useDateNow

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JavaScript (and super languages)

Summary

Rule available since: v1.8.0
Diagnostic Category: lint/complexity/useDateNow
This rule is recommended, which means is enabled by default.
This rule has an unsafe fix.
The default severity of this rule is warning.
Sources:
- Same as unicorn/prefer-date-now

How to configure

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{
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  "linter": {
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    "rules": {
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      "complexity": {
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        "useDateNow": "error"
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      }
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    }
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  }
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}

Description

Use Date.now() to get the number of milliseconds since the Unix Epoch.

Date.now() is more readable than new Date().getTime() and its variants, it also avoids unnecessary instantiation of Date object.

Examples

Invalid

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const foo = new Date().getTime();

code-block.js:1:13 lint/complexity/useDateNow  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use Date.now() instead of new Date().getTime().
  
  > 1 │ const foo = new Date().getTime();
      │             ^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Date.now() is more readable and also avoids unnecessary instantiation of Date object.
  
  ℹ Unsafe fix: Replace with Date.now().
  
    1   │ - const·foo·=·new·Date().getTime();
      1 │ + const·foo·=·Date.now();
    2 2 │

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const foo = new Date().valueOf();

code-block.js:1:13 lint/complexity/useDateNow  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use Date.now() instead of new Date().valueOf().
  
  > 1 │ const foo = new Date().valueOf();
      │             ^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Date.now() is more readable and also avoids unnecessary instantiation of Date object.
  
  ℹ Unsafe fix: Replace with Date.now().
  
    1   │ - const·foo·=·new·Date().valueOf();
      1 │ + const·foo·=·Date.now();
    2 2 │

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const foo = +new Date();

code-block.js:1:13 lint/complexity/useDateNow  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use Date.now() instead of new Date().
  
  > 1 │ const foo = +new Date();
      │             ^^^^^^^^^^^
    2 │ 
  
  ℹ Date.now() is more readable and also avoids unnecessary instantiation of Date object.
  
  ℹ Unsafe fix: Replace with Date.now().
  
    1   │ - const·foo·=·+new·Date();
      1 │ + const·foo·=·Date.now();
    2 2 │

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const foo = Number(new Date());

code-block.js:1:13 lint/complexity/useDateNow  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use Date.now() instead of Number(new Date()).
  
  > 1 │ const foo = Number(new Date());
      │             ^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Date.now() is more readable and also avoids unnecessary instantiation of Date object.
  
  ℹ Unsafe fix: Replace with Date.now().
  
    1   │ - const·foo·=·Number(new·Date());
      1 │ + const·foo·=·Date.now();
    2 2 │

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const foo = new Date() * 2;

code-block.js:1:13 lint/complexity/useDateNow  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use Date.now() instead of new Date().
  
  > 1 │ const foo = new Date() * 2;
      │             ^^^^^^^^^^
    2 │ 
  
  ℹ Date.now() is more readable and also avoids unnecessary instantiation of Date object.
  
  ℹ Unsafe fix: Replace with Date.now().
  
    1   │ - const·foo·=·new·Date()·*·2;
      1 │ + const·foo·=·Date.now()*·2;
    2 2 │

Valid

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const foo = Date.now();

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const foo = Date.now() * 2;