How to convert Timestamp to Milliseconds in JavaScript?
To convert a timestamp to milliseconds in JavaScript, utilize the `getTime()` method on a `Date` object. This method provides the milliseconds since January 1, 1970. You can also use the `Date.parse()` method to directly convert a timestamp to milliseconds by inputting a date string. This method returns the milliseconds since January 1, 1970, allowing for quick access to the milliseconds value for calculations or manipulations.