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Create Date
(version: 0)
Comparing performance of:
new Date vs setTime vs Mod 24 Hours vs New Date set All
Created:
9 years ago
by:
Guest
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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);
New Date set All
var new1 = new Date(start.getFullYear(), start.getMonth(), start.getDate(), 0, 0, 0, 0); new1 = new1.getTime();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
new Date
setTime
Mod 24 Hours
New Date set All
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **Benchmark Purpose** The provided benchmark is designed to measure the performance of three different approaches for creating date objects in JavaScript: `new Date()`, `setTime()`, and manual calculation using `getTime()`. **Approach Options Compared** There are three main approaches compared: 1. **`new Date()`**: Creates a new date object directly from the current time. 2. **`setTime()`**: Sets the timestamp of an existing date object to the desired value. 3. **Manual Calculation**: Uses `getTime()` to extract the timestamp and then calculates the desired date by manipulating this value. **Pros and Cons** 1. **`new Date()`**: * Pros: Fast, easy to use, and creates a new object that can be manipulated independently of the original date. * Cons: May not account for edge cases, such as timezone differences or daylight saving time (DST) adjustments. 2. **`setTime()`**: * Pros: Allows fine-grained control over the timestamp and can handle more complex scenarios than `new Date()`. * Cons: Requires an existing date object, which may be unnecessary if only a timestamp is needed. Also, it doesn't account for DST or timezone differences. 3. **Manual Calculation**: * Pros: Provides complete control over the calculation, including handling DST and timezone differences. * Cons: More complex and error-prone than the other two approaches. **Library Usage** None of the benchmark tests use any external libraries. The `Date` object is a built-in JavaScript primitive. **Special JS Feature/Syntax** The test cases use the following special feature: * **`getTime()`**: Extracts the timestamp from a date object as a number, representing the number of milliseconds since January 1, 1970, 00:00:00 UTC. * **`setHours()`, `setMinutes()`, `setSeconds()`, and `setMilliseconds()`**: Set specific hours, minutes, seconds, and milliseconds for a date object. **Other Alternatives** If you need to create dates in JavaScript, there are other alternatives: 1. **Date.parse()**: Similar to `getTime()`, but it parses a string into a timestamp. 2. **Date.UTC()**: Creates a date object with the specified UTC timestamp. However, these alternatives are not used in this benchmark, as they involve additional steps and may not provide the same level of control as the manual calculation approach. I hope this explanation helps!
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