Printing 3 year calendar in months staring from the current month - javascript

I am getting the current date in javascript and then I convert it to the current month. Based on the current month (9 now), I want to print the month calendar for the last 3 years backwards. So, if we have September 2013, the following has to be printed:
08 09 10 11 12 2010
01 02 03 04 05 06 07 08 09 10 11 12 2011
01 02 03 04 05 06 07 08 09 10 11 12 2012
01 02 03 04 05 06 07 08 2013
I have a general idea how to print the first line, but I'm struggling how to print the rest of the calendar. Here is my code for the first line (2013):
function printCalendarRows(){
var d = new Date();
var n = (d.getMonth()) + 1;
var twelve = 12;
for(var i = n; i <= 12; i++){
for(var j = 12; j >= n; j--){
console.log(i);
console.log(j);
}
}
}
Any recommendations? Thanks

function calRows() {
var date,
now = new Date(),
str = "";
for (var i = -37;i++;) {
date = new Date(now.getFullYear(), now.getMonth() + i - 1, 1)
month = ("0" + (date.getMonth() + 1)).slice(-2);
str += month + " " + (+month % 12 == 0 ? date.getFullYear() + "\n" : "")
}
return str + date.getFullYear();
}
console.log (calRows()) /*
08 09 10 11 12 2010
01 02 03 04 05 06 07 08 09 10 11 12 2011
01 02 03 04 05 06 07 08 09 10 11 12 2012
01 02 03 04 05 06 07 08 2013 */
Heres a Fiddle
Or if you prefer, the same without assigning a new Date object in the loop.
function calRows() {
var date,
now = new Date(),
first = new Date(now.getFullYear(), now.getMonth() -37, 1),
monthYear = [first.getMonth(),first.getFullYear()]
str = "";
for (var i = -37;i++;) {
month = ("0" + (++monthYear[0])).slice(-2);
str += month + " " + (+month % 12 == 0 ? (monthYear[0]=0,monthYear[1]++) + "\n" : "")
}
return str + monthYear[1]
}

Check if this is what you want
function printCalendarRows(){
var d = new Date();
var o = new Date();
o.setMonth( (d.getMonth()) - 36); //or o.setFullYear( (d.getFullYear()) - 3);
var currnt;
while (o < d)
{
currnt = o.getMonth();
console.log(currnt);
if (currnt == 11)
{
console.log(o.getFullYear());
}
o.setMonth(currnt+1);
}
if (d.getMonth() != 11)
{
console.log(d.getFullYear());
}
alert("Date:"+ d + "Month:" + d.getMonth());
}

I would use momentjs:
function printCalendarRows(){
var d = moment().subtract('months', 37);
var y = d.format("YYYY");
var n = moment().format("MM/YYYY");
var log = "";
while(d.format("MM/YYYY") != n) {
if (d.format("YYYY") != y) {
console.log(log + y + "\r\n");
y = d.format("YYYY");
log = "";
}
log += d.format("MM") + " ";
d = d.add("months", 1);
}
console.log(log + d.format("YYYY"));
}
printCalendarRows();
working DEMO

Related

get last 14 Dates

Hey i want to get the last 14 days in JavaScript.
I tried following code:
var ourDate = new Date();
for (let index = 0; index < 14; index++) {
var pastDate = ourDate.getDate() - index;
ourDate.setDate(pastDate);
console.log(ourDate.toDateString(), " - ", index);
}
but the console output is following:
Sat Jan 23 2021 - 0
Fri Jan 22 2021 - 1
Wed Jan 20 2021 - 2
Sun Jan 17 2021 - 3
Wed Jan 13 2021 - 4
Fri Jan 08 2021 - 5
Sat Jan 02 2021 - 6
Sat Dec 26 2020 - 7
Fri Dec 18 2020 - 8
Wed Dec 09 2020 - 9
Sun Nov 29 2020 - 10
Wed Nov 18 2020 - 11
Fri Nov 06 2020 - 12
Sat Oct 24 2020 - 13
Which does not make sense.
Could someone help me with this?
I used this code: LINK TO TUTORIAL
I just solved it myself.
I never retested the ourDate so it first removed 0 than 1 than 2 but never reseted.
Just have to create the ourDate in the for loop:
for (let index = 0; index < 14; index++) {
var ourDate = new Date();
var pastDate = ourDate.getDate() - index;
ourDate.setDate(pastDate);
console.log(ourDate.toDateString(), " - ", index);
}
You can try this snippet:
const now = new Date();
const days = Array.from({ length: 14 }, (_, x) => new Date(now - 1000 * 60 * 60 * 24 * x));
for (let day of days) console.log(day.toDateString());
Or a more general solution:
const msInDay = 1000 * 60 * 60 * 24;
const daysAgo = (date, count) => new Date(date - msInDay * count);
const lastDays = (date, count) => Array.from({ length: count }, (_, x) => daysAgo(date, x));
const last14days = lastDays(new Date(), 14);
for (let day of last14days) console.log(day.toDateString());

Strange behavior when using Date.setDate() incremental by day

I am working on a functionality where I'd like to iterate particular dates between Date_A and Date_B.
Problem is when 'DateB' is in next month so the iterating process is overlapping to next month. Please see a line 12 of output. It seems like it starts incrementing months instead of days... Any suggestions, please? :)
iter: 0 , inspectedDate: Mon Apr 22 2019 00:00:00 GMT+0000 (UTC)
iter: 1 , inspectedDate: Tue Apr 23 2019 00:00:00 GMT+0000 (UTC)
iter: 2 , inspectedDate: Wed Apr 24 2019 00:00:00 GMT+0000 (UTC)
iter: 3 , inspectedDate: Thu Apr 25 2019 00:00:00 GMT+0000 (UTC)
iter: 4 , inspectedDate: Fri Apr 26 2019 00:00:00 GMT+0000 (UTC)
iter: 5 , inspectedDate: Sat Apr 27 2019 00:00:00 GMT+0000 (UTC)
iter: 6 , inspectedDate: Sun Apr 28 2019 00:00:00 GMT+0000 (UTC)
iter: 7 , inspectedDate: Mon Apr 29 2019 00:00:00 GMT+0000 (UTC)
iter: 8 , inspectedDate: Tue Apr 30 2019 00:00:00 GMT+0000 (UTC)
iter: 9 , inspectedDate: Wed May 01 2019 00:00:00 GMT+0000 (UTC)
iter: 10 , inspectedDate: Sat Jun 01 2019 00:00:00 GMT+0000 (UTC)
iter: 11 , inspectedDate: Wed Jul 03 2019 00:00:00 GMT+0000 (UTC)
iter: 12 , inspectedDate: Sat Aug 03 2019 00:00:00 GMT+0000 (UTC)
iter: 13 , inspectedDate: Wed Sep 04 2019 00:00:00 GMT+0000 (UTC)
example here: https://repl.it/repls/QuerulousSelfreliantDatabase
const inspectedDate = new Date('2019-04-22');
const today = new Date('2019-04-22');
let intervalCorrection = 0;
for (let dayOffset = 0; dayOffset < requestInterval; dayOffset++) {
inspectedDate.setDate(today.getDate() + dayOffset);
console.log('iter: ' + dayOffset, ', inspectedDate: ' + inspectedDate);
}
Try 'reseting' inspectedDate every iteration. Worked fine for me.
Changes I made to your code snippet:
const requestInterval = 14;
let today = new Date('2019-04-22').getDate();
let intervalCorrection = 0;
for (let dayOffset = 0; dayOffset < requestInterval; dayOffset++) {
const inspectedDate = new Date('2019-04-22');
inspectedDate.setDate(today + dayOffset);
console.log('iter: ' + dayOffset, ', inspectedDate: ' + inspectedDate);
}
The problem is that when you setDate and it's more than the current month's days that changes the month. Adding a bigger number again changes the mongth again:
const date = new Date("2019-02-01");
let day = 31;
let offset = 1;
date.setDate(day + offset); //goes to March
offset++;
console.log(date.toString());
date.setDate(day + offset); //goes to April
offset++;
console.log(date.toString());
Since you add a constant 22 (the value of today.getDate()) each time, you very quickly get to 30 and above which will start rolling over each month.
If you just want each consecutive day, then you don't need to have two dates and do a lot of calculations - just use a single date and increment the day by 1 each time - this will give you each day:
const inspectedDate = new Date('2019-04-22');
const requestInterval = 14;
for (let i = 0; i < requestInterval; i++) {
inspectedDate.setDate(inspectedDate.getDate() + 1); //advance one day
console.log('iter: ' + i, ', inspectedDate: ' + inspectedDate);
}
The problem here lies in that you are storing the date variable in a constant and altering its date using setDate only. This results in its moth getting changed which you are not handling.
On iter 9, it sets the date to 22 + 9, i.e, 31. But the month is 4(Apr) which is a 30 day month. So the date changes to Wed May 01 2019 00:00:00 GMT+0000 (UTC)
On iter 10, it sets the date to 22 + 10, i.e, 32. But the month is now 5(May) which is a 31 day month. So the date changes to Sat Jun 01 2019 00:00:00 GMT+0000 (UTC)
On iter 11, it sets the date to 33. The month is 6(Jun). So the date changes to Wed Jul 03 2019 00:00:00 GMT+0000 (UTC)
and so on...
I can think of 2 ways to avoid it:
First
Create a new variable each time
const requestInterval = 14;
const today = new Date('2019-04-22');
let intervalCorrection = 0;
for (let dayOffset = 0; dayOffset < requestInterval; dayOffset++) {
const inspectedDate = new Date('2019-04-22');
inspectedDate.setDate(today.getDate() + dayOffset);
console.log('iter: ' + dayOffset, ', inspectedDate: ' + inspectedDate);
}
Second
Update the month and year as well before updating date
const requestInterval = 14;
const inspectedDate = new Date('2019-04-22');
const today = new Date('2019-04-22');
let intervalCorrection = 0;
for (let dayOffset = 0; dayOffset < requestInterval; dayOffset++) {
inspectedDate.setMonth(today.getMonth());
inspectedDate.setYear(today.getYear());
inspectedDate.setDate(today.getDate() + dayOffset);
console.log('iter: ' + dayOffset, ', inspectedDate: ' + inspectedDate);
}
Firstly, convert your date to milliseconds.
Secondly, iterate ms in day over your date.
const today = new Date('2019-04-22');
let intervalCorrection = 0;
const millisecsInDay = 1000 * 60 * 60 * 24;
for (let dayOffset = 0; dayOffset < 14; dayOffset++) {
const inspectedDate = new Date(today.getTime() + dayOffset * millisecsInDay);
console.log('iter: ' + dayOffset, ', inspectedDate: ' + inspectedDate);
}

how to convert a date time string unto a specified date time format

Anyone knows how to convert this
Wed Dec 02 2015 00:00:00 GMT+0800 (China Standard Time)
to
2015-12-02 00:00:00
any ideas, help, clues, suggestions, recommendations will be greatly appreciated.
Just go with moment.js.
var time = 'Wed Dec 02 2015 00:00:00 GMT+0800 (China Standard Time)';
var format = moment(time).format('YYYY-MM-DD HH:mm:ss');
Here is jsfiddle.
Try this:
var temp = new Date("Wed Dec 02 2015 00:00:00 GMT+0800 (China Standard Time)");
console.log(temp.getFullYear() + "-" +(temp.getMonth() + 1) + "-" + temp.getDate());
console.log(temp.getHours() + ":" + temp.getMinutes() + ":" + temp.getSeconds());
Sorry, had to run downstairs. Forget the regex, just slice it up and use it together like this. (http://jsfiddle.net/u2xn2Lv5/1/)
JS:
var origTime = "Wed Dec 02 2015 00:00:00 GMT+0800 (China Standard Time)";
//or function you call to derive this data stringified
var dayVal = origTime.slice(8,10);
var yearVal = origTime.slice(11,15);
var monthVal = origTime.slice(4,7);
var timeVal = origTime.slice(16,23);
var newDate = ""; // Hasn't been set yet
//alert(monthVal);
switch(monthVal) {
case "Dec":
newDate = "12";
break;
case "Jan":
newDate = "1";
break;
case "Jun":
newDate = "6";
break;
default:
"unknown month!"
};
var newTime = newDate + "-" + dayVal + "-" + yearVal + "-" + timeVal;
document.getElementById("spanthing").innerHTML = newTime;
HTML:
<div id="spanthing"></div>
To be rearranged as needed! Cheers!
You could try this
moment(yourDate).format("YYYY-MM-DD HH:mm:ss");
var d = Date.parse("Wed Dec 02 2015 00:00:00 GMT+0800");
d = new Date(d).toLocaleString();
use this then:
var d = Date.parse("Wed Dec 02 2015 00:00:00 GMT+0800");
d = new Date(d).toLocaleString();
d.replace(/\d+\/\d+\/\d{4},/, function (x){
x = x.replace(/,/, "");
x = x.split("/");
return x[2] + "-" + x[1] + "-" + x[0];
});

moment JS get number of weeks in a month

I am trying to calculate number of weeks in a month using moment js. But I am getting wrong results for some months like May 2015 and August 2015.
I am using this code.
var start = moment().startOf('month').format('DD');
var end = moment().endOf('month').format('DD');
var weeks = (end-start+1)/7;
weeks = Math.ceil(weeks);
Is there any prebuilt method in moment JS for getting number of weeks.
I have created this gist that finds all the weeks in a given month and year. By calculated the length of calendar, you will know the number of weeks.
https://gist.github.com/guillaumepiot/095b5e02b4ca22680a50
# year and month are variables
year = 2015
month = 7 # August (0 indexed)
startDate = moment([year, month])
# Get the first and last day of the month
firstDay = moment(startDate).startOf('month')
endDay = moment(startDate).endOf('month')
# Create a range for the month we can iterate through
monthRange = moment.range(firstDay, endDay)
# Get all the weeks during the current month
weeks = []
monthRange.by('days', (moment)->
if moment.week() not in weeks
weeks.push(moment.week())
)
# Create a range for each week
calendar = []
for week in weeks
# Create a range for that week between 1st and 7th day
firstWeekDay = moment().week(week).day(1)
lastWeekDay = moment().week(week).day(7)
weekRange = moment.range(firstWeekDay, lastWeekDay)
# Add to the calendar
calendar.push(weekRange)
console.log calendar
Can be easily done using raw javascript:
function getNumWeeksForMonth(year,month){
date = new Date(year,month-1,1);
day = date.getDay();
numDaysInMonth = new Date(year, month, 0).getDate();
return Math.ceil((numDaysInMonth + day) / 7);
}
You get the day index of the first day, add it to the number of days to compensate for the number of days lost in the first week, divide by 7 and use ceil to add 1 for the simplest overflow in the next week
It display the list of weeks in a month with 'moment.js'.
It has been written in typescript with angular 6+.
Install moment with 'npm i moment'
Inside the ts file.
weeks_in_month() {
let year = 2019; // change year
let month = 4; // change month here
let startDate = moment([year, month - 1])
let endDate = moment(startDate).endOf('month');
var dates = [];
var weeks = [];
var per_week = [];
var difference = endDate.diff(startDate, 'days');
per_week.push(startDate.toDate())
let index = 0;
let last_week = false;
while (startDate.add(1, 'days').diff(endDate) < 0) {
if (startDate.day() != 0) {
per_week.push(startDate.toDate())
}
else {
if ((startDate.clone().add(7, 'days').month() == (month - 1))) {
weeks.push(per_week)
per_week = []
per_week.push(startDate.toDate())
}
else if (Math.abs(index - difference) > 0) {
if (!last_week) {
weeks.push(per_week);
per_week = [];
}
last_week = true;
per_week.push(startDate.toDate());
}
}
index += 1;
if ((last_week == true && Math.abs(index - difference) == 0) ||
(Math.abs(index - difference) == 0 && per_week.length == 1)) {
weeks.push(per_week)
}
dates.push(startDate.clone().toDate());
}
console.log(weeks);
}
Result:
Array of date moments.
[Array(6), Array(7), Array(7), Array(7), Array(3)]
0: (6) [Mon Apr 01 2019 00:00:00 GMT+0530 (India Standard Time),
Tue Apr 02 2019 00:00:00 GMT+0530 (India Standard Time),
Wed Apr 03 2019 00:00:00 GMT+0530 (India Standard Time),
Thu Apr 04 2019 00:00:00 GMT+0530 (India Standard Time),
Fri Apr 05 2019 00:00:00 GMT+0530 (India Standard Time),
Sat Apr 06 2019 00:00:00 GMT+0530 (India Standard Time)]
1: (7) [Sun Apr 07 2019 00:00:00 GMT+0530 (India Standard Time),
Mon Apr 08 2019 00:00:00 GMT+0530 (India Standard Time),
Tue Apr 09 2019 00:00:00 GMT+0530 (India Standard Time),
Wed Apr 10 2019 00:00:00 GMT+0530 (India Standard Time),
Thu Apr 11 2019 00:00:00 GMT+0530 (India Standard Time),
Fri Apr 12 2019 00:00:00 GMT+0530 (India Standard Time),
Sat Apr 13 2019 00:00:00 GMT+0530 (India Standard Time)]
2: (7) [Sun Apr 14 2019 00:00:00 GMT+0530 (India Standard Time),
Mon Apr 15 2019 00:00:00 GMT+0530 (India Standard Time),
Tue Apr 16 2019 00:00:00 GMT+0530 (India Standard Time),
Wed Apr 17 2019 00:00:00 GMT+0530 (India Standard Time),
Thu Apr 18 2019 00:00:00 GMT+0530 (India Standard Time),
Fri Apr 19 2019 00:00:00 GMT+0530 (India Standard Time),
Sat Apr 20 2019 00:00:00 GMT+0530 (India Standard Time)]
3: (7) [Sun Apr 21 2019 00:00:00 GMT+0530 (India Standard Time),
Mon Apr 22 2019 00:00:00 GMT+0530 (India Standard Time),
Tue Apr 23 2019 00:00:00 GMT+0530 (India Standard Time),
Wed Apr 24 2019 00:00:00 GMT+0530 (India Standard Time),
Thu Apr 25 2019 00:00:00 GMT+0530 (India Standard Time),
Fri Apr 26 2019 00:00:00 GMT+0530 (India Standard Time),
Sat Apr 27 2019 00:00:00 GMT+0530 (India Standard Time)]
4: (3) [Sun Apr 28 2019 00:00:00 GMT+0530 (India Standard Time),
Mon Apr 29 2019 00:00:00 GMT+0530 (India Standard Time),
Tue Apr 30 2019 00:00:00 GMT+0530 (India Standard Time)]
EDIT:
NEW and hopefully very correct implementation:
function calcWeeksInMonth(date: Moment) {
const dateFirst = moment(date).date(1);
const dateLast = moment(date).date(date.daysInMonth());
const startWeek = dateFirst.isoWeek();
const endWeek = dateLast.isoWeek();
if (endWeek < startWeek) {
// Yearly overlaps, month is either DEC or JAN
if (dateFirst.month() === 0) {
// January
return endWeek + 1;
} else {
// December
if (dateLast.isoWeekday() === 7) {
// Sunday is last day of year
return endWeek - startWeek + 1;
} else {
// Sunday is NOT last day of year
return dateFirst.isoWeeksInYear() - startWeek + 1;
}
}
} else {
return endWeek - startWeek + 1;
}
}
Outputs the following values for the following dates:
calcWeeksInMonth(moment("2016-12-01")); // 5
calcWeeksInMonth(moment("2017-01-01")); // 6
calcWeeksInMonth(moment("2017-02-01")); // 5
calcWeeksInMonth(moment("2017-03-01")); // 5
calcWeeksInMonth(moment("2017-04-01")); // 5
calcWeeksInMonth(moment("2017-05-01")); // 5
calcWeeksInMonth(moment("2017-06-01")); // 5
calcWeeksInMonth(moment("2017-07-01")); // 6
calcWeeksInMonth(moment("2017-08-01")); // 5
calcWeeksInMonth(moment("2017-09-01")); // 5
calcWeeksInMonth(moment("2017-10-01")); // 6
calcWeeksInMonth(moment("2017-11-01")); // 5
calcWeeksInMonth(moment("2017-12-01")); // 5
calcWeeksInMonth(moment("2018-01-01")); // 5
OLD and very incorrect implementation:
calcWeeksInMonth(date) {
const dateFirst = moment(date).date(1)
const dateLast = moment(date).date(date.daysInMonth())
const startWeek = dateFirst.week()
const endWeek = dateLast.week()
if (endWeek < startWeek) {
return dateFirst.weeksInYear() - startWeek + 1 + endWeek
} else {
return endWeek - startWeek + 1
}
}
This seems to output correct results, feedback welcome if there is something I missed!
function getWeekNums(momentObj) {
var clonedMoment = moment(momentObj), first, last;
// get week number for first day of month
first = clonedMoment.startOf('month').week();
// get week number for last day of month
last = clonedMoment.endOf('month').week();
// In case last week is in next year
if( first > last) {
last = first + last;
}
return last - first + 1;
}
javaScript version here
var year = 2021
var month = 6
var startDate = moment([year, month])
//Get the first and last day of the month
var firstDay = moment(startDate).startOf('month')
var endDay = moment(startDate).endOf('month')
//Create a range for the month we can iterate through
var monthRange = moment.range(firstDay, endDay)
//Get all the weeks during the current month
var weeks = []
var indexOf = [].indexOf;
monthRange.by('days', function (moment) {
var ref;
if (ref = moment.week(), indexOf.call(weeks, ref) < 0) {
return weeks.push(moment.week());
}
});
var calendar, firstWeekDay, i, lastWeekDay, len, week, weekRange;
calendar = [];
for (i = 0, len = weeks.length; i < len; i++) {
week = weeks[i];
// Create a range for that week between 1st and 7th day
firstWeekDay = moment().week(week).day(0);
lastWeekDay = moment().week(week).day(6);
weekRange = moment.range(firstWeekDay, lastWeekDay);
// Add to the calendar
calendar.push(weekRange);
}
This is the best way out , works well
moment.relativeTime.dd = function (number) {
// round to the closest number of weeks
var weeks = Math.round(number / 7);
if (number < 7) {
// if less than a week, use days
return number + " days";
} else {
// pluralize weeks
return weeks + " week" + (weeks === 1 ? "" : "s");
}
}
Source:How to get duration in weeks with Moment.js?
I have not seen a solution that works in all circumstances. I tried all of these but they all are flawed in one way or another. Ditto with several moment.js github threads. This was my crack at it:
getNumberOfWeeksInMonth = (momentDate) => {
const monthStartWeekNumber = momentDate.startOf('month').week();
const distinctWeeks = {
[monthStartWeekNumber]: true
};
let startOfMonth = momentDate.clone().startOf('month');
let endOfMonth = momentDate.clone().endOf('month');
// this is an 'inclusive' range -> iterates through all days of a month
for (let day = startOfMonth.clone(); !day.isAfter(endOfMonth); day.add(1, 'days')) {
distinctWeeks[day.week()] = true
}
return Object.keys(distinctWeeks).length;
}
function weeksInMonth(date = null){
let firstDay = moment(date).startOf('month');
let endDay = moment(date).endOf('month');
let weeks = [];
for (let i = firstDay.week(); i <= endDay.week(); i++){
weeks.push(i)
}
return weeks;
}
Here is a simple way of doing it (based on a solution posted above):
const calcWeeksInMonth = (momentDate) => {
const dateFirst = moment(momentDate).date(1)
const dateLast = moment(momentDate).date(momentDate.daysInMonth())
const startWeek = dateFirst.isoWeek()
const endWeek = dateLast.isoWeek()
if (endWeek < startWeek) {
// cater to end of year (dec/jan)
return dateFirst.weeksInYear() - startWeek + 1 + endWeek
} else {
return endWeek - startWeek + 1
}
}
As far as I can tell, it works correctly for any date thrown at it, but feedback is always welcome!
Throwing this into the mix
import moment from "moment";
export const calcWeeksInMonth = date => {
let weekMonthEnds = moment(date)
.date(moment(date).daysInMonth())
.week();
let weekMonthStarts = moment(date)
.date(1)
.week();
return weekMonthEnds < weekMonthStarts
? moment(date).isoWeeksInYear() - weekMonthStarts + 1
: weekMonthEnds - weekMonthStarts + 1;
};
var month = moment().month();
var startOfMonth = month.startOf("month");
var endOfMonth = month.endOf("month");
var startWeekNumber = startOfMonth.isoWeek();
var endWeekNumber = endOfMonth.isoWeek();
var numberOfWeeks = (endWeekNumber - startWeekNumber + 1);
console.log(numberOfWeeks);
If you have selectedDate value that is give you opportunity to detect which month is active now:
private calculateNumberOfWeeks(): number {
const end = moment(this.selectedDate).endOf('month');
const startDay = moment(this.selectedDate)
.startOf('month')
.day();
const endDay = end.day();
const endDate = end.date();
return (startDay - 1 + endDate + (endDay === 0 ? 0 : 7 - endDay)) / 7;
}
/UPDATE/
Solution below did not take in consideration jump to the new year.
Here is the improved solution.
const getNumberOfWeeksInAMonth = (currentMoment: moment.Moment) => {
const currentMomentCopy = cloneDeep(currentMoment)
const startOfMonth = currentMomentCopy.startOf('month')
const startOfISOWeek = startOfMonth.startOf('isoWeek')
let numberOfWeeks = 0;
do {
numberOfWeeks++
MomentManager.addWeek(startOfISOWeek)
} while (currentMoment.month() === startOfISOWeek.month())
return numberOfWeeks;
}
I have found another solution with momentjs.
const getNumberOfWeeksInMonth = (moment: moment.Moment) => {
const startWeek = moment.startOf('month').isoWeek()
const endWeek = moment.endOf('month').isoWeek()
return endWeek - startWeek + 1
}

Convert Date Format in JSON variable

I have a variable that contains JSON data with thousands of rows. Some of the variables are dates in the following format Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time). I need to convert all of these variables into a more usable date format such as `mm/dd/yyyy'.
Any suggestions on how to accomplish this?
{
"request": [
{ "startdate":"Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time)" ,
"status":"in progress" }, ...
]}
Thanks in advance!
You can pass the date string as an argument when instantiating the Date class. Javascript doesn't have a good date formatter, but you can easily roll your own. For instance:
function parseDate(date) {
var d = new Date(date);
var month = d.getMonth() + 1;
var day = d.getDate();
var year = d.getFullYear();
if(month < 10) month = '0' + month;
if(day < 10) day = '0' + day;
return month + '/' + day + '/' + year;
}
parseDate('Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time)');
// returns "06/27/2008"
Try the following:
var json = {
"request": [
{ "startdate":"Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time)" ,
"status":"in progress" }
]};
var date = new Date(json.request[0].startdate);
var formatDate = function(date) {
var mm = date.getMonth()+1;
mm = mm > 10 ? mm : "0"+mm;
var dd = date.getDate();
dd = dd > 10 ? dd : "0"+dd;
var yy = date.getFullYear();
return mm+"/"+dd+"/"+yy;
}
var formattedDate = formatDate(date);
Always best to convert a string to a date object is to manually parse it unless you have a very controlled environment. The following should do the job:
// Use date string to create a UTC time to pass to Date constructor
// Expected format is day mon year hh:mm:ss GMToffset (timezone name)
// e.g. Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time)
function parseDate(s) {
var months = {jan:0, feb:1, mar:2, apr:3, may:4, jun:5,
jul:6, aug:7, sep:8, oct:9, nov:10, dec:11};
var s = s.split(/[ :]/g);
var offset = s[7];
// Deal with offset
var sign = offset.indexOf('-') >= 0? -1 : 1;
var len = offset.length;
var offMins = sign * offset.substring(len-4, len-2) * 60 + sign * offset.substring(len-2, len);
var mins = s[4] - offMins;
return new Date(Date.UTC(s[3], months[s[1].toLowerCase()], s[2], s[4], mins, s[6]));
}
var s = 'Fri Jun 27 2008 00:00:00 GMT-0700 (US Mountain Standard Time)';
alert(parseDate(s)); //Fri 27 Jun 2008 17:00:00 GMT+1000
You can then format the date however you want:
function formatDateUS(d) {
function z(n){return (n<10? '0':'') + n}
return z(d.getMonth()+1) + '/' + z(d.getDate()) + '/' + d.getFullYear();
}
formatDateUS(parseDate(s)); // 06/27/2008

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