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# ms
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[](https://travis-ci.org/zeit/ms)
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[](https://spectrum.chat/zeit)
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Use this package to easily convert various time formats to milliseconds.
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## Examples
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```js
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ms('2 days') // 172800000
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ms('1d') // 86400000
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ms('10h') // 36000000
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ms('2.5 hrs') // 9000000
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ms('2h') // 7200000
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ms('1m') // 60000
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ms('5s') // 5000
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ms('1y') // 31557600000
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ms('100') // 100
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ms('-3 days') // -259200000
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ms('-1h') // -3600000
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ms('-200') // -200
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```
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### Convert from Milliseconds
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```js
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ms(60000) // "1m"
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ms(2 * 60000) // "2m"
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ms(-3 * 60000) // "-3m"
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ms(ms('10 hours')) // "10h"
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```
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### Time Format Written-Out
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```js
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ms(60000, { long: true }) // "1 minute"
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ms(2 * 60000, { long: true }) // "2 minutes"
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ms(-3 * 60000, { long: true }) // "-3 minutes"
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ms(ms('10 hours'), { long: true }) // "10 hours"
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```
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## Features
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- Works both in [Node.js](https://nodejs.org) and in the browser
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- If a number is supplied to `ms`, a string with a unit is returned
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- If a string that contains the number is supplied, it returns it as a number (e.g.: it returns `100` for `'100'`)
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- If you pass a string with a number and a valid unit, the number of equivalent milliseconds is returned
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## Related Packages
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- [ms.macro](https://github.com/knpwrs/ms.macro) - Run `ms` as a macro at build-time.
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## Caught a Bug?
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1. [Fork](https://help.github.com/articles/fork-a-repo/) this repository to your own GitHub account and then [clone](https://help.github.com/articles/cloning-a-repository/) it to your local device
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2. Link the package to the global module directory: `npm link`
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3. Within the module you want to test your local development instance of ms, just link it to the dependencies: `npm link ms`. Instead of the default one from npm, Node.js will now use your clone of ms!
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As always, you can run the tests using: `npm test`
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