Benchmark: new Date().getTimer() vs Date.parse()

Tests:

Date getTime
new Date('2022-08-31').getTime()
Parse
Date.parse('2022-08-31')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date getTime
Parse

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Date getTime	7865473.0 Ops/sec
Parse	9089645.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, the options compared, pros and cons of those approaches, and other considerations.

**Benchmark Definition**

The provided `Benchmark Definition` json represents two individual test cases:

```json
{
    "Name": "new Date().getTimer() vs Date.parse()",
    "Description": null,
    "Script Preparation Code": null,
    "Html Preparation Code": null
}
```

This benchmark is testing the performance difference between using `Date.getTime()` and `Date.parse()` methods in JavaScript.

**Individual Test Cases**

There are two test cases:

1. **"Date getTime"**
```json
{
    "Benchmark Definition": "new Date('2022-08-31').getTime()",
    "Test Name": "Date getTime"
}
```

This test case is comparing the performance of `Date.getTime()` method, which returns the number of milliseconds since the Unix Epoch (January 1, 1970).

2. **"Parse"**
```json
{
    "Benchmark Definition": "Date.parse('2022-08-31')",
    "Test Name": "Parse"
}
```

This test case is comparing the performance of `Date.parse()` method, which parses a string representing a date and returns the number of milliseconds since the Unix Epoch.

**Libraries and Special JS Features**

There are no specific libraries being used in these benchmark tests. However, it's worth noting that both methods rely on the JavaScript `Date` object, which is built-in to JavaScript.

**Pros and Cons of Different Approaches**

1. **`Date.getTime()`**
	* Pros:
		+ Returns a number of milliseconds since the Unix Epoch.
		+ Generally faster than `Date.parse()`.
	* Cons:
		+ Requires creating a new `Date` object using the constructor (`new Date()`).
2. **`Date.parse()`**
	* Pros:
		+ Does not require creating a new `Date` object.
	* Cons:
		+ Returns NaN (Not a Number) if the input string is invalid.
		+ Generally slower than `Date.getTime()`.

**Other Considerations**

When choosing between `Date.getTime()` and `Date.parse()`, consider the following:

1. **Performance**: If you need to perform date-related calculations frequently, using `Date.getTime()` might be a better choice due to its performance benefits.
2. **Input Validation**: If you're working with user input or external data that may not always be in the correct format, use `Date.parse()`. It allows for more flexible error handling.
3. **Code Readability and Maintainability**: If readability and maintainability are important, consider using `Date.getTime()` as it is more straightforward to understand.

**Alternatives**

If you're looking for alternative methods for date-related calculations or string parsing, consider the following:

1. **`moment.js`**: A popular JavaScript library for working with dates and times.
2. **`luxon.js`**: Another well-regarded JavaScript library for date and time manipulation.
3. **`Date.parse()`'s built-in alternatives**: Some browsers have implemented alternative methods for parsing dates, such as `Intl.DateTimeFormat().resolvedOptions().timeZone` (for determining the time zone).

Keep in mind that these alternatives may require additional setup and configuration.

I hope this explanation helps!

Related benchmarks:

new Date().getTimer() vs Date.parse() (version: 0)

Comparing performance of: Date getTime vs Parse

Created: 2 years ago by: Guest

Jump to the latest result

Date getTime

Parse

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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