Develop Reference

Get dates list between 2 dates (fromDate and toDate) in utc time using angular7

I have try to get dates list between two date using JavaScript (I have already achieved in GMT).
Example:
fromDate - 2019-08-27
toDate - 2019-08-30
Date list
[2019-08-27, 2019-08-28, 2019-08-29, 2019-08-30]
I have already got this array using this following JavaScript
if(result.data.closurPeriods.length > 0) {
result.data.closurPeriods.forEach(closure => {
var start = closure.fromDate, //closure.fromDate = 2019-08-27
end = new Date(closure.toDate), //closure.toDate = 2019-08-30
currentDate = new Date(start);
while (currentDate <= end) {
this.closurPeriods.push(this.datePipe.transform(new Date(currentDate), 'yyyy-MM-dd'));
currentDate.setDate(currentDate.getDate() + 1);
}
});
}
The above JavaScript is working for only GTM and localtime(India). When I try to run this script in USA the date list array like this
[2019-08-28, 2019-08-28, 2019-08-29]
Because of UTC not accept this script.
My question is how to solve this above script in UTC

2019-08-27 is parsed as UTC, but getDate and setDate are local. The USA is west of Greenwich, so new Date('2019-08-27') produces a local date for 2019-08-26, adding a day makes it 2019-08-27.
The same thing will happen for any timezone that has a negative offset.
A simple fix is to use all UTC, e.g.:
function fillRange(start, end) {
let result = [start];
let a = new Date(start);
let b = new Date(end);
while (a < b) {
a.setUTCDate(a.getUTCDate() + 1);
result.push(a.toISOString().substr(0,10));
}
return result;
}
let from = '2019-08-27';
let to = '2019-08-30';
console.log(fillRange(from, to));
However, I'd advise explicitly parsing the date and not to use the built–in parser. A simple parse function is 2 or 3 lines of code, or you can use one of many parsing and formatting libraries.

Finally i got the solutions
var start = new Date(closure.fromDate); // 2019-07-27
var end = new Date(closure.toDate); // 2019-07-31
var currentDate = start;
while (currentDate <= end) {
//this.closurPeriods.push(this.datePipe.transform(new Date(currentDate), 'yyyy-MM-dd'));
var date = new Date(currentDate);
var datewithouttimezone = new Date(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate());
this.closurPeriods.push(this.datePipe.transform(new Date(datewithouttimezone), 'yyyy-MM-dd'));
currentDate.setDate(currentDate.getDate() + 1);
}
Or
var start = new Date(closure.fromDate); // 2019-07-27
var end = new Date(closure.toDate); // 2019-07-31
var currentDate = start;
while (start < end) {
start.setUTCDate(start.getUTCDate() + 1);
this.closurPeriods.push(start.toISOString().substr(0, 10));
}

Moment not returning date range

I am trying to create a date array between 2 dates.
[11/16/2018, 12/16/2018, 1/16/2019......11/16/2019]
I have the following code.
function dateRange(stDate, etDate) {
const dates = [];
var startDate = moment(new Date(stDate)).format("MM/DD/YYYY");
var endDate = moment(new Date(etDate)).format("MM/DD/YYYY");
var now = new Date(startDate);
while (startDate <= endDate) {
dates.push(new Date(now));
now = now.addMonths(1);
}
console.log("dateRange " + dates);
}
function RunLedgerAndPV() {
var stDate = "11/16/2018";
var etDate = "11/16/2019";
dateRange(stDate, etDate);
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>
Trying to debug it, it doesn't break or anything and it is returning the just the start and end date but doesn't push the date array. What am i doing wrong here?
Also, i have looked at the other posts regarding this and i have myself worked on date range in the past. However, i am clueless as to why this isn't working for me.
Any help is appreciated. Thank you!

There are quite a few inefficiencies and bugs in your code, too many to list really. A summary would include unnecessary creation and then re-stringifying of dates, unnecessary use of JS Date constructors and dodgy logic in your for loop.
Here's a version which will work correctly using just momentJS functionality:
function createLedger(stDate, etDate) {
if (stDate && etDate) {
var endOfLeaseDate = moment(etDate, "MM/DD/YYYY");
var startOfLeaseDate = moment(stDate, "MM/DD/YYYY");
dateRange(startOfLeaseDate, endOfLeaseDate);
}
}
function dateRange(stDate, etDate) {
var dates = [];
var now = stDate.clone();
var day = stDate.date();
while(now.isBefore(etDate)) {
//deal with variable month end days
var monthEnd = now.clone().endOf("month");
if (now.date() < day && day <= monthEnd.date()) { now.date(day); }
dates.push(now.format("YYYY-MM-DD"));
now = now.clone().add({ "months" : 1 });
}
console.log(dates);
}
function RunLedgerAndPV() {
var stDate = "12/31/2018";
var etDate = "12/31/2019";
createLedger(stDate, etDate);
}
RunLedgerAndPV();
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>

for (var i=0; now <= endDate; i++) {
dates.push(new Date(now));
now = now.addMonths(1);
}
you instantiate and use i in order to loop through nothing. the condition now <= endDate is in no way affected by the value of i ( typically you increment / decrement i until it reaches the desired value as : var i=0; i < 11; i++ ) i dont event know how this would work, my first instinct is that it will generate a loop that wont stop until until we reach that endDate date.
You seems to be looking for getting all the date between a specific range, try the following :
var enumerateDaysBetweenDates = function(startDate, endDate) {
var dates = [];
var currDate = moment(startDate, 'MM/DD/YYYY');;
var lastDate = moment(endDate, 'MM/DD/YYYY');;
while(currDate.add(1, 'months').diff(lastDate) < 0) {
console.log(currDate.toDate());
dates.push(currDate.clone().toDate());
}
return dates;
};

Sorting JSON object in javascript by date (String)

I have a JSON object in JavaScript and I am trying to sort the object in order by dates.
fileListObj[id] = date;
output : "#HIDDEN ID": "16/12/2013"
How can I sort the object to be in order by most recent date?
I only know how to do this in php

include moment.js
fileListObj.sort(function(a,b) {
return moment(b, 'DD/MM/YYYY').valueOf() - moment(a, 'DD/MM/YYYY').valueOf();
})

First you'll want to write/get a date parser. Using Javascript's native Date object is unreliable for parsing raw strings.
Then you'll want to use Array.prototype.sort():
function parseDate(input) {
var parts = input.split('/');
return new Date(parts[2], parts[1]-1, parts[0]);
}
function sortAsc(a,b)
{ return parseDate(a.date) > parseDate(b.date); }
function sortDesc(a,b)
{ return parseDate(a.date) < parseDate(b.date); }
list.sort(sortAsc);

Here's a working example, the sorted table will contain ISO format dates
var dates = ["12/05/2012", "09/06/2011","09/11/2012"]
var sorted=[];
for(var i=0, i= dates.length;i++){
var p = dates[i].split(/\D+/g);
sorted[i]= new Date(p[2],p[1],p[0]);
}
alert(sorted.sort(function(a,b){return b-a}).join("\n"));
To get the same input format you can use this function:
function formatDate(d)
{
date = new Date(d)
var dd = date.getDate();
var mm = date.getMonth()+1;
var yyyy = date.getFullYear();
if(dd<10){dd='0'+dd}
if(mm<10){mm='0'+mm};
return d = dd+'/'+mm+'/'+yyyy
}
sorted.sort(function(a,b){return b-a})
formatSorted = []
for(var i=0; i<sorted.length; i++)
{
formatSorted.push(formatDate(sorted[i]))
}
alert(formatSorted.join("\n"));

If date between date range

I'm working with two dates, e.g. 29/03/2014 and 04/04/2014, and I have an array of dates e.g. 01/04/2014 and 02/04/2014, I need to find out how many (if any) dates in that array are between the date range.
What's the best way to do this?
EDIT: Final code, tweaked a little from ponciste's answer
//date1 and date2 are the start/end dates
bhDays = new Array();
$.each(DataBridge.bankHolidays, function(i, v) {
var americanDate = v.split('-');
americanDate = americanDate[1] + '/' + americanDate[0] + '/' + americanDate[2];
date = new Date(americanDate);
if (date1 <= date && date2 >= date) {
bhDays.push(date);
}
});

it's better to deal with Date object in this case
so your code should be something like this:
var strDateFrom = "29/03/2014";
var strDateTo = "04/04/2014";
var dateFrom = strDateFrom.split("/");
var dateTo = strDateTo.split("/");
var dates = ["01/04/2014", "02/04/2014"];
var from = new Date(dateFrom[2], dateFrom[1]-1, dateFrom[0]);
var to = new Date(dateTo[2], dateTo[1]-1, dateTo[0]);
dates.forEach(function(date) {
var dateToCheck = new Date(date[2], date[1]-1, date[0]);
if(dateToCheck > from && dateToCheck < to)
});

The Date object will do what you want - construct one for each date, then just compare them using the usual operators.
Construct your date objects and compare using < || > operators.

I strongly reccoment to use moment.js library for that (and all other operations with date/time) and use difference function.

comparing dates in JavaScript using moment with langs

I have two dates namely newdate and haha. newdate will be today's date (current date) and haha date can be any.The below code is not working for me as i have provided
newdate : 07-Feb-2014 10:04
haha :03-Feb-2014 00:00
its always coming to else part
sdate:03-Feb-2014
stime :00:00
var haha=sdate+" "+stime;
var newdate=new Date();
var date_str = moment(newdate).format("DD-MMM-YYYY HH:mm");
alert(date_str);
if (Date.parse(haha) < Date.parse(date_str)) {
alert("Start date cannot be less than today's date");
return false;
}
else {
alert("hahahhahaha");
}
NOTE I am using moment with langs javscript

Your Code Works. Stime is formatted wrong remove the colon from in front of the first set of 00. stime 00:00. How are you generating stime this is the cause of you problem?
You can see my test here.
var sdate = "03-Feb-2014";
var stime = "00:00";
var haha = sdate + " " + stime;
var newdate = new Date();
if (navigator.appName.indexOf("Internet Explorer") != -1) {
alert("isIE");
var dateObject = (parseISO8601(haha));
var hahaDate = new Date(dateObject.year, dateObject.month, dateObject.day, dateObject.hour, dateObject.min);
alert(hahaDate);
if (hahaDate.getTime() < newdate.getTime()) {
alert("Start date cannot be less than today's date");
return false;
} else {
alert("hahahhahaha");
}
} else {
var date_str = moment(newdate).format("DD-MMM-YYYY HH:mm");
alert(date_str);
if (Date.parse(haha) < Date.parse(date_str)) {
alert("Start date cannot be less than today's date");
return false;
} else {
alert("hahahhahaha");
}
}
function parseISO8601(dateStringInRange) {
var dateAsObject = {};
var splitTimeFromDate = dateStringInRange.split(" ");
var splitTimeValues = splitTimeFromDate[1].split(":");
dateAsObject.hour = splitTimeValues[0];
dateAsObject.min = splitTimeValues[1];
var splitDate = splitTimeFromDate[0].split("-");
dateAsObject.year = splitDate[2];
dateAsObject.day = splitDate[0];
dateAsObject.month = monthToNum(splitDate[1]);
return dateAsObject;
}
function monthToNum(month) {
if (month == "Feb") return 1;
}
[Edit: Ok sorry I messed up with the Colon, If it fails at the else are you sure you unit tests include enough scenario to were the date is both greater than and less than the current date if it is only less than like your example you will never hit the code in the else. Again the code just works don't know what to say :-(, update example for both situations]
[Edit: Here is an example not complete you have to remember javascript is not universal. When you ask a question about JS assume as DEVs we all use Chrome or FF, or atleast post the browser(s) you tired. I provided a simple example of how I would accomplish this. Frankly I don't like external framework when I can do it myself so as you can see I am not using it feel free to do what you want the issue is cause by the way IE Parses DateTime you must use a more universal format like the one provided below. Example of possible formats: http://www.w3schools.com/jsref/jsref_obj_date.asp. Anyhow GL]

That is a bit convoluted, consider:
var newdate = new Date();
var date_str = moment(newdate).format("DD-MMM-YYYY HH:mm");
Date.parse(date_str);
if the above works (and there is absolutely no guarantee that Date.parse will correctly parse the string in all browsers in use), then all of that is equivalent to:
var newdate = new Date();
newdate.setSeconds(0, 0);
You would do very much better to manualy parse haha (or use moment.js since you have it already) and compare the resultant date objects.
Consider:
// s is dd-mmm-yyyy hh:mm
function stringToDate(s) {
s = s.split(/[- :]/);
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};
return new Date(s[2], months[s[1].toLowerCase()], s[0], s[3], s[4], 0, 0);
}
var newdate = '07-Feb-2014 10:04';
var haha = '03-Feb-2014 00:00';
alert(stringToDate(newdate).getTime() == stringToDate(haha).getTime()); // false
// Set to same time
var newdate = '03-Feb-2014 00:00';
alert(stringToDate(newdate).getTime() == stringToDate(haha).getTime()); // true