How Can I Get a Timestamp in JavaScript?

Getting a Timestamp in JavaScript

Timestamping enables the generation of a unique numerical representation of a particular point in time. In JavaScript, several methods can be employed to obtain a timestamp.

Unix Timestamp (Seconds)

To acquire a timestamp in the Unix format, representing the number of seconds since the Unix epoch (January 1, 1970), utilize:

Math.floor(Date.now() / 1000)

Alternatively, for higher-speed execution, you can use:

Date.now() / 1000 | 0

Millisecond Timestamp (Precise)

For a timestamp with millisecond precision, employ:

Date.now()

Equivalent methods include:

+new Date()

new Date().valueOf()

Millisecond Timestamp (High Resolution)

To access a millisecond timestamp with improved resolution, utilize:

var timeStampInMs = (
    isPerformanceSupported ?
    window.performance.now() +
    window.performance.timing.navigationStart :
    Date.now()
);

where isPerformanceSupported is a boolean indicating support for performance profiling.

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