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Date.parse vs. new Date().getTime
(version: 1)
Comparing performance of:
new Date vs Date.parse
Created:
one year ago
by:
Guest
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Tests:
new Date
new Date("2025-04-25T20:06:55.673Z").getTime();
Date.parse
Date.parse("2025-04-25T20:06:55.673Z");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
new Date
Date.parse
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
Browser/OS:
Chrome 134 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=596990" width="100%" height="500px"></iframe>
Test name
Executions per second
new Date
8540829.0 Ops/sec
Date.parse
9669048.0 Ops/sec
Autogenerated LLM Summary
(model
gpt-4o-mini
, generated one year ago):
The benchmark described in the provided JSON compares two methods in JavaScript for parsing a date from a string and obtaining its corresponding timestamp: `Date.parse` and `new Date().getTime()`. Here's a breakdown of these approaches, including their pros and cons, and additional considerations. ### Methods Under Comparison 1. **`Date.parse()`** - **Benchmark Definition:** `Date.parse("2025-04-25T20:06:55.673Z");` - **Purpose:** This method takes a date string as input and converts it into the number of milliseconds since the Unix epoch (January 1, 1970, 00:00:00 UTC). It's designed specifically for parsing date-time strings. 2. **`new Date().getTime()`** - **Benchmark Definition:** `new Date("2025-04-25T20:06:55.673Z").getTime();` - **Purpose:** This approach first creates a `Date` object from the input string and then retrieves the time value using `.getTime()`. This too results in the number of milliseconds since the Unix epoch but involves the instantiation of a `Date` object. ### Performance Metrics The benchmark results display execution speed in terms of **Executions Per Second (EPS)**: - `Date.parse`: 9,669,048 executions per second - `new Date()`: 8,540,829 executions per second From these results, we observe that `Date.parse` appears to perform better in terms of execution speed. ### Pros and Cons #### `Date.parse` **Pros:** - Simplicity: It's a straightforward way to convert date strings to timestamps without needing to create a `Date` object first. - Faster performance in this benchmark, as demonstrated by the higher EPS. **Cons:** - Flexibility: `Date.parse` may have inconsistencies across different browsers and time zone formats, particularly for custom or non-ISO 8601 date formats. #### `new Date().getTime()` **Pros:** - Compatibility: Creates a `Date` object which can handle a wider range of date formats and perform additional date-related operations more smoothly. - Readability: Makes it clearer for someone reading the code that a date object is being created and used. **Cons:** - Overhead: The creation of a `Date` object introduces some overhead, which can affect performance, especially in scenarios involving many date-time conversions. ### Other Considerations - **Date Formats:** Both methods generally work well with ISO 8601 date strings, which is the format used in this benchmark. However, developers should be cautious with formats outside this norm as behavior may vary. - **Browser Variability:** While the benchmark results shown are from Chrome, performance can differ across browsers due to differences in their JavaScript engines. It's always a good idea to test these methods in the context of the intended target audience's browsers. ### Alternatives Other alternatives for date handling in JavaScript include: - **Libraries like Moment.js:** Historically popular for complex date manipulations, it has utility functions that facilitate parsing and formatting. However, it is now relatively heavy and often not recommended for new projects. - **Day.js:** A lightweight alternative with a similar API to Moment.js, making it a good choice for projects needing date manipulation without bloat. - **Date-fns:** A modular date utility library offering a wide range of functions for date manipulation, allowing developers to pick and choose functionalities while maintaining a lightweight build. Making an informed choice among these options depends on the specific use case requirements, performance considerations, and desired browser compatibility.
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