JavaScript Dev

JavaScript Dev


A lightweight javascript timezone library

  • calculate time in remote timezones
  • support daylight savings, leap years, and hemispheres
  • Moment-like 💘 API (but immutable!)
  • Orient time by quarter, season, month, week…
  • Zero Dependencies - (no Intl API)
  • only 43KB.
<script src=""></script>
  var d = spacetime('March 1 2012', 'America/New_York')
  //set the time
  d = d.time('4:20pm')

  d = d.goto('America/Los_Angeles')

npm install spacetime

const spacetime = require('spacetime')
let d ='Europe/Paris')

Or with Typescript

import spacetime from 'spacetime'
let d =
//'Apr 1st, 4:32pm'

make sure to add this to your tsconfig.json:

  "compilerOptions": {
    "esModuleInterop": true

Demo     •     Full API



Date Inputs:

s = spacetime(1489520157124)

//array [yyyy, m, d] (zero-based months, 1-based days)
s = spacetime([2017, 5, 2])

s = spacetime('July 2, 2017 5:01:00')

// All inputs accept a timezone, as 2nd param:
s = spacetime(1489520157124, 'Canada/Pacific')
s = spacetime('2019/05/15', 'Canada/Pacific')

// or set the offset right in the date-string (ISO-8601)
s = spacetime('2017-04-03T08:00:00-0700')
// 'Etc/GMT-7'

// Some helpers
s =
s = // This morning
s = spacetime.tomorrow() // Tomorrow morning

Get & Set dates: // 14
s.year() // 2017
s.season() // Spring
s = s.hour(5) // Change to 5am
s = // Change to the 15th
s ='monday') // Change to (this week's) monday
s = s.month('march') // Change to (this year's) March 1st
s = s.quarter(2) // Change to April 1st
s.era() // 'BC'/'AD'
s.decade() // 2000
s.century() // 21

// Percentage-based information
s.progress().month = 0.23 // We're a quarter way through the month
s.progress().day = 0.48 // Almost noon
s.progress().hour = 0.99 // 59 minutes and 59 seconds

// Add/subtract methods
s = s.add(1, 'week')
s = s.add(3, 'quarters')
s = s.subtract(2, 'months').add(1, 'day')

// start-of/end-of
s = s.startOf('day') // 12:00am
s = s.startOf('month') // 12:00am, April 1st
s = s.endOf('quarter') // 11:59:59pm, June 30th

s = s.nearest('hour') //round up/down to the hour
s = s.nearest('quarter-hour') //5:15, 5:30, 5:45..
s ='month') //start of the next month
s = s.last('year') //start of the last year

// fill-in all dates between a range
s.every('week', 'Jan 1st 2020') // (in tz of starting-date)

s.clone() // Make a copy
s.isValid() // Sept 32nd → false
s.isAwake() // it's between 8am → 10pm
s.json() // get values in every unit as key-val object


let s = spacetime([2017, 5, 2])
let start = s.subtract(1, 'milliseconds')
let end = s.add(1, 'milliseconds')

// gt/lt/equals
s.isAfter(d) // True
s.isEqual(d) // False
s.isBefore(d) // False
s.isBetween(start, end, inclusive?) // True

// Comparison by unit
s.isSame(d, 'year') // True
s.isSame(d, 'date') // False
s.diff(d, 'day') // 5
s.diff(d, 'month') // 0

//make a human-readable diff
let before = spacetime([2018, 3, 28])
let now = spacetime([2017, 3, 28]) //one year later
/* {
    diff: {
      years: 0,
      months: 11,
      days: 30,
      hours: 23,
      minutes: 59,
      seconds: 59
    rounded: 'in 12 months',
    qualified: 'in almost 12 months',
    precise: 'in 11 months, 30 days'

it’s sometimes confusing how .diff() and .since() understand things:

spacetime('January 1 2017').diff('December 30 2016', 'year')
// returns 1
spacetime('January 1 2017').since('December 31 2016').diff
// returns {years:0, months:0, days:1}


// Roll into a new timezone, at the same moment
s = s.goto('Australia/Brisbane')

this is the safest way to declare a timezone, using an IANA name.

if you want to support more relaxed timezone names like 'EST', Eastern time, use spacetime-informal

s = s.goto('Jamaica') // "America/Jamaica"
s = s.goto('-7h') // UTC-7
s = s.goto('GMT+8') // -8h!
// (these should be used with some caution)
//list timezones by their \ time
spacetime.whereIts('8:30pm', '9:30pm') // ['America/Winnipeg', 'America/Yellowknife'... ]
spacetime.whereIts('9am') //(within this hour)

// Timezone metadata
s.timezone().name // 'Canada/Eastern' (either inferred or explicit)
s.hemisphere() // North
s.timezone().current.offset // -4 (in hours)
s.hasDST() // True
s.isDST() // True

//list all timezones

Date Formatting:

// Date + time formatting
s.format('time') // '5:01am'
s.format('numeric-uk') // 02/03/2017
s.format('month') // 'April'
s.format('month-short') // 'Apr'
s.format('month-pad') // '03'
s.format('iso-month') // '04'

//if you want more complex formats, use {}'s
s.format('{year}-{date-pad}-{month-pad}') // '2018-02-02'
s.format("{hour} o'clock") // '2 o'clock'
s.format('{time}{ampm} sharp') // '2:30pm sharp'

//if you prefer, you can also use unix-formatting
s.unixFmt('yyyy.MM.dd h:mm a') // '2017.Nov.16 11:34 AM'

Limitations & caveats

Historical timezone info

DST changes move around all the time, and timezones pop-in and out of existence. We store and use only the latest DST information, and apply it to historical dates.

DST changes within 1-hour

when very-close to a DST change, we can get the hour wrong, by 1.

This is a tricky order-of-operations issue.

To most people, DST changes occur during an unspecified time overnight, anyways.

International date line

.goto() never crosses the date-line. This is mostly the intuitive behaviour.

But if you’re in Fiji (just west of the date line), and you go to Midway (just east of the date line), .goto() will subtract a bunch of hours, instead of just adding one.

Destructive changes

if it’s 2:30pm and you add a month, it should still be 2:30pm. Some changes are more destructive than others. Many of thse choices are subjective, but also sensible.

0-based vs 1-based …

for better or worse we copy the JavaScript spec for 0-based months, and 1-based dates.

ISO-formatting is different, so keep on your toes.

see more considerations and gotchas


Ambiguity warnings:

javascript dates use millisecond-epochs, instead of second-epochs, like some other languages. This is a common bug, and spacetime can warn if you set an epoch within January 1970. to enable:

let s = spacetime(123456, 'UTC', {
  silent: false
s.log() // "Jan 1st, 12:02am"

There is another situation where you may see a console.warn - if you give it a timezone, but then set a ISO-date string with a different offset, like 2017-04-03T08:00:00-0700 (-7hrs UTC offset). It sets the timezone to UTC-7, but also gives a warning.

let s = spacetime('2017-04-03T08:00:00-0700', 'Canada/Eastern', {
  silent: false
s.timezone().name // "Etc/GMT-7"
Configure ‘today’ context:

spacetime makes some assumptions about some string inputs:

// assumes start of month
let s = spacetime('June 1992') // 1

// assumes current year
let s = spacetime('June 5th')
s.year() // 2020 (or whatever it is now)

// assumes Jan 1st
let s = spacetime('2030')
s.month() // 'January'

you can configure this assumed date (usually for testing) by passing it in as an option:

let today= {
  month: 3,
  date: 4,
  year: 1996,
let s = spacetime('June 5th', null, {today:today})
s.year() // 1996

it also works for, {today:today}) and others.


you can throw any methods onto the Spacetime class you want, with spacetime.extend():

  isHappyHour: function() {
    return this.hour() === 16

let s ='Australia/Adelaide')

s = s.time('4:30pm')
DD/MM/YYY interpretation:

by default spacetime uses the American interpretation of ambiguous date formats, like javascript does:

spacetime('12/01/2018') //dec 1st

// unless it's clear (>12):
spacetime('13/01/2018') //jan 13th

you can change this behaviour by passing in a dmy option, like this:

spacetime('12/01/2018', null, { dmy: true }) //jan 12th

this format is more common in britain, and south america.

Custom languages:
  days: {
    long: ['domingo', 'lunes', 'martes', 'miércoles', 'jueves', 'viernes', 'sábado'],
    short: ['dom', 'lun', 'mar', 'mié', 'jue', 'vie', 'sáb']
  months: {
    long: [...],
    short: ['ene', 'feb', 'mar', 'abr', 'may', 'jun', 'jul', 'ago', 'sep', 'oct', 'nov', 'dic'],
a.format('day') //'Sábado'
Configure start of week:

by default, the start of the week is monday.

You can determine the week by the official country setting, with spacetime-week

let s =
s = s.weekStart('sunday')

s = s.startOf('week')

s = s.endOf('week')

See also:

Thank you to the amazing

Download Details:

Author: spencermountain


Source Code:


What is GEEK

Buddha Community

A lightweight javascript timezone library

Rahul Jangid


What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


Advantages and Disadvantages of JavaScript

#javascript #javascript code #javascript hello world #what is javascript #who invented javascript

Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

Does your business need an interactive website or app?

Hire Dedicated JavaScript Developer from WebClues Infotech as the developer we offer is highly skilled and expert in what they do. Our developers are collaborative in nature and work with complete transparency with the customers.

The technology used to develop the overall app by the developers from WebClues Infotech is at par with the latest available technology.

Get your business app with JavaScript

For more inquiry click here

Book Free Interview:

#hire dedicated javascript developers #hire javascript developers #top javascript developers for hire #hire javascript developer #hire a freelancer for javascript developer #hire the best javascript developers

Mya  Lynch

Mya Lynch


Top 5 JavaScript Libraries to Create an Organizational Chart

In this article, we’ll review five JavaScript libraries that allow you to create online organizational charts. To make this info useful for different categories of readers, we’ve gathered together libraries with different functionality and pricing policy. To help you decide whether one of them is worthy of your attention or not, we’ll take a look at the main features and check if the documentation is user-friendly.

DHTMLX Diagram Library

The DHTMLX diagram library allows creating easily configurable graphs for visualization of hierarchical data. Besides org charts, you can create almost any type of hierarchical diagrams. You can choose from organizational charts, flowcharts, block and network diagrams, decision trees, mind maps, UML Class diagrams, mixed diagrams, and any other types of diagrams. This variety of diagrams can be generated using a built-in set of shapes or with the help of custom shapes.

You can set up any diagram shape you need with text, icons, images, and any other custom content via templates in a few lines of code. All these parameters can be later changed from the UI via the sidebar options in the editor.

Top 9 JavaScript Charting Libraries

The edit mode gives an opportunity to make changes on-the-fly without messing with the source code. An interactive interface of the editor supports drag-and-drop and permits you to change each item of your diagram. You can drag diagram items with your mouse and set the size and position property of an item via the editor. The multiselection feature can help to speed up your work in the editor, as it enables you to manipulate several shapes.

The library has an exporting feature. You can export your diagram to a PDF, PNG, or JSON format. Zooming and scrolling options will be useful in case you work with diagrams containing a big number of items. There is also a search feature that helps you to quickly find the necessary shape and make your work with complex diagrams even more convenient by expanding and collapsing shapes when necessary. To show the structure of an organization compactly, you can use the vertical mode.

The documentation page will appeal both to beginners and experienced developers. A well-written beginner’s guide contains the source code with explanations. A bunch of guides will help with further configuration, so you’ll be able to create a diagram that better suits your needs. At the moment, there are three types of licenses available. The commercial license for the team of five or fewer developers costs $599, the enterprise license goes for $1299 per company, and the ultimate license has a price tag of $2899.

#javascript #web dev #data visualization #libraries #web app development #front end development #javascript libraries #org chart creator

Niraj Kafle


The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Ajay Kapoor


JS Development Company India | JavaScript Development Services

PixelCrayons: Our JavaScript web development service offers you a feature-packed & dynamic web application that effectively caters to your business challenges and provide you the best RoI. Our JavaScript web development company works on all major frameworks & libraries like Angular, React, Nodejs, Vue.js, to name a few.

With 15+ years of domain expertise, we have successfully delivered 13800+ projects and have successfully garnered 6800+ happy customers with 97%+ client retention rate.

Looking for professional JavaScript web app development services? We provide custom JavaScript development services applying latest version frameworks and libraries to propel businesses to the next level. Our well-defined and manageable JS development processes are balanced between cost, time and quality along with clear communication.

Our JavaScript development companies offers you strict NDA, 100% money back guarantee and agile/DevOps approach.

#javascript development company #javascript development services #javascript web development #javascript development #javascript web development services #javascript web development company