Javascript time converter how to#

Mouse Events Basics Moving the mouse: mouseover/out, mouseenter/leave Drag and Drop with JavaScript Keyboard: keydown and keyup Scrollingįorm Properties and Methods Focusing: focus/blur Events: change, input, cut, copy, paste Forms: event and method submit JavaScript Introduction to Browser Events Bubbling and Capturing Event Delegation Browser Default Actions Dispatching Custom Events Popups and Window Methods Cross-window CommunicationĪrrayBuffer, Binary Arrays TextDecoder and TextEncoder Blob File and FileReaderīrowser Environment, Specs Searching:getElement*, querySelector* Node Properties:Type, Tag and Contents Attributes and Properties Modifying the document Styles and Classes Window Sizes and Scrolling Coordinates Modules Export and Import Dynamic Imports Generators Async Iterators and Generators Introduction:callbacks Promise Promise Chaining Error Handling with Promises Promise API Promisification Microtasks Async/await Prototypal inheritance F.prototype Native Prototypes Prototype Methods, Objects WithoĬlass Basic Syntax Class inheritance Static properties and methods Private and Protected Properties Extending Built-in Classes Class Checking: “instanceof” MixinsĮrror handling, 'try.catch' Custom Errors, Extending Error Property Flags and Descriptors Property Getters and Setters Recursion and Stack Rest Parameters and Spread Synta Variable scope The Old “var” ‌‌Global‌ ‌Object‌ ‌ Function object, NFE The “new function” Syntax setTimeout and setInterval Decorators and forwarding, call/apply Function Binding Arrow functions revisited Methods of primitives Numbers Math Strings Arrays Array methods Iterables Map and Set WeakMap and WeakSet Object.keys, Values, Entries Destructuring Assignment Date and time JSON methods, toJSON Objects Object methods, 'this' Garbage collection Symbol Types Object to Primitive Conversion Constructor, operator 'new' UTC offset (in hours).Introduction Start using Javascript Comments Javascript with DOM JavaScript Use Strict Variables Data Types Simple Actions Operators Comparison operators Logical Operators Conditional operators: if, '?' Switch Loops Functions Function Expressions Arrow Functions Here, the calcTime ( ) function accepts a city name and its Return “The local time in ” + city + ” is ” + nd.toLocaleString() create new Date object for different city Utc = d.getTime() + (d.getTimezoneOffset() * 60000) Take a look at this next script ( ListingĪ), which ties it all together by creating a compact, user-defined calcTime ( ) function to perform all theseĬalculations and return a time value: Listing A Previous step to a human-readable date/time string by initializing a new Date( ) object with it, and calling theĭocument.writeln(“Bombay time is ” + nd.toLocaleString() + “”) So we need to make a few more calculations. Therefore, converting hours to milliseconds involves multiplying by 3600 * 1000Īt this point, the variable bombay contains the Remember that 1000 millseconds = 1 second, and 1 hour You’re wondering how I arrived at 3600000 as the multiplication factor, obtain and add destination’s UTC time offset The destination city’s UTC offset in hours, convert it to milliseconds and add Keep it like this for the moment, because thereĪre still a few more calculations to perform. However, this time value is expressed as the number of The local time zone offset to the local time.Īt this point, the variable utc contains theĬurrent UTC time. Therefore,Ĭonverting minutes to milliseconds involves multiplying by 60 * 1000 = 60000. That 1000 milliseconds = 1 second, and 1 minute = 60 seconds. You’re wondering how I arrived at 60000 as the multiplication factor, remember Note that a negative return value from getTimezoneOffset ( ) indicates that the current location isĪhead of UTC, while a positive value indicates that the location is behind UTC. LocalOffset = d.getTimezoneOffset() * 60000

Returns the time zone offset in minutes, so convert this value to milliseconds With the Date( ) object’s getTimezoneOffset () method. 1, 1970, by invoking the Date( )object’s getTime () method: create Date object for current location In JavaScript, this is easily accomplished by

Javascript time converter how to#

This document explains how to go about performing these calculations. Perform various temporal calculations and convert local time to destination The time in a different location – for example, if your base is in a differentĬountry and you want to see “home” time instead of local time? Page, by directly reading the client’s clock. To display the time of day of a different time zone from the local time zone on a Web page it is necessary to perform various temporal calculations and convert local time to destination time.Īs you no doubt know, JavaScript makes it easy to display the local time on a Web Convert the local time to another time zone with this JavaScript