not =

num = 4
if(num == 1):
    print('Monday')
elif num == 2:
    print('Tuesday')

.....

You can compare without parenthesis and it will work too.

How do I get the day of week given a date?

Use weekday():

>>> import datetime
>>> datetime.datetime.today()
datetime.datetime(2012, 3, 23, 23, 24, 55, 173504)
>>> datetime.datetime.today().weekday()
4

From the documentation:

Return the day of the week as an integer, where Monday is 0 and Sunday is 6.

How get the name of the days of the week in Dart

Use 'EEEE' as a date pattern

 DateFormat('EEEE').format(date); /// e.g Thursday

Don't forget to import

import 'package:intl/intl.dart';

Check this for more info : https://pub.dev/documentation/intl/latest/intl/DateFormat-class.html

How to determine day of week by passing specific date?

Yes. Depending on your exact case:

• You can use java.util.Calendar:

  Calendar c = Calendar.getInstance();
  c.setTime(yourDate);
  int dayOfWeek = c.get(Calendar.DAY_OF_WEEK);
  

• if you need the output to be Tue rather than 3 (Days of week are indexed starting at 1 for Sunday, see Calendar.SUNDAY), instead of going through a calendar, just reformat the string: new SimpleDateFormat("EE").format(date) (EE meaning "day of week, short version")

• if you have your input as string, rather than Date, you should use SimpleDateFormat to parse it: new SimpleDateFormat("dd/M/yyyy").parse(dateString)

• you can use joda-time's DateTime and call dateTime.dayOfWeek() and/or DateTimeFormat.

• edit: since Java 8 you can now use java.time package instead of joda-time

How to get day name from datetime

import datetime
now = datetime.datetime.now()
print(now.strftime("%A"))

See the Python docs for datetime.now, datetime.strftime and more on strftime.

How can I output the day of week with embedded ruby?

Say i have date = Time.now.to_date then date.strftime("%A") will print name for the day of the week and to have just the number for the day of the week write date.wday.

Copy from here

So Time.now.strftime("%A") and in your case

<h6>
  <%= Time.now.strftime("%A, %B %d. %Y") %>
</h6>

Easiest to test this is the rails c. To remove the leading zero on the %d use %-d instead.

Get Day name from Weekday int

It is more Pythonic to use the calendar module:

>>> import calendar
>>> list(calendar.day_name)
['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']

Or, you can use common day name abbreviations:

>>> list(calendar.day_abbr)
['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']

Then index as you wish:

>>> calendar.day_name[1]
'Tuesday'

(If Monday is not the first day of the week, use setfirstweekday to change it)

Using the calendar module has the advantage of being location aware:

>>> import locale
>>> locale.setlocale(locale.LC_ALL, 'de_DE')
'de_DE'
>>> list(calendar.day_name)
['Montag', 'Dienstag', 'Mittwoch', 'Donnerstag', 'Freitag', 'Samstag', 'Sonntag']

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