Develop Reference

Date conversion in js

Is there a shorter way of converting date e.g. "2021-08-19" to "19 Aug 2021" or i need to every time create a new Date object??
const date = "2021-08-19";
const day = new Date(date).getDate()
const month = new Date(date).toLocaleString("en-US", {month: "short",})
const year = new Date(date).getFullYear()
console.log(day, month, year);

You could use UK format with some options for the date.
const
options = { year: 'numeric', month: 'short', day: 'numeric' },
date = "2021-08-19";
console.log(new Date(date).toLocaleString("en-UK", options));

get the day of the date in text format

Returning a list from the backend. This list is the notifications list. I want to write the date of each element next to it. But I want to write only the day of this date as text. I want these days in abbreviated TR format.
For example;
Sal (TR) = Tue
const stringToDate = (stringDate) => { // stringDate: '16-05-2022'
const dateArray = stringDate.split('-');
return (new Date(dateArray[2], (dateArray[1] - 1).toString().padStart(2, '0'), dateArray[0].padStart(2, '0')));
};
const day = new Date(stringToDate(props.notification?.notificationList?.createdAt));
const notificationDay = day.toLocaleString('tr', { day: 'short' });
console.log(notificationDay);

Use weekday
const notificationDay = day.toLocaleString('tr', { weekday: 'short' });
console.log(notificationDay);

Get weekday list between two dates? JavaScript

How to get weekday list between two dates? I need javaScript function for that. (date-fns library function also is Ok)
as e example
getWeekDayList('2022-01-10', '2022-01-20');
function getWeekDayList(startDate, endDate){
//Output should be week days only
2022-01-10
2022-01-11
2022-01-12
2022-01-13
2022-01-14
2022-01-17
2022-01-18
2022-01-19
2022-01-20
}

You can use a for loop to loop through each date between the start and end date, then use Date.getDay to get the day of the week and ignore the dates that are not a weekday.
function getWeekDayList(startDate, endDate) {
let days = []
let end = new Date(endDate)
for (let start = new Date(startDate); start <= end; start.setDate(start.getDate() + 1)) {
let day = start.getDay();
if (day != 6 && day != 0) {
days.push(new Date(start));
}
}
return days;
}
const result = getWeekDayList('2022-01-10', '2022-01-20')
console.log(result.map(e => e.toLocaleString('en-US', {weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' })))

Show second Friday of the month - Javascript [duplicate]

This question already has answers here:
How do I format a date in JavaScript?
(68 answers)
Closed 2 years ago.
I'm working on making a webpage that displays the next date for the Food Pantry. It happens on the second Friday of the month. I grabbed this current code from this question and I think I was able to modifiy it to fit my needs. However, I would like it to display in a 'April, 10th' format instead of '04/10/2020'. I have an extremely basic grasp of Javascript so if you explain it like I'm five would be helpful.
Also, if the second Friday is the current day, it would be great if it could say Today.
Thank you!
Date.prototype.nextsecondFriday = function (){
// Load the month.
var target = new Date(this.getFullYear(), this.getMonth(), 1, 0, 0, 0);
var today = new Date();
// Check to see if the 1st is on a Friday.
var isFriday = (target.getDay() == 1);
// Jump ahead two weeks from the 1st, and move back the appropriate number of days to reach the preceding Friday.
// i.e. If the 1st is a Thursday, we would move back three days.
var targetDate = 12 - (target.getDay() - 1);
// Quick adjustment if the 1st is a Friday.
if (isFriday) targetDate -= 4;
// Move to the second Friday in the month.
target.setDate(targetDate);
// Second Friday is before today's date, so find the second Friday next month.
if (today > target) {
//return "<em>" + target.toLocaleDateString() + " is in the past...</em>";
target.setMonth(target.getMonth() + 1);
return target.nextsecondFriday();
}
// Format and return string date of second Friday.
return target.toLocaleDateString();
}
var secondFridayDateString = new Date().nextsecondFriday();
document.getElementById("dynamicdate").innerHTML = secondFridayDateString;
<p>Our next food pantry is <span id="dynamicdate">Second Friday</span>.</p>

The below code find the second friday for any Date()
Date.prototype.nextsecondFriday = function() {
// get second firday for given month and year
const secondFriday = (year, month) => {
// first day of the month
let date = new Date(year, month, 1);
let dayDifference = 5 - date.getDay();
// get second friday of the month
if (dayDifference < 0) {
date.setDate(date.getDate() + (14 + (-1 * dayDifference)));
} else if (dayDifference >= 0) {
date.setDate(date.getDate() + 7 + dayDifference);
}
return date;
};
// format date to "April 10th"
const formatDate = (date) => {
const months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
const month = months[date.getMonth()];
const day = date.getDate();
let suffix = 'th';
const j = day % 10,
k = day % 100;
if (j == 1 && k != 11) {
suffix = "st";
} else if (j == 2 && k != 12) {
suffix = "nd";
} else if (j == 3 && k != 13) {
suffix = "rd";
}
return `${month} ${day}${suffix}`;
};
let date = this;
let closestSecondSaturday;
do {
let secondFridayOfThisMonth = secondFriday(date.getFullYear(), date.getMonth());
if (secondFridayOfThisMonth.getDate() === date.getDate()) {
closestSecondSaturday = "Today";
} else if (secondFridayOfThisMonth.getDate() >= date.getDate()) {
closestSecondSaturday = formatDate(secondFridayOfThisMonth);
} else {
// if current date has crossed the second friday, move to the next month
date.setMonth(date.getMonth() + 1);
}
} while (!closestSecondSaturday)
return closestSecondSaturday;
};
// sample call
document.write(new Date().nextsecondFriday());

Try new Intl.DateTimeFormat('en-US', options).format(target)
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat
Date.prototype.nextsecondFriday = function (){
// Load the month.
var target = new Date(this.getFullYear(), this.getMonth(), 1, 0, 0, 0);
var today = new Date();
// Check to see if the 1st is on a Friday.
var isFriday = (target.getDay() == 1);
// Jump ahead two weeks from the 1st, and move back the appropriate number of days to reach the preceding Friday.
// i.e. If the 1st is a Thursday, we would move back three days.
var targetDate = 12 - (target.getDay() - 1);
// Quick adjustment if the 1st is a Friday.
if (isFriday) targetDate -= 4;
// Move to the second Friday in the month.
target.setDate(targetDate);
// Second Friday is before today's date, so find the second Friday next month.
if (today > target) {
//return "<em>" + target.toLocaleDateString() + " is in the past...</em>";
target.setMonth(target.getMonth() + 1);
return target.nextsecondFriday();
}
let options = { year: 'numeric', month: 'long', day: 'numeric' };
// Format and return string date of second Friday.
return new Intl.DateTimeFormat('en-US', options).format(target);
}
var secondFridayDateString = new Date().nextsecondFriday();
document.getElementById("dynamicdate").innerHTML = secondFridayDateString;
<p>Our next food pantry is <span id="dynamicdate">Second Friday</span>.</p>

I would modify the nextsecondFriday function to return the date object instead of a formatted string (just drop the toLocaleDateString() call).
Then write another function formatDate which receives a date and returns a formatted string.
Then call nextsecondFriday to get the date and format it usingformatDate.
The code for formatting (the formatDate function), if you require that specific format (the colon and the 'th' etc), would probably be something like:
const event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
const monthOptions = { month: 'long' };
const dayOptions = { day: 'numeric' };
const formattedDate = event.toLocaleDateString('en-US', monthOptions) + ', ' + event.toLocaleDateString('en-US', dayOptions));
// then check event.getDay() and append 'st', 'nd', 'rd' or 'th' to formattedDate as needed
But if you can go with another format then just a single call to toLocaleDateString could be enough - check toLocaleDateString documentation on MDN for details.

See toDateString
you just have to change this statement
return target.toDateString();

options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
secondFridayDateString.toLocaleDateString("en-us", options)
you need to set the format, check that.
you can play with this in the console just doing:
let date = new Date()
options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
date.toLocaleDateString("en-us", options) //set your locale as you want i.e. es-ar or any locale

Day Name from Date in JS

I need to display the name of the day given a date (like "05/23/2014") which I get from a 3rd party.
I've tried using Date, but I only get the date.
What is the correct way to get the name of the day?

Use the methods provided by the standard JavaScript Date class:
Getting the day name from a date:
function getDayName(dateStr, locale)
{
var date = new Date(dateStr);
return date.toLocaleDateString(locale, { weekday: 'long' });
}
var dateStr = '05/23/2014';
var day = getDayName(dateStr, "nl-NL"); // Gives back 'Vrijdag' which is Dutch for Friday.
Getting all weekdays in an array:
function getWeekDays(locale)
{
var baseDate = new Date(Date.UTC(2017, 0, 2)); // just a Monday
var weekDays = [];
for(i = 0; i < 7; i++)
{
weekDays.push(baseDate.toLocaleDateString(locale, { weekday: 'long' }));
baseDate.setDate(baseDate.getDate() + 1);
}
return weekDays;
}
var weekDays = getWeekDays('nl-NL'); // Gives back { 'maandag', 'dinsdag', 'woensdag', 'donderdag', 'vrijdag', 'zaterdag', 'zondag'} which are the days of the week in Dutch.
For American dates use 'en-US' as locale.

You could use the Date.getDay() method, which returns 0 for sunday, up to 6 for saturday. So, you could simply create an array with the name for the day names:
var days = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
var d = new Date(dateString);
var dayName = days[d.getDay()];
Here dateString is the string you received from the third party API.
Alternatively, if you want the first 3 letters of the day name, you could use the Date object's built-in toString method:
var d = new Date(dateString);
var dayName = d.toString().split(' ')[0];
That will take the first word in the d.toString() output, which will be the 3-letter day name.

use the Date.toLocaleString() method :
new Date(dateString).toLocaleString('en-us', {weekday:'long'})

let weekday = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'][new Date().getDay()]

var days = [
"Sunday",
"Monday",
"...", //etc
"Saturday"
];
console.log(days[new Date().getDay()]);
Simple, read the Date object in JavaScript manual
To do other things with date, like get a readable string from it, I use:
var d = new Date();
d.toLocaleString();
If you just want time or date use:
d.toLocaleTimeString();
d.toLocaleDateString();
You can parse dates either by doing:
var d = new Date(dateToParse);
or
var d = Date.parse(dateToParse);

To get the day from any given date, just pass the date into a new Date object:
let date = new Date("01/05/2020");
let day = date.toLocaleString('en-us', {weekday: 'long'});
console.log(day);
// expected result = tuesday
To read more, go to mdn-date.prototype.toLocaleString()(https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toLocaleString)

let weekday = new Date(dateString).toLocaleString('en-us', {weekday:'long'});
console.log('Weekday',weekday);

Take a look at this :
var event = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
console.log(event.toLocaleDateString('de-DE', options));
// expected output: Donnerstag, 20. Dezember 2012
console.log(event.toLocaleDateString('ar-EG', options));
// expected output: الخميس، ٢٠ ديسمبر، ٢٠١٢
console.log(event.toLocaleDateString('ko-KR', options));
// expected output: 2012년 12월 20일 목요일
Source : Mozilla Doc

One line solution :
const day = ["sunday","monday","tuesday","wednesday","thursday","friday","saturday"][new Date().getDay()]

Easiest and simplest way:
var days = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];
var dayName = days[new Date().getDay()];

var dayName =['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];
var day = dayName[new Date().getDay()];
console.log(day)

One more option is to use the inbuilt function Intl.DateTimeFormat, e.g.:
const getDayName = (dateString) =>
new Intl.DateTimeFormat('en-Us', { weekday: 'long' }).format(new Date(dateString));
<label for="inp">Enter a date string in the format "MM/DD/YYYY" or "YYYY-MM-DD" and press "OK":</label><br>
<input type="text" id="inp" value="01/31/2021">
<button onclick="alert(getDayName(document.getElementById('inp').value))">OK</button>

Try using this code:
var event = new Date();
var options = { weekday: 'long' };
console.log(event.toLocaleDateString('en-US', options));
this will give you the day name in string format.

I'm not a fan of over-complicated solutions if anyone else comes up with something better, please let us know :)
any-name.js
var today = new Date().toLocaleDateString(undefined, {
day: '2-digit',
month: '2-digit',
year: 'numeric',
weekday: 'long'
});
any-name.html
<script>
document.write(today);
</script>

Shortest one liner
Change the UTC day from 6 to 5 if you want Array to start from Sunday.
const getWeekDays = (locale) => [...Array(7).keys()].map((v)=>new Date(Date.UTC(1970, 0, 6+v)).toLocaleDateString(locale, { weekday: 'long' }));
console.log(getWeekDays('de-DE'));

This method doesn't require you to set a random date or know the stringLocale beforehand. This method is independent from predefined values.
The locale can be retrieved from the client.
Automatically fill the weekdays array in the string locale.
const locale = 'en-US' // Change this based on client settings
const date = new Date()
const weekdays = []
while(!weekdays[date.getDay()]) {
weekdays[date.getDay()] = date.toLocaleString(locale, { weekday: 'long'})
date.setDate(date.getDate() + 1)
}
console.log(weekdays)
If you want the locale names for the months as well;
const locale = 'en-US' // Change this based on client settings
const date = new Date()
date.setMonth(0) // Not strictly needed, but why not..
date.setDate(1) // Needed because if current date is >= 29, the month Feb can get skipped.
const months = []
while(!months[date.getMonth()]) {
months[date.getMonth()] = date.toLocaleString(locale, { month: 'long'})
date.setMonth(date.getMonth() + 1)
}
console.log(months)
I currently use it like this:
(As you can see, I make a clone of the current date and set the month and date to their first occurance)
const date = new Date()
let locale = navigator.languages
? navigator.languages[0]
: (navigator.language || navigator.userLanguage)
let clone = new Date(date.getFullYear(), 0, 1, 0, 0, 0, 0)
let weekdays = []
while (!weekdays[clone.getDay()]) {
weekdays[clone.getDay()] = {
index: clone.getDay(),
long: clone.toLocaleString(locale, { weekday: 'long' }),
short: clone.toLocaleString(locale, { weekday: 'short' })
}
clone.setDate(clone.getDate() + 1)
}
clone.setDate(clone.getDate() - weekdays.length) // Reset
let months = []
while (!months[clone.getMonth()]) {
months[clone.getMonth()] = {
index: clone.getMonth(),
long: clone.toLocaleString(locale, { month: 'long' }),
short: clone.toLocaleString(locale, { month: 'short' })
}
clone.setMonth(clone.getMonth() + 1)
}
clone.setMonth(clone.getMonth() - months.length) // Reset
let hours = []
while (!hours[clone.getHours()]) {
hours[clone.getHours()] = {
index: clone.getHours(),
hour24: clone.toLocaleTimeString(locale, { hour12: false, hour: '2-digit', minute: '2-digit' }),
hour12: clone.toLocaleTimeString(locale, { hour12: true, hour: 'numeric' })
}
clone.setHours(clone.getHours() + 1)
}
clone.setHours(clone.getHours() - hours.length) // Reset
console.log(locale)
console.log(weekdays)
console.log(months)
console.log(hours)
console.log(clone.toLocaleString())

Solution No.1
var today = new Date();
var day = today.getDay();
var days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"];
var dayname = days[day];
document.write(dayname);
Solution No.2
var today = new Date();
var day = today.getDay();
switch(day){
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
case 2:
day ="Tuesday";
break;
case 3:
day = "Wednesday";
break;
case 4:
day = "Thrusday";
break;
case 5:
day = "Friday";
break;
case 6:
day = "Saturday";
break;
}
document.write(day);

you can use an object
var days = {
'Mon': 'Monday',
'etc..': 'etc..',
'Fri': 'Friday'
}
var date = new Date().toString().split(' ')[0]; //get day abreviation first
console.log(days[date]);

Just use it:
function getWeekDayNames(format = 'short', locale = 'ru') {
const names = [];
const date = new Date('2020-05-24');
let days = 7;
while (days !== 0) {
date.setDate(date.getDate() + 1);
names.push(date.toLocaleDateString(locale, { weekday: format }));
days--;
}
return names;
}
About formats you can read here Documentation DateTimeFormat

var date = new Date(Date.UTC(2012, 11, 20, 3, 0, 0));
// request a weekday along with a long date
var options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
console.log(date.toLocaleDateString('de-DE', options));
// → "Donnerstag, 20. Dezember 2012"
// an application may want to use UTC and make that visible
options.timeZone = 'UTC';
options.timeZoneName = 'short';
console.log(date.toLocaleDateString('en-US', options));
// → "Thursday, December 20, 2012, UTC"

// Solve this problem with a function.
// The days of the week are: "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
function getDayName(dateString) {
let dayName = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"][new Date(dateString).getDay()];
return dayName;
}
let result = getDayName(10/12/2022);
console.log(result);

Not the best method, use an array instead. This is just an alternative method.
http://www.w3schools.com/jsref/jsref_getday.asp
var date = new Date();
var day = date.getDay();
You should really use google before you post here.
Since other people posted the array method I'll show you an alternative way using a switch statement.
switch(day) {
case 0:
day = "Sunday";
break;
case 1:
day = "Monday";
break;
... rest of cases
default:
// do something
break;
}
The above works, however, the array is the better alternative. You may also use if() statements however a switch statement would be much cleaner then several if's.