JavaScript Date getTime() Method Last Updated : 12 Jul, 2024 Comments Improve Suggest changes Like Article Like Report JavaScript Date getTime() Method is used to return the number of milliseconds since 1 January 1970. When a new Date object is created it stores the date and time data when it is created. The getTime() always uses UTC for time representation.Syntax:Date.getTime();Parameters:This method does not accept any parameter.Return type:A numeric value equal to no of milliseconds since Unix Epoch.Example 1: Get time in millisecondsThis code demonstrates how to get the time in milliseconds from a Date object. It creates a Date object representing October 15, 1996, at 05:35:32. Then, it calls the getTime() method on the Date object to retrieve the time in milliseconds since January 1, 1970 (UNIX epoch). Finally, it logs the result to the console. JavaScript // Here a date has been assigned // While creating Date object let A = new Date('October 15, 1996 05:35:32'); // Hour from above is being // extracted using getTime() let B = A.getTime(); // Printing time in milliseconds. console.log(B) Output845357732000 Example 2: creating a Date object with an invalid date stringThe code attempts to create a Date object with an invalid date string ("October 35, 1996 12:35:32"). Since the date string is invalid (October doesn't have 35 days), the Date object creation will result in an invalid date. Consequently, getTime() will return NaN (Not-a-Number), which will be logged to the console. JavaScript // Creating a Date object let A = new Date('October 35, 1996 12:35:32'); let B = A.getTime(); // Printing hour. console.log(B); OutputNaN Example 3: Calculating user ageThe code calculates the age in years by subtracting the birth date (July 29, 1997) from the current date, both converted to milliseconds since the Unix epoch, and then dividing by the number of milliseconds in a year. Finally, it rounds the result using Math.round() and logs the age to the console. JavaScript let BD = new Date("July 29, 1997 23:15:20"); let Today = new Date(); let today = Today.getTime(); let bd = BD.getTime(); let year = 1000 * 60 * 60 * 24 * 365; let years = (today - bd) / year; console.log(Math.round(years)); Output27 Supported Browsers:Google ChromeMicrosoft Edge Mozilla FirefoxOpera Safari Comment More infoAdvertise with us P Pankaj_Singh Follow Improve Article Tags : JavaScript Web Technologies javascript-date JavaScript-Methods Similar Reads JavaScript Date() Constructor JavaScript Date constructor is used to create a new Date object. The value returned will be different on the basis of whether the object is called with or without the new keyword. If we call the object new keyword a Date object is created otherwise a string representing the current dat-time is retur 3 min read JavaScript Date constructor Property JavaScript Date constructor property returns the constructor function for an object. It is an ES1 feature and is supported by all browsers. 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