If you provide 0 as the dayValue in Date.setFullYear you get the last day of the previous month:
d = new Date(); d.setFullYear(2008, 11, 0); // Sun Nov 30 2008
There is reference to this behaviour at mozilla. Is this a reliable cross-browser feature or should I look at alternative methods?
var month = 0; // January
var d = new Date(2008, month + 1, 0);
console.log(d.toString()); // last day in January
IE 6: Thu Jan 31 00:00:00 CST 2008
IE 7: Thu Jan 31 00:00:00 CST 2008
IE 8: Beta 2: Thu Jan 31 00:00:00 CST 2008
Opera 8.54: Thu, 31 Jan 2008 00:00:00 GMT-0600
Opera 9.27: Thu, 31 Jan 2008 00:00:00 GMT-0600
Opera 9.60: Thu Jan 31 2008 00:00:00 GMT-0600
Firefox 2.0.0.17: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Firefox 3.0.3: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Google Chrome 0.2.149.30: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Safari for Windows 3.1.2: Thu Jan 31 2008 00:00:00 GMT-0600 (Canada Central Standard Time)
Output differences are due to differences in the toString() implementation, not because the dates are different.
Of course, just because the browsers identified above use 0 as the last day of the previous month does not mean they will continue to do so, or that browsers not listed will do so, but it lends credibility to the belief that it should work the same way in every browser.
I find this to be the best solution for me. Let the Date object calculate it for you.
var today = new Date();
var lastDayOfMonth = new Date(today.getFullYear(), today.getMonth()+1, 0);
Setting day parameter to 0 means one day less than first day of the month which is last day of the previous month.
I would use an intermediate date with the first day of the next month, and return the date from the previous day:
int_d = new Date(2008, 11+1,1);
d = new Date(int_d - 1);
In computer terms, new Date() and regular expression solutions are slow! If you want a super-fast (and super-cryptic) one-liner, try this one (assuming m is in Jan=1 format). I keep trying different code changes to get the best performance.
My current fastest version:
After looking at this related question Leap year check using bitwise operators (amazing speed) and discovering what the 25 & 15 magic number represented, I have come up with this optimized hybrid of answers (note the parameters m & y must obviously be integers for this to work):
function getDaysInMonth(m, y) {
return m===2 ? y & 3 || !(y%25) && y & 15 ? 28 : 29 : 30 + (m+(m>>3)&1);
}
Given the bit-shifting this obviously assumes that your m & y parameters are both integers, as passing numbers as strings would result in weird results.
JSFiddle: http://jsfiddle.net/TrueBlueAussie/H89X3/22/
JSPerf results: http://jsperf.com/days-in-month-head-to-head/5
For some reason, (m+(m>>3)&1) is more efficient than (5546>>m&1) on almost all browsers.
The only real competition for speed is from #GitaarLab, so I have created a head-to-head JSPerf for us to test on: http://jsperf.com/days-in-month-head-to-head/5
It works based on my leap year answer here: javascript to find leap year this answer here Leap year check using bitwise operators (amazing speed) as well as the following binary logic.
A quick lesson in binary months:
If you interpret the index of the desired months (Jan = 1) in binary you will notice that months with 31 days either have bit 3 clear and bit 0 set, or bit 3 set and bit 0 clear.
Jan = 1 = 0001 : 31 days
Feb = 2 = 0010
Mar = 3 = 0011 : 31 days
Apr = 4 = 0100
May = 5 = 0101 : 31 days
Jun = 6 = 0110
Jul = 7 = 0111 : 31 days
Aug = 8 = 1000 : 31 days
Sep = 9 = 1001
Oct = 10 = 1010 : 31 days
Nov = 11 = 1011
Dec = 12 = 1100 : 31 days
That means you can shift the value 3 places with >> 3, XOR the bits with the original ^ m and see if the result is 1 or 0 in bit position 0 using & 1. Note: It turns out + is slightly faster than XOR (^) and (m >> 3) + m gives the same result in bit 0.
JSPerf results: http://jsperf.com/days-in-month-perf-test/6
My colleague stumbled upon the following which may be an easier solution
function daysInMonth(iMonth, iYear)
{
return 32 - new Date(iYear, iMonth, 32).getDate();
}
stolen from http://snippets.dzone.com/posts/show/2099
A slight modification to solution provided by lebreeze:
function daysInMonth(iMonth, iYear)
{
return new Date(iYear, iMonth, 0).getDate();
}
I recently had to do something similar, this is what I came up with:
/**
* Returns a date set to the begining of the month
*
* #param {Date} myDate
* #returns {Date}
*/
function beginningOfMonth(myDate){
let date = new Date(myDate);
date.setDate(1)
date.setHours(0);
date.setMinutes(0);
date.setSeconds(0);
return date;
}
/**
* Returns a date set to the end of the month
*
* #param {Date} myDate
* #returns {Date}
*/
function endOfMonth(myDate){
let date = new Date(myDate);
date.setDate(1); // Avoids edge cases on the 31st day of some months
date.setMonth(date.getMonth() +1);
date.setDate(0);
date.setHours(23);
date.setMinutes(59);
date.setSeconds(59);
return date;
}
Pass it in a date, and it will return a date set to either the beginning of the month, or the end of the month.
The begninngOfMonth function is fairly self-explanatory, but what's going in in the endOfMonth function is that I'm incrementing the month to the next month, and then using setDate(0) to roll back the day to the last day of the previous month which is a part of the setDate spec:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/setDate
https://www.w3schools.com/jsref/jsref_setdate.asp
I then set the hour/minutes/seconds to the end of the day, so that if you're using some kind of API that is expecting a date range you'll be able to capture the entirety of that last day. That part might go beyond what the original post is asking for but it could help someone else looking for a similar solution.
Edit: You can also go the extra mile and set milliseconds with setMilliseconds() if you want to be extra precise.
How NOT to do it
Beware of any answers for the last of the month that look like this:
var last = new Date(date)
last.setMonth(last.getMonth() + 1) // This is the wrong way to do it.
last.setDate(0)
This works for most dates, but fails if date is already the last day of the month, on a month that has more days than the following month.
Example:
Suppose date is 07/31/21.
Then last.setMonth(last.getMonth() + 1) increments the month, but keeps the day set at 31.
You get a Date object for 08/31/21,
which is actually 09/01/21.
So then last.setDate(0) results in 08/31/21 when what we really wanted was 07/31/21.
try this one.
lastDateofTheMonth = new Date(year, month, 0)
example:
new Date(2012, 8, 0)
output:
Date {Fri Aug 31 2012 00:00:00 GMT+0900 (Tokyo Standard Time)}
This works for me.
Will provide last day of given year and month:
var d = new Date(2012,02,0);
var n = d.getDate();
alert(n);
This one works nicely:
Date.prototype.setToLastDateInMonth = function () {
this.setDate(1);
this.setMonth(this.getMonth() + 1);
this.setDate(this.getDate() - 1);
return this;
}
You can get the First and Last Date in the current month by following the code:
var dateNow = new Date();
var firstDate = new Date(dateNow.getFullYear(), dateNow.getMonth(), 1);
var lastDate = new Date(dateNow.getFullYear(), dateNow.getMonth() + 1, 0);
or if you want to format the date in your custom format then you can use moment js
var dateNow= new Date();
var firstDate=moment(new Date(dateNow.getFullYear(),dateNow.getMonth(), 1)).format("DD-MM-YYYY");
var currentDate = moment(new Date()).format("DD-MM-YYYY"); //to get the current date var lastDate = moment(new
Date(dateNow.getFullYear(), dateNow.getMonth() + 1, 0)).format("DD-MM-YYYY"); //month last date
This will give you current month first and last day.
If you need to change 'year' remove d.getFullYear() and set your year.
If you need to change 'month' remove d.getMonth() and set your year.
var d = new Date();
var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var fistDayOfMonth = days[(new Date(d.getFullYear(), d.getMonth(), 1).getDay())];
var LastDayOfMonth = days[(new Date(d.getFullYear(), d.getMonth() + 1, 0).getDay())];
console.log("First Day :" + fistDayOfMonth);
console.log("Last Day:" + LastDayOfMonth);
alert("First Day :" + fistDayOfMonth);
alert("Last Day:" + LastDayOfMonth);
Try this:
function _getEndOfMonth(time_stamp) {
let time = new Date(time_stamp * 1000);
let month = time.getMonth() + 1;
let year = time.getFullYear();
let day = time.getDate();
switch (month) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
day = 31;
break;
case 4:
case 6:
case 9:
case 11:
day = 30;
break;
case 2:
if (_leapyear(year))
day = 29;
else
day = 28;
break
}
let m = moment(`${year}-${month}-${day}`, 'YYYY-MM-DD')
return m.unix() + constants.DAY - 1;
}
function _leapyear(year) {
return (year % 100 === 0) ? (year % 400 === 0) : (year % 4 === 0);
}
const today = new Date();
let beginDate = new Date();
let endDate = new Date();
// fist date of montg
beginDate = new Date(
`${today.getFullYear()}-${today.getMonth() + 1}-01 00:00:00`
);
// end date of month
// set next Month first Date
endDate = new Date(
`${today.getFullYear()}-${today.getMonth() + 2}-01 :23:59:59`
);
// deducting 1 day
endDate.setDate(0);
Below function gives the last day of the month :
function getLstDayOfMonFnc(date) {
return new Date(date.getFullYear(), date.getMonth(), 0).getDate()
}
console.log(getLstDayOfMonFnc(new Date(2016, 2, 15))) // Output : 29
console.log(getLstDayOfMonFnc(new Date(2017, 2, 15))) // Output : 28
console.log(getLstDayOfMonFnc(new Date(2017, 11, 15))) // Output : 30
console.log(getLstDayOfMonFnc(new Date(2017, 12, 15))) // Output : 31
Similarly we can get first day of the month :
function getFstDayOfMonFnc(date) {
return new Date(date.getFullYear(), date.getMonth(), 1).getDate()
}
console.log(getFstDayOfMonFnc(new Date(2016, 2, 15))) // Output : 1
Here is an answer that conserves GMT and time of the initial date
var date = new Date();
var first_date = new Date(date); //Make a copy of the date we want the first and last days from
first_date.setUTCDate(1); //Set the day as the first of the month
var last_date = new Date(first_date); //Make a copy of the calculated first day
last_date.setUTCMonth(last_date.getUTCMonth() + 1); //Add a month
last_date.setUTCDate(0); //Set the date to 0, this goes to the last day of the previous month
console.log(first_date.toJSON().substring(0, 10), last_date.toJSON().substring(0, 10)); //Log the dates with the format yyyy-mm-dd
function getLastDay(y, m) {
return 30 + (m <= 7 ? ((m % 2) ? 1 : 0) : (!(m % 2) ? 1 : 0)) - (m == 2) - (m == 2 && y % 4 != 0 || !(y % 100 == 0 && y % 400 == 0));
}
set month you need to date and then set the day to zero ,so month begin in 1 - 31 in date function then get the last day^^
var last = new Date(new Date(new Date().setMonth(7)).setDate(0)).getDate();
console.log(last);
I know it's just a matter of semantics, but I ended up using it in this form.
var lastDay = new Date(new Date(2008, 11+1,1) - 1).getDate();
console.log(lastDay);
Since functions are resolved from the inside argument, outward, it works the same.
You can then just replace the year, and month / year with the required details, whether it be from the current date. Or a particular month / year.
If you need exact end of the month in miliseconds (for example in a timestamp):
d = new Date()
console.log(d.toString())
d.setDate(1)
d.setHours(23, 59, 59, 999)
d.setMonth(d.getMonth() + 1)
d.setDate(d.getDate() - 1)
console.log(d.toString())
The accepted answer doesn't work for me, I did it as below.
$( function() {
$( "#datepicker" ).datepicker();
$('#getLastDateOfMon').on('click', function(){
var date = $('#datepicker').val();
// Format 'mm/dd/yy' eg: 12/31/2018
var parts = date.split("/");
var lastDateOfMonth = new Date();
lastDateOfMonth.setFullYear(parts[2]);
lastDateOfMonth.setMonth(parts[0]);
lastDateOfMonth.setDate(0);
alert(lastDateOfMonth.toLocaleDateString());
});
});
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<link rel="stylesheet" href="/resources/demos/style.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
</head>
<body>
<p>Date: <input type="text" id="datepicker"></p>
<button id="getLastDateOfMon">Get Last Date of Month </button>
</body>
</html>
This will give you last day of current month.
notes: on ios device include time.
#gshoanganh
var date = new Date();
console.log(new Date(date.getFullYear(), date.getMonth() + 1, 0, 23, 59, 59));
if you just need to get the last date of a month following worked out for me.
var d = new Date();
const year = d.getFullYear();
const month = d.getMonth();
const lastDay = new Date(year, month +1, 0).getDate();
console.log(lastDay);
try it out here https://www.w3resource.com/javascript-exercises/javascript-date-exercise-9.php
In my case, this code was useful
end_date = new Date(2018, 3, 1).toISOString().split('T')[0]
console.log(end_date)
Related
const currentWeek = () => {
var startOfWeek = moment().startOf('isoWeek');
var endOfWeek = moment().endOf('isoWeek');
var days = [];
var day = startOfWeek;
while (day <= endOfWeek) {
days.push(day.toDate());
day = day.clone().add(1, 'd');
}
console.log('Week Start-----', moment(startOfWeek).utc().format('DD MMMM YYYY'));
console.log('Week End-----',
moment(endOfWeek).utc().format('DD MMMM YYYY'));
Log -
// Week Start----- 03 July 2022
//Week End----- 10 July 2022
I want to find out number of points earned from week start to week end, from the data coming through api
I'm using FullCalendar v4-alpha-3 with the RRule plugin to generate recurring events. It works as expected with only one problem: how do I modify a recurring event to account for months with fewer days than the starting month in a series?
For example, if the first monthly occurrence happens on January 29, 2019; the event will be repeated on the 29th of all subsequent months except in February since it only has 28 days (leap years excluded).
I've tried resetting dtstart to the first day of the following month. It works, except the event is no longer recursive.
Here's a stripped down snippet of my setup:
let calendar = new Calendar(calendarEl, {
plugins: [ rrulePlugin ],
events: [
{
rrule: 'DTSTART:20190129 RRULE:FREQ=MONTHLY;UNTIL=20200130;COUNT=13;BYMONTHDAY=29'
}
],
eventRender: function(info) {
...
// reset start date to the first day of the following month
// if current month has fewer days than base month
let start = event.start;
let day = start.getDate();
let now = new Date();
let currentMonth = now.getMonth();
let currentYear = now.getFullYear();
let daysInCurrent = getDaysInMonth(currentMonth + 1, currentYear);
let nextStart = start;
if (day > daysInCurrent) {
nextStart = new Date(currentYear, currentMonth + 1, 1);
event.setStart(nextStart);
event.setEnd(null);
}
}
});
I'd appreciate any insight.
Not quite the solution I hoped for, but RRule's bysetpos property seems to offer the next best alternative as it allows for a fallback date in case the one specified doesn't exist.
For example, the following would generate an occurrence on the 30th of every month; or the last day of the month if the 30th doesn’t exist:
FREQ=MONTHLY;BYMONTHDAY=28,29,30;BYSETPOS=-1.
Sourced from: https://icalevents.com/2555-paydays-last-working-days-and-why-bysetpos-is-useful/
I know this is an old question but maybe this will be usefull for someone:
I'm using momentjs library
monthly:
let endofmonth = moment('2020-02-29', "YYYY-MM-DD").endOf('month').format('DD');
let curday = moment('2020-02-29, "YYYY-MM-DD").format('DD');
single_event.title = title;
single_event.rrule = {};
single_event.rrule.freq = 'monthly';
single_event.rrule.dtstart = start_date;
single_event.rrule.interval = reminder_interval;
single_event.rrule.count = reminder_count;
if(endofmonth == curday){
// Checking if given day of the month is last
single_event.rrule.byweekday = ['mo','tu','we','th','fr','sa','su'];
single_event.rrule.bysetpos = -1;
}
else{
single_event.rrule.bymonthday = parseInt(curday);
}
calendar_events.push(single_event);
var calendar = new FullCalendar.Calendar(calendarEl, {
...
events: calendar_events
});
yearly:
single_event.title = title;
single_event.rrule = {};
single_event.rrule.dtstart = start_date;
single_event.rrule.count = parseInt(reminder_count);
if(endofmonth == curday){
// Checking if given day of the month is last
single_event.rrule.freq = 'monthly'; // Will work as yearly if interval is 12
single_event.rrule.interval = parseInt(reminder_interval)*12;
single_event.rrule.bymonthday = [28,29,30,31];
single_event.rrule.bysetpos = -1;
}
else{
single_event.rrule.freq = 'yearly';
single_event.rrule.bymonthday = parseInt(curday);
}
calendar_events.push(single_event);
var calendar = new FullCalendar.Calendar(calendarEl, {
...
events: calendar_events
});
I am trying to implement a query already written for Teradata in Hive and was using weekofyear() until now as a replacement of TD_WEEK_OF_CALENDAR method which returns an INTEGER value representing the number of full weeks since and including the week of 01/01/1900, where the first partial week is 0.
I couldn't find any other predefined UDF in Hive related to this method. Even for writing a custom UDF in Java, I was not able to get the exact logic of TD_WEEK_OF_CALENDAR.
Can someone please help on this?
This can be achieved using the Joda time functions. But Hive doesn't support Joda time Jars and you need to explicitly add the joda-time jars to your hive lib folder.
The function TD_WEEK_OF_CALENDAR treats Sunday as first day of week and Saturday as last whereas the joda-time function getDayOfWeek() treats Sunday as last day of the week giving its number as 7 which pulls Sunday into the same week.
This below code would to the needful
public Text evaluate(Text input) {
if(null != input){
String date = input.toString();
StringTokenizer st = new StringTokenizer(date, "-");
int year = Integer.parseInt(st.nextToken());
int month = Integer.parseInt(st.nextToken());
int day = Integer.parseInt(st.nextToken());
DateTime dateTime1 = new DateTime(1900, 1, 1, 0, 0, 0, 0);
DateTime dateTime2 = new DateTime(year, month, day, 0, 0, 0, 0);
int weeksDiff = dateTime2.getDayOfWeek() == 7 ? Weeks.weeksBetween(
dateTime1, dateTime2).getWeeks() + 1 : Weeks.weeksBetween(
dateTime1, dateTime2).getWeeks();
String weeks = weeksDiff + "";
return new Text(weeks);
} else {
return null;
}
basically I am setting up a age verification script for a alcohol company and each country of course has a specific age to consume or buy alcohol.
I have set up the basics just now but I am running in to a problem. Right now I want to be able to gather there DOB using the input fields. Convert this to a date and them somehow compare it to the legal drinking age of the country in question.
Unfortunately testing the DOB is proving difficult and I know it is a problem with the event handler I am using as it won't output my required result to the console.
If anyone could help that would be fantastic.
Here is a link to my fiddle.
var countries = {
"Albania": 18,
"Algeria": 18,
"Argentina": 21,
"Armeria": 18,
"Australia": 18,
"Austria": 18
};
var individualCountry;
var day;
var month;
var year;
$("#verify").submit(function() {
day = $("#day").val();
month = $("#month").val();
year = $("#year").val();
var fullDate = day + month + year;
console.log(fullDate);
individualCountry = $("#countries").val();
var ageLimit = countries[individualCountry];
if (personsAge >= ageLimit) {
}
})
https://jsfiddle.net/h989qrLs/
try this code
function_calculateAge(birthday) { // birthday is a date
var ageDifMs = Date.now() - birthday.getTime();
var ageDate = new Date(ageDifMs); // miliseconds from epoch
return Math.abs(ageDate.getUTCFullYear() - 1970);
}
for more details open this link by André Snede Hansen
In my MVC application I am storing dates in UTC. In my view I am doing this to show the dates in date time pickers in local time
<div class="datetimepicker">#(Html.Kendo().DateTimePickerFor(m => m.StartDateTime).Value(Model.StartDateTime.ToLocalTime()))</div>
The problem is that when the datetimes arereturned in the post methods back to the server they are returned in local time. Is there a way from the view to return the datetimes in UTC?
Hi datetimepicker in kendo i dono abt it,but just a thought if u can get the value from datetimepicker and pass through a function as below which converts to UTC and then send it to server , i believe ur task is complete..sry if i am wrong...
function convertToUtc(str) {
var date = new Date(str);
var year = date.getUTCFullYear();
var month = date.getUTCMonth()+1;
var dd = dategetUTCDate();
var hh = date.getUTCHours();
var mi = date.getUTCMinutes();
var sec = date.getUTCSeconds();
// 2010-11-12T13:14:15Z
theDate = year + "-" + (month [1] ? month : "0" + month [0]) + "-" +
(dd[1] ? dd : "0" + dd[0]);
theTime = (hh[1] ? hh : "0" + hh[0]) + ":" + (mi[1] ? mi : "0" + mi[0]);
return [ theDate, theTime ].join("T");
}
Your question is a good one and the approach that we suggest is covered in this code library article.