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Date.now() vs new Date().valueOf()
(version: 0)
Comparing performance of:
Date.now() vs new Date().valueOf()
Created:
5 years ago
by:
Guest
Go to the latest result
Script Preparation code:
let timestamp = null
Tests:
Date.now()
timestamp = Date.now()
new Date().valueOf()
timestamp = new Date().valueOf()
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Date.now()
new Date().valueOf()
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Browser/OS:
Chrome 121 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=516152" width="100%" height="500px"></iframe>
Date.now()
3.0M/s
new Date().valueOf()
2.6M/s
View exact numbers
Test name
Executions per second
✓
Date.now()
2,959,890 Ops/sec
new Date().valueOf()
2,575,824 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **What is being tested?** The benchmark is comparing two ways to get the current timestamp in JavaScript: `Date.now()` and `new Date().valueOf()`. The goal is to determine which method is faster, more efficient, or both. **Options compared** There are two options being compared: 1. **`Date.now()`**: This method returns the number of milliseconds since the Unix epoch (January 1, 1970, 00:00:00 UTC). It's a simple and efficient way to get the current timestamp. 2. **`new Date().valueOf()`**: This method returns the number of milliseconds since the Unix epoch, but it's slightly more complex because it creates a new `Date` object and then calls its `valueOf()` method. **Pros and Cons** * **`Date.now()`**: + Pros: Fast, simple, and widely supported. + Cons: May not be as precise as other methods (e.g., `performance.now()`) due to system clock resolution limitations. * **`new Date().valueOf()`**: + Pros: More accurate than `Date.now()` because it creates a new date object with the current timestamp, which can help reduce jitter and noise in the result. + Cons: Slightly slower and more complex than `Date.now()`. **Library/Features used** * **`Date` object**: This is a built-in JavaScript object that represents a specific point in time. The `Date.now()` method uses this object to get the current timestamp. * **`performance.now()`**: Although not explicitly mentioned, it's worth noting that `performance.now()` also returns the number of milliseconds since the Unix epoch and is often used for high-performance timing measurements. However, its presence is not required in this specific benchmark. **Special JS feature** None of the code snippets use any special JavaScript features or syntax. **Other alternatives** If you want to compare other methods for getting the current timestamp in JavaScript, some alternative approaches include: * **`new Date().getTime()`**: Similar to `new Date().valueOf()`, but uses the `getTime()` method instead. * **`performance.now()`**: As mentioned earlier, this method returns the number of milliseconds since the Unix epoch and is often used for high-performance timing measurements. * **`Date.now()` with some optimizations**: Some browsers and JavaScript engines offer optimization options for `Date.now()`, such as using a cached timestamp or reducing the resolution. Keep in mind that these alternatives might not be part of the standard JavaScript API, and their usage may require specific browser or engine support.
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Date.now() vs new Date()
Date valueOf() vs Date.now()
Date.now() - Date.now() vs new Date() - new Date()
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