39 lines
1.2 KiB
Markdown
39 lines
1.2 KiB
Markdown
---
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title: Format duration
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type: snippet
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language: javascript
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tags: [date,math,string]
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cover: clock
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dateModified: 2020-10-22T20:23:47+03:00
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---
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Returns the human-readable format of the given number of milliseconds.
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- Divide `ms` with the appropriate values to obtain the appropriate values for `day`, `hour`, `minute`, `second` and `millisecond`.
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- Use `Object.entries()` with `Array.prototype.filter()` to keep only non-zero values.
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- Use `Array.prototype.map()` to create the string for each value, pluralizing appropriately.
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- Use `Array.prototype.join()` to combine the values into a string.
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```js
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const formatDuration = ms => {
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if (ms < 0) ms = -ms;
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const time = {
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day: Math.floor(ms / 86400000),
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hour: Math.floor(ms / 3600000) % 24,
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minute: Math.floor(ms / 60000) % 60,
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second: Math.floor(ms / 1000) % 60,
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millisecond: Math.floor(ms) % 1000
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};
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return Object.entries(time)
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.filter(val => val[1] !== 0)
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.map(([key, val]) => `${val} ${key}${val !== 1 ? 's' : ''}`)
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.join(', ');
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};
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```
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```js
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formatDuration(1001); // '1 second, 1 millisecond'
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formatDuration(34325055574);
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// '397 days, 6 hours, 44 minutes, 15 seconds, 574 milliseconds'
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```
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