How JavaScript Handles Unix Timestamps: Milliseconds vs Seconds Explained

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JavaScript's Date.now() method returns the current time as a millisecond-based timestamp, which differs from the standard Unix timestamp format that uses seconds. To obtain a standard Unix timestamp in seconds, developers must divide Date.now() by 1000 and apply Math.floor() to remove decimals. Conversely, converting a Unix second-based timestamp back into a JavaScript Date object requires multiplying the value by 1000 before passing it to the Date constructor. A developer writing on DEV Community outlined these common conversions to help avoid confusion when working with time in JavaScript. They also shared a web tool called timestampeasy.com for quickly converting dates, timestamps, and timezones online.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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