Benchmark: Create Date - MeasureThat.net

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
New
Reuse
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 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser/OS: Chrome 53 on Mac OS X 10.10.3

View result in a separate tab

Test name	Executions per second
New	1905114.8 Ops/sec
Reuse	1906853.4 Ops/sec
Mod 24 hours	2736142.8 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 provided JSON represents a benchmark test case, which is designed to measure the performance of creating and manipulating Date objects in JavaScript.

**Script Preparation Code:**
```javascript
var start = new Date();
var temp1 = new Date();
```
This code snippet initializes two Date objects, `start` and `temp1`, before running the actual benchmark tests. The `start` object is used as a reference point for all subsequent test cases.

**Html Preparation Code:**
There is no HTML preparation code provided in this example.

**Individual Test Cases:**

The benchmark consists of three test cases, each with its own script:

### 1. "New"
```javascript
var new1 = new Date(start)
new1.setHours(0,0,0,0);
new1 = new1.getTime();
```
This test case creates a new Date object (`new1`) from the `start` object and then converts it to a Unix timestamp using the `getTime()` method.

**Pros:**

* Simple and straightforward approach
* No overhead of reusing an existing Date object

**Cons:**

* Creates a new Date object every time, which can be expensive in terms of performance

### 2. "Reuse"
```javascript
temp1.setTime(start.getTime());
temp1.setHours(0,0,0,0);
var new1 = temp1.getTime();
```
This test case reuses the existing `temp1` Date object by setting its timestamp using `setTime()` and then converting it to a Unix timestamp.

**Pros:**

* Reuses an existing Date object, which can be faster than creating a new one
* Reduces memory allocation overhead

**Cons:**

* Modifies an existing object, which might not be desirable in some scenarios
* Requires careful consideration of the impact on the original object's state

### 3. "Mod 24 hours"
```javascript
var new1 = new Date(start);
new1 = new1.getTime() % (1000*60*60*24);
```
This test case creates a new Date object (`new1`) from the `start` object and then takes the timestamp modulo 24 hours.

**Pros:**

* Simplifies the calculation by removing unnecessary parts of the timestamp
* Reduces the number of operations required

**Cons:**

* May not be suitable for all use cases, as it modifies the original timestamp

**Library Usage:**
There is no explicit library usage in this benchmark. However, some JavaScript engines may provide built-in methods or optimizations that affect the performance of Date object manipulation.

**Special JS Features/Syntax:**
None mentioned explicitly.

**Other Considerations:**

* The benchmark results show varying execution per second values for each test case, indicating different performance characteristics.
* The device platform and operating system used to run the benchmarks may impact performance due to differences in hardware and software capabilities.

**Alternative Approaches:**

* Using `Date.now()` instead of `getTime()` or `setTime()`
* Using a library like Moment.js for date manipulation
* Implementing custom date algorithms using bitwise operations or other techniques
* Profile-guided optimization (PGO) to identify performance bottlenecks and optimize the code accordingly

Keep in mind that these alternatives may not be relevant or suitable for every JavaScript engine, version, or use case.

Related benchmarks:

Create Date (version: 0)

Comparing performance of: New vs Reuse vs Mod 24 hours

Created: 8 years ago by: Guest

Jump to the latest result

New

Reuse

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):