ms

A tiny (414B) and fast utility to convert milliseconds to and from strings.

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NOTICE: This is a fork of vercel/ms!
In June 2019, I opened a PR with signficiant performance and code size improvements. After nearly 2 years of silence, it was eventually closed. :cry: A year into my wait, I started anew (this repo), hoping to improve upon my own improvements.

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This module is delivered as:

• CommonJS: dist/index.js
• ES Module: dist/index.mjs
• UMD: dist/index.min.js

Install

$ npm install --save @lukeed/ms

Usage

1import { parse, format } from '@lukeed/ms';
2
3// string => number
4parse('2 days');   //=> 172800000
5parse('1d');       //=> 86400000
6parse('10h');      //=> 36000000
7parse('2.5 hrs');  //=> 9000000
8parse('2h');       //=> 7200000
9parse('1m');       //=> 60000
10parse('5s');       //=> 5000
11parse('1y');       //=> 31557600000
12parse('100');      //=> 100
13parse('-3 days');  //=> -259200000
14parse('-1h');      //=> -3600000
15parse('-200');     //=> -200
16
17// number => string
18format(60000);             //=> '1m'
19format(2 * 60000);         //=> '2m'
20format(-3 * 60000);        //=> '-3m'
21format(parse('10 hours')); //=> '10h'
22
23// number => string (long)
24format(60000, true);             //=> '1 minute'
25format(2 * 60000, true);         //=> '2 minutes'
26format(-3 * 60000, true);        //=> '-3 minutes'
27format(parse('10 hours'), true); //=> '10 hours'

API

ms.parse(input)

Returns: Number

Parses the input string, returning the number of milliseconds.

input

Type: String

The human-readable time string; eg: 10min, 10m, 10 minutes.

ms.format(milli, long?)

Returns: Number

Formats the millisecond count to a human-readable time string.

Important: The output will be rounded to the nearest whole integer.

milli

Type: Number

The number of milliseconds.

long

Type: Boolean
Default: false

Whether or not the output should use the interval's long/full form; eg hour or hours instead of h.

Note: When long, the count and interval will be separated by a single space.
Also, when long, the interval may be pluralized; eg 1 second vs 2 seconds.

Benchmarks

Running on Node.js v12.18.4

Validation :: parse
  ✔ lukeed/ms
  ✔ zeit/ms

Benchmark :: "parse"
  lukeed/ms      x 351,319 ops/sec ±0.31% (96 runs sampled)
  zeit/ms        x 245,576 ops/sec ±1.66% (94 runs sampled)

Benchmark :: "parse" (long)
  lukeed/ms      x 335,538 ops/sec ±0.50% (94 runs sampled)
  zeit/ms        x 265,410 ops/sec ±1.72% (95 runs sampled)


Validation :: format
  ✔ lukeed/ms
  ✔ zeit/ms

Benchmark :: "format"
  lukeed/ms      x 4,109,440 ops/sec ±0.35% (94 runs sampled)
  zeit/ms        x 3,420,198 ops/sec ±1.61% (94 runs sampled)

Benchmark :: "format" (long)
  lukeed/ms      x 3,402,872 ops/sec ±0.14% (97 runs sampled)
  zeit/ms        x 1,344,908 ops/sec ±3.68% (96 runs sampled)

Credits

This is obviously a fork of zeit/ms.

I opened a PR in June 2019 that introduced significant performance gains and code reduction — it was ignored for nearly two years. This repository is a from-scratch re-implementation that takes the goals of that PR a bit further.

License

MIT © Luke Edwards