Why isn't date sort working across browsers? - reactjs

I am trying to implement a date-sorting method for a news list that works across browsers. However, the one method I have tried that works well, only works in Chrome:
origArt.sort(function(a, b) {
var dateA = new Date(a.date), dateB = new Date(b.date);
return dateB - dateA;
});
I also tried this code, suggested in other sorting questions as a possible solution:
origArt.sort(function(a,b){
return (b.date > a.date) ? 1 : (b.date < a.date) ? -1 : 0;
});
But, because the dates in my JSON vary from year; month & year; and month, year and day; the news list sorts in reverse
alphabetical order, not reverse chronological order.

They are strings such as: "2018.", "April 8, 2015.", and "September 2015."
Your problem is that those aren't valid date strings. From some quick testing, Chrome appears to be doing a bit of guesswork as to what you mean, but the other browsers aren't.
Chrome:
new Date("2018.")
// Mon Jan 01 2018 00:00:00 GMT-0800 (Pacific Standard Time)
Firefox:
new Date("2018.")
// Invalid Date
And since Invalid Date > Invalid Date is always false, it isn't sorting anything. It's not just a matter of removing the period either, since "September 2015" also works in Chrome but fails in Firefox.
Ideally, you should fix your JSON or whatever code it's being generated from to use parseable date strings. If that's not an option, you'll probably have to write a custom parsing function that handles all the possible formats you might get, or see if a library like Moment.js can handle it for you.

Related

How to parse current date without the time?

I'm trying to set up the current time of a process but I just want to set up the day not the time/seconds like Tue, 28 Sep 2021.
I know 2 ways of doing dates and that would be:
new Date().toTimezoneString() and firebase.firestore.FieldValue.serverTimestamp() both of them includes time though.
and I know that if I set up Date() alone it store the data as a date format instead of a string.
Extra: can it be set up in other languages as well ?
Use Intl ( Internationalization API ) to format your dates. It's supported by all browsers and provides a comprehensive api to suit your date and time formatting needs.
Here is the doc for the method you need:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DateTimeFormat/DateTimeFormat
For your use-case where you dont want to show time, you simply do not pass timeStype in the options parameter to the Intl formatter. Example would be
const date = new Date();
const formattedDate = new Intl.DateTimeFormat('en-US', { dateStyle: 'medium' }).format(date)

How to fix moment.js in reactjs?

I am using moment.js and getting this error:
Deprecation warning: value provided is not in a recognized RFC2822 or
ISO format. moment construction falls back to js Date(), which is not
reliable across all browsers and versions. Non RFC2822/ISO date
formats are discouraged and will be removed in an upcoming major
release. Please refer to
http://momentjs.com/guides/#/warnings/js-date/ for more info.
Arguments: [0] _isAMomentObject: true, _isUTC: false, _useU
In my react component I have:
const sortTasks = (first, second) => moment(first.endDate).diff(second.endDate);
The first.enddate=‘20 dec 2018’
How can I avoid this warning in the console?
One alternative is to inform moment.js about the date format used, by providing a second parameter to the moment function.
The format of "20 dec 2018" is DD MMM YYYY".
If you have both dates in the same format, you should write
const sortTasks = (first, second) =>
moment(first.endDate, "DD MMM YYYY").diff(moment(second.endDate, "DD MMM YYYY"));
Note that the other date is also explicitly transformed to a moment, since it is expressed in a non-standard format.
You can check the details in the moment.js documentation about parsing.
If you want to find out the difference expressed in days, or in e.g. years / months / days, you can use moment.duration. Check the moment.js documentation about this feature.
E.g. to obtain the number of years, months and days between two dates, say date1 and date2, we could proceed as follows (assuming date1 is before date2):
const theDuration = moment.duration(date2, date1);
const yearsElapsed = theDuration.years();
const monthsElapsed = theDuration.months();
const daysElapsed = theDuration.days();
Hope it helps - Carlos

'date' filter without time zone in angularjs

This is input format:
yyyy:MM:dd'T'HH:mm:ss'Z' (Coming as a string from json service)
Required output format:
dd-mmm-yyyy
I have tried with {{txnDate | date:'dd-mm-yyyy'}}
but it is not working..
What is the format you are following for your date?
A quick var a = new Date(); a.toISOString(); in console will give you something like "2015-02-19T13:30:13.347Z". The formatted string you are receiving is not following any standard and I am afraid parsing it to date will result in Invalid Date in most of the browsers.
So you can either
Get your Date in proper format.
Make the best use of whatever is available. You can use split to break your string into individual components.
Something like:
var a = "yyyy:MM:dd'T'HH:mm:ss'Z'" //Replace with actual string
b=a.split(':') will result in ["yyyy", "MM", "dd'T'HH", "mm", "ss'Z'"] giving you year and months in b[0] and b[1].
For date, you can use b[2].substring(0,2) to give you dd.
You have all date components(apart from time components, which you don't need anyway) as string.
Either use them directly(as a string) or make a date object using these components(since you want month in MMM format).
$scope.txnDate = new Date(b[0]+'/'+b[1]+'/'+b[2].substring(0,2));
I am sure there are more ways to optimize this. Comment if this doesn't work for you, will try to elaborate more.

Get week day in portuguese language from date in moment js

This is my code
$scope.getWeekDayShort = function(date) {
moment().locale('pt-br');
return moment(date, "D_M_YYYY").format('ddd');
}
it returns name of weekday in english but need portuguese weekday name
If I pass 1_1_2015 it returns Thu
How can I get weekday name in portuguese?
EDIT
moment.locale('pt-br');
console.log(JSON.stringify(moment.months())) // ["janeiro","fevereiro","março","abril","maio","junho","julho","agosto","setembro","outubro","novembro","dezembro"]
moment.locale('en');
console.log(JSON.stringify(moment.months())); // ["January","February","March","April","May","June","July","August","September","October","November","December"]
I have included moment-with-locales.min.js file which includes all supported language data and it work good with upper code. So why it not works with week name ?
Try this (source):
moment(date, "D_M_YYYY").locale('pt-br').format('ddd')
Might be worth it to log an issue on the GitHub page, I think your code should work or the docs should be improved.

Infragistics UltraCalendarCombo seems to be on drugs

I have an UltraCalendarCombo calendar control that I need to disable a set of dates in (weekends and public holidays basically).
I iterate through the list of dates for that month and set all the corresponding dates to disabled, this makes the current month look alright, but when I click the next month button on the control and try to access a month past now + 3 or 4 it jumps back to this month.
Has anyone any idea what this control is smoking, and where I can get some?
DateTimeCollection badDates = getMeSomeBadDatesmonth, year);
foreach (DateTime date in badDates)
{
myForm.CalendarInfo.DaysOfMonth[date.Day].Enabled = false;
}
Their controls have been going downhill for some time. I want to know what they are all smoking over there. I have been using their controls since the 2004 version of Net Advantage(which I really liked), but I have given up on using them on any new development. The bloat of features has broken what functionality did work and the documentation is just horrendous :(
Sorted it, the DaysOfMonth collection applies to a specific day (by number) of all months. For example, DaysOfMonth[10] applies to the tenth of every month of the year.
So I needed to use:
Infragistics.Win.UltraWinSchedule.Day theDay = _form.ValueDateCalInfo.GetDay(date, true);
if (theDay != null) theDay.Enabled = false;

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