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Can someone please explain how those lines code works? [closed]

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Can someone please explain how those lines code works?

setInterval() executes function over and over. This function:
Declares variable birthday with future date as a reference and
converts it to special format (milliseconds since UNIX epoch)
Declares variable now with current moment converted to same special
format.
Declares variable distance with difference between above two.
That is, distance holds milliseconds left to birthday.
Populates DOM elements (days, hours, minutes, seconds) with time left to birthday
When difference becomes zero, it populates DOM elements (headline) with "It's my birthday" text and makes it visible (sets its style attribute) and at the same time makes counter invisible.

it will continue running while the browser open, and will show :
It's my birthday
on 30 september 2021 at 00:00:00

display time and date in GMT or UTC [closed]

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I am trying to display GMT/UTC time with current date LIVE
i can display current time with it will be fixed until did refresh for the page
what i need to do display the time and date in UTC/GMT in my page as PHP or java code
thank you

If you want to convert your current time to another timezone lets say GMT or UTC then you can follow the following steps for javascript:
You can use moment-timezone lib.
const moment = require('moment-timezone')
const now = moment().format()
moment.tz(now, 'UTC').format()
moment.tz(now, 'GMT').format()

I'm going to make a time display using javascript with the following conditions, how can I do this? [closed]

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how do i make a time display using javascript with the following conditions below:
If the message is received today, only the "hour" will appear.
If the message is received yesterday, it will only appear yesterday and the hour.
If the message is received this week, it will only display the day and time.
If the message is received in this year, it will only appear date and month only without years.
if the message is received last year or previous year, it will appear date-month-year.
example :
08:00
Yesterday 08:00
Monday 08:00
23 Jul
23 Jul 2016

For something like this, I would highly recommend using Moment.js.
console.log(moment("20111031", "YYYYMMDD").fromNow()); // 7 years ago
console.log(moment("20120620", "YYYYMMDD").fromNow()); // 6 years ago
console.log(moment().startOf('day').fromNow()); // 8 minutes ago
console.log(moment().endOf('day').fromNow()); // in a day
console.log(moment().startOf('hour').fromNow());
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>
You can find more information here.

Generating random id using current date [closed]

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I'm doing a bank oriented project. I have to generate Account Number using current date.
Example:
account no-20150409001.
'2015'-Year,
'04'-Month,
'09'-Date,
'001'-represents the number of the new member opening the account on that particular date
This number should change in every branch to avoid same account number.
How to do so?
and this is my code
http://jsfiddle.net/Jegannath/z9na41o5/#&togetherjs=ynHxlyDeO1

If this is really a bank related project, do not rely on client side JavaScript for something as critical as the account number generation.
Is there a reason for the "random" number requirement? If not, stick with a sequence, it is a lot easier to ensure uniqueness.
On the server side, using a branch prefix as suggested by #kuldeep.kamboj should cover collision.
You can use something like yyyyMMddBBnnnn where yyyy = year, MM = month, dd = day, BB = branch number, and nnnn as a sequence that resets per day.

Not sure,this is correct advise,
Go with branch code prefix and timestamp in suffix, this might be developer friend also, because in future after 30 year easily you can tell his account created date with the help of timestamp.
As well timestamps is kind of random number.
advisable is server side code.

javascript count backwards 23 week days from current day for stock tracking [closed]

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I am working on an application to get historical stock data from yahoo finance csv api. I am having trouble creating a script that will get the current day and count back 23 weekdays (not counting weekends or holidays). The idea is that it will plug the two dates in at yahoo, get the historical data and then create a moving average. I am unsure how to do this using the date function though.

You could use the Moment.js library, if you are able to provide that to your page. You could use it to do something like this:
var today = moment();
var pastDate = today.subtract('days', 23);
// then do something with those two variables...
if you need them in a certain format before you pass them along, just call .format on them
getHistoricalData(today.format('YYYYMMDD'), pastDate.format('YYYYMMDD'));