Benchmark: new Date vs date.parse

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.17.1/moment.js"></script>

Tests:

Date.parse();
return Date.parse("2016-12-24 09:00:00");
new Date().getTime()
return new Date("2016-12-24 09:00:00").getTime();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date.parse();
new Date().getTime()

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Let's break down the benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**

The provided JSON represents a benchmark that compares two approaches:

1. `Date.parse()`
2. `new Date().getTime()`

**What are these approaches?**

* `Date.parse()` is a method that parses a date string in the format "YYYY-MM-DDTHH:mm:ss.sssZ" (where Z denotes UTC time zone). It returns the number of milliseconds since January 1, 1970, 00:00:00 UTC.
* `new Date().getTime()` creates a new `Date` object and returns the number of milliseconds since January 1, 1970, 00:00:00 UTC.

**Options compared**

The benchmark compares the execution performance of these two approaches. The test measures how many executions per second each approach can handle on the provided machine (Mac OS X 10.15.7, Chrome 90).

**Pros and Cons**

* `Date.parse()`:
	+ Pros: Can parse a wide range of date formats, including ISO 8601.
	+ Cons: May be slower due to its parsing logic.
* `new Date().getTime()`:
	+ Pros: Generally faster than `Date.parse()` since it's a direct access to the system clock.
	+ Cons: Only works with a specific date format (YYYY-MM-DDTHH:mm:ss.sssZ).

**Library usage**

The benchmark uses Moment.js, a popular JavaScript library for working with dates and times. It provides an efficient way to parse date strings.

**Special JS feature or syntax**

There are no special JS features or syntax used in this benchmark.

**Other alternatives**

Other approaches that could be compared include:

* Using `Date.now()` instead of `new Date().getTime()`
* Using a third-party library like date-fns or Luxon
* Using a custom implementation to parse the date string

Keep in mind that the choice of approach depends on the specific use case and performance requirements.

In this benchmark, `Date.parse()` is compared to `new Date().getTime()` because `Date.parse()` can handle a wider range of date formats, but may be slower due to its parsing logic. The goal is to determine which approach provides better performance in terms of executions per second.

Related benchmarks:

new Date vs date.parse (version: 0)

Comparing performance of: Date.parse(); vs new Date().getTime()

Created: 4 years ago by: Guest

Jump to the latest result

Date.parse();

new Date().getTime()

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):