Toggle navigation
MeasureThat
.net
Create a benchmark
Tools
Feedback
Feature Requests
FAQ
Register
Log In
Date.now() - Date.now() vs new Date() - new Date()
(version: 0)
Benchmark.js
Comparing performance of:
Date.now() vs new Date().getTime();
Created:
3 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var timedif = null;
Tests:
Date.now()
timedif = Date.now() - Date.now();
new Date().getTime();
timedif = new Date() - new Date();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
Date.now()
new Date().getTime();
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Browser/OS:
Firefox 134 on Windows
View result in a separate tab
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=589024" width="100%" height="500px"></iframe>
Date.now()
5.5M/s
new Date().getTime();
2.4M/s
View exact numbers
Test name
Executions per second
✓
Date.now()
5,486,806 Ops/sec
new Date().getTime();
2,385,764 Ops/sec
Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into what this benchmark is testing. **Benchmark Definition** The benchmark is called "Date.now() - Date.now() vs new Date() - new Date()" and it's comparing the performance of two approaches to measure time differences using JavaScript's built-in `Date` object. **Individual Test Cases** There are two test cases: 1. **"Date.now()"** * Benchmark Definition: `timedif = Date.now() - Date.now();` * This test case measures the time difference by subtracting the current timestamp (`Date.now()`) from itself. 2. **"new Date().getTime()"** * Benchmark Definition: `timedif = new Date() - new Date();` * This test case measures the time difference by creating two separate `Date` objects using `new Date()` and then subtracting their respective timestamps. **Library/Feature Used** In this benchmark, the only library or feature used is JavaScript's built-in `Date` object. There are no external libraries or special syntax involved. **Pros/Cons of Different Approaches** The two approaches being compared have different characteristics: 1. **"Date.now()"** * Pros: + Simpler and more concise code + Only involves a single function call (`Date.now()`) * Cons: + May be less accurate due to the nature of subtracting identical values 2. **"new Date().getTime()"** * Pros: + More accurate measurement, as it creates two separate `Date` objects with distinct timestamps * Cons: + Slightly more complex code, involving two function calls (`new Date()`) **Other Considerations** When choosing between these approaches, consider the specific use case: * If you need a quick and simple way to measure time differences for debugging or logging purposes, using `Date.now() - Date.now()` might be sufficient. * For more accurate measurements or when precision matters (e.g., in performance-critical code), using `new Date().getTime() - new Date().getTime()` is generally recommended. **Other Alternatives** If you need to measure time differences with even higher accuracy, you may want to consider using: 1. **High-Resolution Timers**: Some browsers and platforms provide high-resolution timers that can offer more precise measurements than the built-in `Date` object. 2. **External Libraries**: Depending on your specific use case, external libraries like `performance-now` or `high-res-timer` might provide additional features and accuracy. Overall, this benchmark provides a simple yet effective way to compare two common approaches for measuring time differences in JavaScript, helping developers make informed decisions about which approach best suits their needs.
Related benchmarks
Date.now() vs new Date().getTime()
new Date().getTime() vs Date.now()
Date.now() vs new Date()
Comments
Confirm delete:
Do you really want to delete benchmark?