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Front End Technology Articles
Page 521 of 652
How to get time difference between two timestamps in seconds?
To get the time difference between two timestamps, try to run the following code. Here, we are calculating the total number of hours, minutes and seconds between two timestamps −ExampleLive Demo JavaScript Dates var date1, date2; date1 = new Date( "Jan 1, 2018 11:10:05" ); document.write(""+date1); date2 = new Date( "Jan 1, 2018 08:15:10" ); document.write(""+date2); var res ...
Read MoreHow to convert a Unix timestamp to time in JavaScript?
To convert a Unix timestamp to time, you can try to run the following code in JavaScript −ExampleLive Demo JavaScript Dates var unix_time = 1514791901 ; var date = new Date(unix_time*1000); // get hours var hrs = date.getHours(); // get minutes var min = "0" + date.getMinutes(); // get seconds var sec = "0" + date.getSeconds(); document.write("Time- "+hrs + ":" + min.substr(-2) + ":" + sec.substr(-2)); OutputTime- 13:01:41
Read MoreHow to get current date/time in seconds in JavaScript?
To convert time in seconds, firstly get the current time. Then, multiply the hours to 3600 and minutes to 60; rest you can see below −(hours*3600) + (min*60) + secExampleYou can try to run the following code to get the current time in seconds −Live Demo JavaScript Get Seconds var dt = new Date(); var sec = dt.getSeconds(); document.write("Seconds: " + sec); var min = dt.getMinutes(); document.write("Minutes: " + min); var hrs = dt.getHours(); document.write("Hours: " + hrs); var total_seconds = (hrs*3600) + (min*60) + sec; document.write("Total seconds: " + total_seconds) ; OutputSeconds: 35 Minutes: 37 Hours: 9 Total seconds: 34655
Read MoreHow to compare two JavaScript Date Objects?
To compare two date objects with JavaScript, create two dates object and get the recent date to compare it with the custom date.ExampleYou can try to run the following code to compare two dates −Live Demo var date1, date2; date1 = new Date(); document.write(date1); date2 = new Date( "Dec 10, 2015 20:15:10" ); document.write(""+date2); if (date1 > date2) { document.write("Date1 is the recent date."); } else { document.write("Date 2 is the recent date."); } OutputMon May 28 2018 09:48:49 GMT+0530 (India Standard Time) Thu Dec 10 2015 20:15:10 GMT+0530 (India Standard Time) Date1 is the recent date
Read MoreWhat is the best way to initialize a JavaScript Date to midnight?
To initialize a JavaScript Date to midnight, set hours like the following −setHours(0,0,0,0);ExampleYou can try to run the following code to set a date to midnight −Live Demo var dt; dt = new Date(); dt.setHours(0,0,0,0); document.write(dt); OutputMon May 28 2018 00:00:00 GMT+0530 (India Standard Time)
Read MoreHTML DOM Geolocation position property
The HTML DOM Geolocation coordinates property is used for getting a user’s device position and altitude on earth. The user have to approve that he/she wants to give coordinates before this property could work. This is done so that users privacy isn’t compromised. This can be used for tracking various devices location.PropertiesFollowing is the position property −Note − The below properties are read-only −PropertyDescriptionposition.coordsTo return a coordinates object having information like latitude, longitude, altitude, and speed of the device on the earth. It also has an accuracy value describing how accurate the measurements are in meters.position.timestampTo representing the time and ...
Read MoreHow to get Natural logarithm of 2 in JavaScript?
To get the Natural logarithm of 2, use the Math.LN2 property in JavaScript. It returns the natural logarithm of 2, which is approximately 0.693.ExampleYou can try to run the following code to get Natural logarithm of 2 −Live Demo JavaScript Math LN2 Property var property_value = Math.LN2 document.write("Property Value is : " + property_value); OutputProperty Value is : 0.6931471805599453
Read MoreHow to get Euler's constant value in JavaScript?
To get Euler’s constant value in JavaScript, use the Math E property. This is a Euler's constant and the base of natural logarithms, approximately 2.718.ExampleYou can try to run the following code to get Euler’s constant value in JavaScript −Live Demo JavaScript Math E Property var property_value = Math.E document.write("Property Value is :" + property_value); OutputProperty Value is :2.718281828459045
Read MoreHow to get the difference between two arrays in JavaScript?
To get the difference between two arrays in JavaScript, try to run the following code. Here, we’re using some method like split(), indexOf(), sort(), etc to get the elements, which aren’t the same in both the arrays &mnus;ExampleLive Demo JavaScript Dates function arrDifference (arr1, arr2) { var arr = []; arr1 = arr1.toString().split(', ').map(Number); arr2 = arr2.toString().split(', ').map(Number); // ...
Read MoreHow to preselect a value in a dropdown list of items in HTML forms?
With HTML, you can easily create a simple drop down list of items to get user input in HTML forms. A select box also called drop down box provides an option to list down various options in the form of drop down list.You can also preselect a value in dropdown list of items in HTML forms. For that, add selected in the tag for the value you want to preselect.ExampleYou can try to run the following code to learn how to preselect value in a dropdown list of items works in HTML form −Live Demo ...
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