Benchmark: new Date().getTime() vs Date.now()

Tests:

new Date().getTime()
var x = new Date().getTime();
Date.now()
var x = Date.now();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1 Safari/605.1.15

Browser/OS: Safari 13 on Mac OS X 10.15.4

View result in a separate tab

Test name	Executions per second
new Date().getTime()	4671138.5 Ops/sec
Date.now()	4907316.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested:**

MeasureThat.net is testing two ways to get the current time in JavaScript: `Date.now()` and `new Date().getTime()`. The benchmark aims to determine which method is faster.

**Options compared:**

There are two options being compared:

1. **`Date.now()`**: This function returns the number of milliseconds since the Unix Epoch (January 1, 1970, 00:00:00 UTC) as an integer.
2. **`new Date().getTime()`**: This expression creates a new `Date` object and returns the timestamp (number of milliseconds since the Unix Epoch) of that date in milliseconds.

**Pros and Cons of each approach:**

* **`Date.now()`**:
	+ Pros: Simple, efficient, and widely supported.
	+ Cons: Returns the number of milliseconds since the Unix Epoch, which may not be what you want if you need to compare times in a specific context (e.g., relative to midnight).
* **`new Date().getTime()`**:
	+ Pros: Returns the timestamp of a specific date object, allowing for more flexibility when comparing times.
	+ Cons: Less efficient and less widely supported than `Date.now()`.

**Library used:**

None explicitly mentioned in the benchmark definition or test cases. However, it's likely that MeasureThat.net is using a JavaScript engine or browser implementation that provides these functions.

**Special JS feature/syntax:**

The benchmark uses no special JavaScript features or syntax beyond what is standard for JavaScript. No ES6+ features, async/await, or other advanced constructs are used.

**Other alternatives:**

If you need to compare times in JavaScript, other options might include:

1. **`performance.now()`**: This function returns the number of milliseconds since the performance measure started.
2. **`Date.prototype.getTime()`**: Some older browsers (e.g., Internet Explorer) may support this method for getting the timestamp.
3. **`Intl.DateTimeFormat().resolvedOptions().timeZone`**: This property is not well-supported across browsers and requires access to the local timezone.

In general, `Date.now()` remains a popular choice due to its simplicity and widespread support, but the best approach depends on your specific use case and requirements.

Related benchmarks:

new Date().getTime() vs Date.now() (version: 0)

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

Created: 4 years ago by: Registered User

Jump to the latest result

new Date().getTime()

Date.now()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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