Benchmark: Create Date - MeasureThat.net

Script Preparation code:

var start = new Date();
var temp1 = new Date();

Tests:

new Date
var new1 = new Date(start) new1.setHours(0,0,0,0); new1 = new1.getTime();
setTime
temp1.setTime(start.getTime()); temp1.setHours(0,0,0,0); var new1 = temp1.getTime();
Mod 24 Hours
var new1 = start.getTime() % (1000*60*60*24);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
new Date
setTime
Mod 24 Hours

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:48.0) Gecko/20100101 Firefox/48.0

Browser/OS: Firefox 48 on Windows 7

View result in a separate tab

Test name	Executions per second
new Date	2916980.8 Ops/sec
setTime	3976114.0 Ops/sec
Mod 24 Hours	99186856.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

The benchmark provided measures the performance of creating dates in different ways using the `Date` object in JavaScript. The benchmark consists of three test cases:

1. **new Date**: This test case creates a new date object and then sets its hours, minutes, seconds, and milliseconds to 0 using the `setHours`, `setMinutes`, `setSeconds`, and `setMilliseconds` methods respectively. It then retrieves the timestamp of this date in milliseconds using the `getTime` method.

2. **setTime**: This test case creates a temporary date object `temp1` by setting its time to the current time using the `setTime` method, which takes the timestamp as an argument. It then sets the hours, minutes, seconds, and milliseconds of `temp1` to 0. Finally, it retrieves the timestamp of this modified date in milliseconds.

3. **Mod 24 Hours**: This test case calculates a new date by taking the remainder of the current timestamp when divided by the number of milliseconds in a day (1000*60*60*24). It then converts this resulting value to a date object and returns its timestamp in milliseconds.

Now, let's discuss the pros and cons of each approach:

1. **new Date**: This method is straightforward but may have some overhead due to the additional steps involved in setting the hours, minutes, seconds, and milliseconds. However, it provides a clear and reliable way to create a date object.
2. **setTime**: This method is more efficient than creating a new date object from scratch because it avoids unnecessary calculations. However, it relies on modifying an existing temporary object, which might be less intuitive for some developers.
3. **Mod 24 Hours**: This method is the most lightweight and straightforward, as it only involves simple arithmetic operations. However, it may not provide the same level of precision as the other two methods.

As for libraries used in these benchmarks, none are explicitly mentioned. However, it's worth noting that some JavaScript implementations might have optimizations or built-in functions for date-related calculations.

Now, let's talk about special JS features and syntax:

None of the benchmarking code uses any special JavaScript features or syntax beyond the standard `Date` object.

Now, what are the alternatives?

Some alternative ways to create dates in JavaScript include:

* Using a library like Moment.js: This popular library provides a more intuitive API for working with dates and times.
* Utilizing modern date functions: Some newer versions of JavaScript provide additional date-related functions, such as `Date.now()` or `Date.parse()`, which might be useful in specific scenarios.

In conclusion, MeasureThat.net's benchmarking framework provides an excellent way to compare the performance of different approaches to creating dates in JavaScript. By understanding the pros and cons of each method, developers can choose the most efficient approach for their specific use case.

Related benchmarks:

Create Date (version: 0)

Comparing performance of: new Date vs setTime vs Mod 24 Hours

Created: 8 years ago by: Guest

Jump to the latest result

new Date

setTime

Mod 24 Hours

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):