How can I convert a normal date, like 2012.08.10, to a Unix timestamp in JavaScript?

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A direct approach is to use new Date() :

const dateString = "2012.08.10";
const date = new Date(dateString);
const timestamp = date.getTime() / 1000; // Convert milliseconds to seconds
console.log(timestamp); //

With the Unix timestamp (seconds), you can directly create a Date object from a date string and use getTime() to get the timestamp in milliseconds. Dividing by 1000 converts it to seconds, which is the typical Unix timestamp format.