logo
down
shadow

javascript - check if daylight time is in effect for different timezone


javascript - check if daylight time is in effect for different timezone

By : Francine Lin
Date : November 18 2020, 11:13 AM
To fix the issue you can do If you use moment.js and it's companion timezome script, they make checking for DST pretty easy:
Check out their docs for isDST()
code :
if( moment.tz("America/New_York").isDST() ){
    $('#test').append('NY is currently in DST');
}
else{
    $('#test').append('NY is NOT currently in DST');
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/moment.js/2.8.3/moment.min.js"></script>
<script src="http://momentjs.com/downloads/moment-timezone-with-data.min.js"></script>



<div id="test"></div>


Share : facebook icon twitter icon
Daylight savings time and JavaScript timezone conversions

Daylight savings time and JavaScript timezone conversions


By : wphsieh
Date : March 29 2020, 07:55 AM
it should still fix some issue http://www.datejs.com/
Javascript countdown and timezone and daylight saving time issues

Javascript countdown and timezone and daylight saving time issues


By : ajax andy
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I haven't dealt with the same scenarios personally, but seeing Date, timezone issues etc. pop up automatically triggers thoughts about some potential issues stemming from the use of local date objects as opposed to UTC date objects.
IMO, things are simply better off if all computation, serialization of dates only worked in the UTC space, and finally when it comes to present a date from a user, it is converted to local or appropriate time zone depending on the scenario. On the flip-side, the user enters local or some time zone relative entry, and immediately that is converted to UTC as the internal representation. This avoids all sorts of confusion across different layers/tiers of the app.
How to check if the DST (Daylight Saving Time) is in effect and if it is what's the offset?

How to check if the DST (Daylight Saving Time) is in effect and if it is what's the offset?


By : Alkshendra Kumar
Date : March 29 2020, 07:55 AM
hop of those help? This code uses the fact that getTimezoneOffset returns a greater value during Standard Time versus Daylight Saving Time (DST). Thus it determines the expected output during Standard Time, and it compares whether the output of the given date the same (Standard) or less (DST).
Note that getTimezoneOffset returns positive numbers of minutes for zones west of UTC, which are usually stated as negative hours (since they're "behind" UTC). For example, Los Angeles is UTC–8h Standard, UTC-7h DST. getTimezoneOffset returns 480 (positive 480 minutes) in December (winter, Standard Time), rather than -480. It returns negative numbers for the Eastern Hemisphere (such -600 for Sydney in winter, despite this being "ahead" (UTC+10h).
code :
Date.prototype.stdTimezoneOffset = function () {
    var jan = new Date(this.getFullYear(), 0, 1);
    var jul = new Date(this.getFullYear(), 6, 1);
    return Math.max(jan.getTimezoneOffset(), jul.getTimezoneOffset());
}

Date.prototype.isDstObserved = function () {
    return this.getTimezoneOffset() < this.stdTimezoneOffset();
}

var today = new Date();
if (today.isDstObserved()) { 
    alert ("Daylight saving time!");
}
JavaScript - Check for Daylight Saving for timezone

JavaScript - Check for Daylight Saving for timezone


By : user3313729
Date : March 29 2020, 07:55 AM
Any of those help Can you use a 3rd party library or does it have to be vanilla? If the former, try moment.js. Specifically: http://momentjs.com/docs/#/query/is-dst-shifted/
Check if Date is in Daylight Savings Time for Timezone Without pytz

Check if Date is in Daylight Savings Time for Timezone Without pytz


By : Clement J
Date : March 29 2020, 07:55 AM
To fix this issue In the general case this is a complex problem that is not amenable to a hand-rolled solution. Relying on an external module that is vetted and maintained by someone dedicated to the task, such as pytz, is the only sane option.
However given the constraint that you're only interested in U.S. time zones, Eastern in particular, it's possible to write a simple function. It is obviously only good for the current (2016) rules, which last changed in 2007 and might change again at any time. Those rules state that DST starts on the second Sunday in March and ends on the first Sunday in November.
code :
def is_dst(dt):
    if dt.year < 2007:
        raise ValueError()
    dst_start = datetime.datetime(dt.year, 3, 8, 2, 0)
    dst_start += datetime.timedelta(6 - dst_start.weekday())
    dst_end = datetime.datetime(dt.year, 11, 1, 2, 0)
    dst_end += datetime.timedelta(6 - dst_end.weekday())
    return dst_start <= dt < dst_end
Related Posts Related Posts :
  • How to change add and remove active class in JavaScript
  • how to toggle a specific div in javascript
  • How to get all the values from multiple keys of an array of object?
  • jQuery bind() unbind() and on() and off()
  • regular expression to find DD Month YYYY from a string
  • How to upload files from web client (HTML/jQuery form) to your Dropbox folder
  • Backbone history and require.js issue
  • Confusion over Classical and Prototypal Inheritance Javascript
  • How to take screen shot of current webpage using Javascript/JQuery?
  • Store meridiem in a variable
  • class declared inside closure vs standard class without closure
  • javascript confirm box always return true
  • dynamically changing the size of font size based on text length using css and html
  • Node.js - Getting the host IP address while on Amazon EC2
  • Confusing CSS, can anyone explain please
  • How to install v8-profiler on Windows 8 (64 bit) using npm?
  • Resolve promise based on another promise
  • google maps adding overlay layer above UI and markers
  • Style specific letter?
  • RangeError: Maximum call stack size exceeded with array.slice
  • node rest client get with local variable
  • If condition not executes while mouse move fastly
  • Count the number of displayed elements in a HTML list
  • Locate JavaScript source code in Emacs
  • Clean, Modular Code vs MV* Frameworks
  • infinite scroll without loading image
  • Backbone: reverse collection order with comparator
  • What do printers ignore?
  • jQuery UI .tabs() Contentless tab?
  • Execute Javascript alert() after page (visually) loaded
  • JavaScript - duplicating array doesn't work
  • Excessive clickable area below image
  • JavaScript Regex: Replace |b| with <b>
  • Unexpected value change in 2D array in JavaScript
  • Function doesnt see parameter as a array of objects
  • jQuery fetch keypress event on chrome and IE
  • How to enable jquery validate localization?
  • Cassandra map collection returned by node.js Helenus looks odd
  • angular ng-repeat with multiple filter options
  • Selecting Children without ID or Class names
  • How to uncheck a group of checkboxes when another checkbox is checked
  • Is hiding content by Javascript or jQuery Worth trying
  • Load XUL resource using javascript
  • XML to HTML text area from server file system
  • set focus() on textbox on form onload
  • es lint '' is assigned a value but never used' eventhough i have used it
  • Can "name" attribute be used for custom VueJS components
  • Get innerHTML of content when it is clicked
  • HTTPS causes CSS animations to not load? Very confused
  • How to hide other div apart from touched div to the band
  • Is global variable assignment atomic on NodeJS?
  • Datepicker onchangemonthyear beforeshowday
  • trying to render html files using jade but it still adresses it as a jade
  • Google Analytics - Understanding and Dissecting the Snippet: What is | | [ ];
  • Replacing "[aA09.b]." to "[aA09.b]\n" in in JavaScript
  • Why wrap a function definition in an immediate function?
  • Enable / disable jQuery script on switching to different tab in a HTML page
  • how can find return variable value outside anonymous function in node js mysql query function
  • Converting 1 to 0001 in javascript array
  • svg viewbox should not resize the text fontSize?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org