Benchmark: Date test - MeasureThat.net

Tests:

Date.now()
const date = Date.now()
new Date()
const date = new Date().getTime()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date.now()
new Date()

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**What is being tested?**

The provided JSON represents two individual test cases that compare different approaches to get the current date and time in JavaScript. The first test case uses `Date.now()`, while the second test case uses `new Date().getTime()`.

**Options compared:**

The two options being compared are:

1. **`Date.now()`**: This method returns the number of milliseconds since the Unix epoch (January 1, 1970, 00:00:00 UTC). It is a simple and efficient way to get the current timestamp.
2. **`new Date().getTime()`**: This method returns the number of milliseconds since the Unix epoch as well. However, it creates a new `Date` object, which can be slower than using `Date.now()`. The `Date` constructor takes into account time zones and daylight saving time (DST), whereas `Date.now()` does not.

**Pros and cons:**

* **`Date.now()`**:
	+ Pros:
		- Faster execution
		- More efficient
	+ Cons:
		- Does not take into account time zones or DST
		- May not work correctly in some environments (e.g., older browsers)
* **`new Date().getTime()`**:
	+ Pros:
		- Takes into account time zones and DST
		- Works consistently across different environments
	+ Cons:
		- Slower execution compared to `Date.now()`
		- Creates a new `Date` object, which can be memory-intensive

**Library and its purpose:**

None of the test cases use a specific library. However, it's worth noting that both methods rely on JavaScript's built-in `Date` class.

**Special JS feature or syntax:**

There are no special JS features or syntax used in these test cases.

**Other alternatives:**

If you need to get the current date and time in JavaScript, you might also consider using other approaches, such as:

* Using the `performance.now()` method, which returns the number of milliseconds since the performance timer was started.
* Using a library like Moment.js, which provides a more convenient and readable way to work with dates and times.

Here's an example of how you could write a benchmark for getting the current date and time using `performance.now()`:```javascript
const startTime = performance.now();
// your code here
console.log(`Current timestamp: ${performance.now() - startTime}ms`);
```

Keep in mind that `performance.now()` is only available in modern browsers that support Web Performance API.

I hope this explanation helps you understand what's being tested and the pros and cons of each approach!

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser/OS: Chrome 71 on Mac OS X 10.14.2

View result in a separate tab

Test name	Executions per second
Date.now()	3534068.2 Ops/sec
new Date()	2548167.8 Ops/sec

Related benchmarks:

Date test (version: 0)

Date test

Comparing performance of: Date.now() vs new Date()

Created: 5 years ago by: Guest

Jump to the latest result

Date.now()

new Date()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):